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Contact: Wang Lili
E-mail：18066002268
Phone：702461526@qq.com
Address: Lifute Industrial Park, Taizhou City, Jiangsu Province
Lift Sling Rigging Co., Ltd. manufactures the white acid-resistant and alkali-resistant sling - a flat woven webbing sling to EN 1492-1, made to order from 1 t to 10 t, for the plant that runs an acid stage and an alkali stage rather than only one of them. The webbing is supplied white at the customer‘s request, because white webbing protects the load by preventing colour transfer and because contamination shows up on it early; capacity is then carried by the black capacity stripe count, one stripe per tonne, and by the identification label, since white is not one of the capacity colours in the EN 1492-1 sequence. Woven from polypropylene, which is unaffected by acids and by alkalis both, and which takes up below 0.1% of its own weight in water so a wet band carries its dry rating. 7:1 safety factor and a minimum breaking load of seven times the working load limit, single or double ply, any length from 1 m to 12 m, edge protection and UV-stabilised webbing on request. Keep it clear of chlorinated solvents, aromatic hydrocarbons and strong oxidising acids, and below +80 C. HS code 630790. Phone 18066002268.
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Release time：2026-09-17 09:10
Lift Sling Rigging Co., Ltd. +8618066002268 produces White acid-resistant and alkali-resistant sling, white acid-washed sling, acid-resistant and alkali-resistant nylon sling。
White Acid-Resistant and Alkali-Resistant Sling
White acid-resistant and alkali-resistant sling — white polypropylene webbing to EN 1492-1, 1 t to 10 t, for lines that run an acid stage and an alkali stage, single or double ply, any length from 1 m to 12 m
What is on this page. This page covers the white two-stage sling as a product and as a specification decision: what it is and what it is not, the band range and how a white band carries its capacity, why white is specified and what it costs, the two-stage duty that makes the product necessary, how to fill in the enquiry for a line rather than a tank, what the whitened webbing changes in service and what it does not, how to inspect it, and what the rulebooks say about a sling that meets both chemistries.
- What the product is, and the four things it gets confused with — section 1
- The white band range and how capacity is read on a white band — section 2
- Why white, what it buys and what it costs — section 3
- The two-stage duty: acid and alkali under one crane — section 4
- Choosing fibre, band and form for the line — section 5
- White webbing in service: wet, hot, sunlit and chemically loaded — section 6
- Inspection and retirement criteria for a white band — section 7
- Marking, traceability and the colour question — section 8
- Standards and the regulatory position on a combined-duty sling — section 9
- How to order: the line checklist — section 10
1. What a White Acid-Resistant and Alkali-Resistant Sling Is
A white acid-resistant and alkali-resistant sling is a flat woven webbing sling woven from polypropylene, sewn into an endless loop or an eye-and-eye form, and supplied with white webbing. EN 1492-1 covers flat woven webbing slings in Type A (endless), Type B, Type C and Type D across webbing widths of 25 mm to 450 mm in polyamide, polyester or polypropylene, and the product on this page sits inside that standard at a safety factor of 7:1. The name of the product describes the duty, not the fibre: it is bought by a plant whose parts or materials pass through an acid bath and a caustic bath on the same production line, and who wants one sling material that survives both ends of the cycle.
White is a specification decision with a consequence, and both halves of that sentence matter. White webbing is asked for because it protects the load and because it shows contamination early, and both of those are real operational benefits. But white is also outside the capacity colour sequence that EN 1492-1 uses for the band, so a white sling loses the fastest capacity cue there is. Section 3 sets out the trade honestly, and section 8 sets out how we mark a white band so that nothing is actually lost in practice.
Four other products are regularly quoted as if they were this one.
Terminology: what the term in the quotation actually means
| Term you may be offered | What it actually is | Standard | Covered on this page? |
|---|---|---|---|
| White acid-resistant and alkali-resistant sling | Flat woven polypropylene webbing, supplied white, for a line that runs an acid stage and an alkali stage | EN 1492-1 | Yes — this page |
| White acid and alkali resistant flat sling | The same product, named by construction instead of by industry usage | EN 1492-1 | Yes — this page |
| White pickling sling, pickling line sling | The same product named by the process it works in; most pickling enquiries arrive under this term | EN 1492-1 | Yes — section 4 |
| White polypropylene flat lifting belt, white double-ear sling | The same white polypropylene construction supplied as a double-eye form rather than an endless loop | EN 1492-1 | White acid-alkali double-ear sling |
| White one-way sling, single-use sling, disposable sling | A different product and a different risk. A consumable built to DIN 60005 or similar, normally rated no higher than 1,000 kg at 4:1 or 5:1, permitted one trip and then destroyed. It is white because it is cheap, not because of the load | DIN 60005 / ISO 4878 | No — see the warning below |
| White nylon sling, white acid-resistant nylon sling | A contradiction in terms. Polyamide is attacked by acids; a sling that resists alkali is not the sling that resists acid | EN 1492-1 | No — the fibre is wrong |
| White round sling, white braided sling, rond sling | A round sling: a load-bearing yarn core inside a woven tubular cover, under a different standard and a different construction | EN 1492-2 | No — a different product |
2. The White Band Range, 1 t to 10 t
The band structure is the same as the rest of the flat woven range, because the band is set by the standard and not by the colour or the fibre. What changes on a white band is how the capacity is communicated. On a coloured band the webbing colour is the first signal and the black stripes repeat it; on a white band the colour carries no capacity information at all, so the stripe count and the label carry the whole message.
What each mark on a white sling tells you
| The mark you are looking at | What it tells you | Set by | On a white band |
|---|---|---|---|
| Webbing colour (white) | Nothing about capacity. White sits outside the capacity colour sequence | Customer requirement | No capacity information — the reason the stripes and label matter more here |
| Black transverse stripes | The working load limit for a straight lift, one stripe per tonne | EN 1492-1 | The primary capacity cue on this product — count them |
| Label colour | The fibre the sling is woven from, not the capacity | EN 1492-1 fibre identification | Brown, because the fibre is polypropylene. On a white band the label is also the only place the capacity is written in words and figures |
| Label data | Working load limit, fibre, standard, length, traceability code | EN 1492-1 | Read the label, not the webbing, on a white sling |
| Printed logo or customer colour | Nothing about capacity | The buyer | May be added alongside the required marks, never instead of them |
The table below is the white sling specification as we build it. Band, breaking load and hitch factors are identical to the coloured bands in the same range, because they are set by the standard; the difference is the webbing colour and the fact that capacity is read from the stripes and the label.
White acid-resistant and alkali-resistant sling: band specification, 1 t to 10 t
| Band | Black stripes on the white webbing | Working load limit, straight lift | Minimum breaking load at 7:1 | Choked hitch (0.8) | Basket, parts parallel (2.0) | Two-leg assembly (1.4) |
|---|---|---|---|---|---|---|
| 1 t | 1 stripe | 1 t / 1,000 kg / 2,205 lb | 7 t | 0.8 t | 2 t | 1.4 t |
| 2 t | 2 stripes | 2 t / 2,000 kg / 4,409 lb | 14 t | 1.6 t | 4 t | 2.8 t |
| 3 t | 3 stripes | 3 t / 3,000 kg / 6,614 lb | 21 t | 2.4 t | 6 t | 4.2 t |
| 4 t | 4 stripes | 4 t / 4,000 kg / 8,818 lb | 28 t | 3.2 t | 8 t | 5.6 t |
| 5 t | 5 stripes | 5 t / 5,000 kg / 11,023 lb | 35 t | 4.0 t | 10 t | 7.0 t |
| 6 t | 6 stripes | 6 t / 6,000 kg / 13,228 lb | 42 t | 4.8 t | 12 t | 8.4 t |
| 8 t | 8 stripes | 8 t / 8,000 kg / 17,637 lb | 56 t | 6.4 t | 16 t | 11.2 t |
| 10 t | 10 stripes | 10 t / 10,000 kg / 22,046 lb | 70 t | 8.0 t | 20 t | 14.0 t |
How to read the white band table.
- Count the stripes, then read the label. On a white band there is no colour shortcut, so the stripe count is the working figure and the label repeats it in words and figures. That makes a legible label a safety item on this product rather than a formality: a white sling whose label has been destroyed by a splash cannot be identified by looking at it.
- One black stripe per tonne, on white webbing. The stripes are printed dark and are read against the white ground, which is one small practical advantage of the light band: they are unusually easy to count, provided they have not been stained over. A stripe count you cannot read is a sling you cannot use.
- There is no wet figure to apply. Polypropylene takes up below 0.1% of its own weight in water, so the figures above hold on a damp band as well as a dry one — which is the normal condition on a line with rinse tanks.
- Breaking loads are destruction figures. 7 t at the 1 t band and 70 t at the 10 t band are minimum breaking loads at the EN 1492-1 factor of 7:1, never working capacities and never a margin to spend.
- Above 10 t, and outside the flat range. Heavier flat woven slings are made to order; for very heavy lifts a round sling, a wire rope sling or a lifting beam is usually the better answer, and we will say so if the number points that way.
3. Why White? What the Colour Is For, and What It Costs You
White webbing is a functional choice, and there are two reasons for it that survive scrutiny. It is worth separating them from the reasons that do not, because the second kind is where a buyer ends up paying for white and getting nothing.
The white reason, what it buys, and what it costs
| Reason for white | What it actually buys | What it costs | Our view |
|---|---|---|---|
| Colour transfer to the load | A coloured sling can mark the material it is wrapped around. Published sling-manufacturer data gives this as a designed property of white webbing: white pile yarns are used to prevent colour transfer to the load | Nothing operational. It is a load-protection feature, not a compromise | Strong reason. Stands up for finished, painted, polished, galvanised or coated work, and for any load where a dye mark is a reject |
| Contamination and chemical attack are visible | Staining, dried salts, bleed marks, glazing and the beginnings of chemical attack are easier to see on a light ground than on a dark one, and published industry guidance is consistent that contamination and chemical exposure are among the things an inspection has to catch | White shows ordinary workshop dirt too, so a white band looks worse than it is and needs cleaning more often to stay legible | Strong reason on a chemical line, where the inspection question is always what has this band been in |
| A plant standard colour | Consistency with the customer's own colour scheme or with parts already in the rigging store | See the identification cost below, with no offsetting benefit | Acceptable if the plant genuinely needs one colour across a store, but it should be a conscious decision |
| White looks cleaner, or more food-safe | Nothing. White webbing is not a hygiene certification, not a food-contact approval and not a statement about the fibre. On a sling it is a colour | The identification cost below, paid for nothing | Not a reason. If the duty needs a food-contact or hygiene specification, that is a different conversation about materials and certification |
| White because it is the cheap one-way colour | Nothing. In this market white is the conventional colour of a single-trip consumable, and buying white in the expectation of a consumable price gets you a re-usable band at a re-usable price | A specification mismatch: a 7:1 band used as though it were disposable | Not a reason, and a warning — see section 1 |
What white costs you, stated plainly. The capacity colour sequence exists because a rigger can identify a sling's working load limit at a glance, before reading anything. A white band has no place in that sequence, so on this product the working load limit is carried by the stripe count and by the label. That is a genuine reduction in the redundancy of the marking, and it has one hard consequence: a white sling whose label is missing or illegible is out of service even if the webbing is perfect, and a stripe count obscured by staining is the same problem. We mark white bands accordingly:
- Every white band carries its stripe count in the standard way, one dark stripe per tonne, high-contrast against the white ground.
- Every white band carries a legible label stating the working load limit in words and figures, the fibre, the standard, the length and the traceability code.
- Where a customer wants the standard capacity colour instead, we supply the code colour on the same construction. The white band is a customer requirement, not a manufacturing preference, and it is quoted as a deviation so that nobody discovers it at goods-in.
- We do not ink, paint or dye a white band to imitate a capacity colour. Published sling guidance is explicit that paint should not be used to colour-code webbing, because the solvents in the paint can corrode the synthetic material. A white band marked on site with a colour is a white band put out of service by a marker pen.
4. The Two-Stage Duty: Acid and Alkali Under One Crane
This product exists because of the way a finishing line is built. Parts or material are cleaned before they are treated, so the same crane takes them through a caustic or alkaline stage first and an acid stage afterwards — degrease then pickle, clean then etch, alkaline clean then plate. Somewhere on that route is a rinse tank, and at the end of it may be a further acid step that is a different kind of acid altogether. A sling that works the whole route meets both chemistries, the rinse water between them, and the vapours above every tank.
The table separates the stages, because the answer is not the same at each one.
Stage by stage: what a finishing line asks of a sling
| Stage | What the sling meets | The fibre position | What to watch |
|---|---|---|---|
| Alkaline or caustic degrease, soak clean | Hot caustic or alkaline cleaner, usually with a surfactant package | Fibre fine: polypropylene is unaffected by alkalis, and polyester is the fibre caustic attacks | The rulebook, not the fibre, is the issue. In the US market the sling rule prohibits polyester and polypropylene web slings where fumes, vapours, sprays, mists or liquids of caustics are present — see section 9 |
| Acid pickle, hydrochloric or sulfuric | Warm mineral acid at working strength, with acid mist above the tank | Polypropylene unaffected. Polyamide is attacked by acids, and its use where acids are present is prohibited in the US market | Mist above a warm tank is exposure. Rinse and dry after the shift, and inspect the fittings as closely as the webbing |
| Rinse, neutralise and phosphate stages | Water, then dilute chemistry | Polypropylene. No wet derating applies to this fibre | The band stays at its dry rating through the whole sequence, but dry it before storage so that dried chemistry and grit are visible |
| Passivation and stainless pickling | Nitric acid, often with hydrofluoric acid — a strong oxidising bath | Not polypropylene. Strong oxidising acids are the one acid family that attacks it | The trap on a two-stage line: the sling that is right for the hydrochloric bath is wrong for the nitric bath, and both may be under the same crane |
| Chromic acid, conversion coating, light-metal pickling | Chromic acid and other strong oxidisers | Not polypropylene | Colour-code or tag the stages in the rigging store so that the acid sling and the oxidising-bath sling cannot be swapped |
| Electroplating and anodising | Acid and alkaline dips, drips, and mist above the line | Polypropylene for the acid and neutral stages | Published guidance is consistent that chemical exposure includes solids, liquids, vapours and fumes, so mist and vapour count as exposure rather than background |
| Pulp, paper and general caustic duty | Caustic soda and other alkalis | Fibre fine; market rule applies as above | Hot caustic is harder on the sling than cold, and evaporating solutions concentrate. Send the temperature, not just the chemical |
| Acid and alkaline effluent, waste treatment | Alternating or mixed, often uncontrolled | Ask before you order | Mixed or unknown chemistry is the one duty this page deliberately does not answer from a table. Send the tank list |
| Chemical plant general duty | Acids, alkalis, and often solvents and aromatics in the same building | Polypropylene for the acid and alkali; check the solvent list | Chlorinated solvents and aromatics attack polypropylene. A band that is right over an acid tank can be wrong ten metres away at a degreasing bath |
| Vapour, mist and fumes above any of the above | The airborne fraction of the same chemistry | The chemistry does not change because it is airborne | Treat fumes as exposure, because the published guidance does. A sling parked above a tank is in the chemistry |
One sling or two? This is the decision the page exists for, and it has an honest answer. On the fibre alone, polypropylene covers the whole cycle: it is unaffected by acids and by alkalis both, which is why it is the material behind this product. On the rulebook, the position is different and depends on where the sling is used. In the US market, the sling rule prohibits polyamide web slings where acids are present and prohibits polyester and polypropylene web slings where caustics are present. Those two prohibitions cannot both be satisfied by one web sling material, so a US two-stage line is normally handled one of two ways: a dedicated sling for each stage, identified so that they cannot be swapped, or one white band with the stages it may enter documented and the exposure controlled. Tell us the market on the enquiry and we will quote to the rule that applies to you, because the same sling is a straightforward answer in one market and a documented decision in another.
5. Choosing Fibre, Band and Form for the Line
Three decisions are being made at once: the fibre, decided by the chemistry; the band, decided by the load and the hitch; and the form, decided by how the rigger has to use it. The table is organised the way two-stage enquiries actually arrive — by the stage pair.
Selection by the stage pair in front of you
| The duty in front of you | Fibre we would quote | Why that fibre | Where to go |
|---|---|---|---|
| Caustic degrease followed by an acid pickle | White polypropylene band, with the market rule checked | The only common fibre unaffected by both stages; white where the load must not be marked or the line must show contamination | This page, sections 3 and 4 |
| Acid pickle only | Polypropylene | Unaffected by mineral acids; the simplest answer of the three | Polypropylene flat sling |
| Caustic or alkaline duty only | Polyamide | Polyamide is essentially immune to alkali damage and needs no caustic exception; polypropylene is also fine on the fibre, so the choice is usually decided by strength and stretch | Nylon woven flat sling |
| Nitric, chromic or nitric-hydrofluoric bath, stainless pickle or passivation | Not polypropylene — ask us first | Strong oxidising acids attack polypropylene. The fibre that resists hydrochloric acid is not automatically right here | This page, section 4 |
| Parts that must not be marked by the sling | White webbing, any of the three fibres | White pile yarns prevent colour transfer to the load, which is the load-protection case for white | This page, section 3 |
| A line where contamination must be seen early | White webbing, any of the three fibres | Staining and chemical attack are easier to catch on a light ground, so the inspection is more likely to work | This page, sections 6 and 7 |
| A degreasing bath with chlorinated solvents anywhere on the line | Not polypropylene — separate the slings | Polypropylene softens in chlorinated solvents; the acid tank and the solvent bath need different bands | Polyester endless sling range |
| Elevated loads where stretch must stay small | Polyester | The lowest stretch of the three, and the most UV-stable, at the cost of the caustic tolerance | Endless webbing sling range |
| Mixed or unknown chemistry across several tanks | Ask before you order | Chemical resistance is not a property of the product; it is a property of a fibre against a named chemical at a named concentration and temperature | This page, section 10 |
The form: endless or eye-and-eye.
Endless against eye-and-eye on a two-stage line
| Endless white sling (Type A) | Eye-and-eye white sling (Type B, C or D) | |
|---|---|---|
| End fittings | None | None in Type B and C; metal fittings in Type D |
| Wear | The loop rotates, so wear keeps moving round the band | The same two eyes take every lift, so wear concentrates at the reinforcement |
| Length basis | Loop circumference | Bearing point to bearing point, laid flat |
| On a line with both chemistries | Usually the better answer: a band that has been over the caustic tank can be rotated so that the part which held the chemistry moves out of the load path | Used where the rig needs a hookable end; then the fitting material has to be chosen for the chemistry as carefully as the fibre |
| On fittings specifically | No metal in the load path, which removes one problem on an acid line entirely | Aluminium is severely degraded by alkali, caustic environments, acids and salt water, and the US rule separately prohibits aluminium fittings where caustics are present |
| On a white band specifically | Rotation also spreads the staining and the abrasion, so the stripes stay legible longer | Inspect the two eyes every time, because that is where the chemistry collects |
Five rules that decide the band, once the fibre is settled.
- Count the stages, not the tanks. A sling that crosses a caustic stage and an acid stage carries the chemistry of both on the same band, and in some markets the two prohibitions cannot both be satisfied by one material. Decide how many slings the line needs before deciding the band.
- Choking costs you 20% of the rating. A choked lift uses a mode factor of 0.8, so a 3 t band gives 2.4 t choked. On a finishing line a bundle of pipe or a rack of parts almost always has to be choked, so choose the band on the choked figure.
- An assembly is never the sum of its slings. Two legs within 45 degrees of vertical are rated at 1.4 times the single rating, and a four-leg assembly at 2.1, because a four-leg assembly is rated as if only three legs carry the load.
- An off-centre load puts more on one sling. Two slings share equally only when the centre of gravity sits exactly halfway between the pick points; move it a third of the way towards one pick point and that sling carries 67% of the load.
- Curvature is part of the rating, not a detail. Published guidance lists diameter of curvature over which the sling is used among the things the rated load is based on, along with hitch type and angle. A wide white band wrapped round a small diameter pipe is not doing the same job as the same band in a straight lift, and the answer is more bearing area or a different hitch rather than a heavier band.
6. White Webbing in Service: Wet, Hot, Sunlit and Chemically Loaded
White changes one thing in service and leaves the rest alone. The fibre behaves exactly as any polypropylene band behaves, so the technical limits below are the fibre's; what white changes is what you can see — and, in one case, what you cannot see, which is the point most easily missed on a light band.
White polypropylene in service: what the condition does, and what to do about it
| Condition | What it does to the band | What we recommend |
|---|---|---|
| Wet: rain, hose-down, rinse tank, or a caustic stage next to an acid one | Nothing. Polypropylene takes up below 0.1% of its own weight in water, so a wet band carries its dry rating and there is no wet figure to derate against | Plan the lift on the figure on the label, wet or dry. Dry the band before storage so that dried chemistry and grit are visible on the white webbing at the next inspection |
| Immersion, or permanently damp service | The fibre does not absorb water and is lighter than water, so it floats. Immersion is not a strength problem, but it concentrates chemistry inside the weave as it dries | Rinse in clean water, dry naturally, and say on the enquiry whether the sling is dipped into the tank or only crosses above it |
| Staining, soiling and dried salts | The white-specific condition. Staining is what you bought, in the sense that it makes exposure visible — but a band that is uniformly dirty shows nothing, and staining over a stripe count makes the capacity unreadable | Wash with mild soap and water and dry naturally. Never use a solvent, and never clean a stripe away. A band whose stripes cannot be counted is out of service regardless of its condition |
| Heat and hot tanks | EN 1492-1 gives polypropylene a use and storage range of −40 °C to +80 °C, the lowest ceiling in the flat woven range, with a softening point near 150 °C. Finishing lines are warm | Measure the tank, rinse and dryer temperatures the sling actually sees, not the air temperature. Keep the band clear of hot surfaces and of welding and plasma work nearby |
| Cold and frost | Serviceable to the low end of its range, but the most prone of the three to going stiff and more brittle as it cools | −40 °C is the lower bound. Inspect a frozen band for stiffness and surface cracking, and clear ice off it: ice cuts and abrades |
| Sunlight, UV, and arc welding nearby | The poorest UV resistance of the three fibres, and the worst case for inspection: a white band does not visibly fade, so the usual colour cue for UV damage is missing. Published sling guidance notes that slings become bleached and stiff when exposed to sunlight or arc welding | Buy UV-stabilised webbing for anything outdoors or near a window, park bands out of direct sun, and judge a white band by feel rather than by colour — stiffness is the signal, not fading |
| Acid mist above a warm pickle tank | The fibre is unaffected. The vapour is exposure all the same: published guidance is consistent that chemical degradation includes exposure in the form of vapours and fumes | This is the duty the product is bought for. Rinse and dry after the shift, and inspect the fittings, the stitching and the label rather than only the webbing |
| Alkali mist, spray and hot caustic splash | The fibre is unaffected by alkalis; the regulatory position is a separate question in some markets | Do not park the band above a caustic tank. Tell us the market so that the rulebook question in section 9 is answered before you buy |
| Strong oxidising acid: nitric, chromic, or a stainless pickle | Attacked. Oxidisers are the exception to the sentence that polypropylene resists acid | Withdraw the band immediately and inspect the whole assembly. If the line runs both a hydrochloric bath and a nitric stage, the stages need different slings |
| Chlorinated solvents, aromatics, tar and paint | Polypropylene softens or swells in chlorinated solvents and is attacked by aromatics; published polymer data is consistent that it should not be used in contact with strong oxidising acids, chlorinated hydrocarbons and aromatics | Keep the white band away from degreasing baths, paint and solvent vapour. A band bought for an acid line and then used to pull a load out of a degreasing tank is the classic misuse of this product |
| Abrasion: scale, grit, tank edges, dried solids, metal shavings | The wear that actually retires these bands. Polypropylene is the most abrasion-prone of the three lifting fibres, and one published note specifically warns that metal shavings cut through polypropylene bands | Sleeve or pad every edge the band crosses, rotate the band between lifts, and wash dried solids out of the weave. Budget for replacement on abrasion rather than on chemistry |
| Crush and pinch between the load and a hard surface | A white band shows a crush mark as a local flattening and often as a permanent crease, which is easier to see than on a dark band | Do not rest loads on the sling, and do not pull a sling from under a load resting on it. Both are among the standard operating prohibitions |
| Stored in a dark bag, damp, with chemistry in the weave | A storage failure rather than a lifting failure, and the white band makes it visible, which is the point | Dry naturally, store dark, dry and off the floor, away from oil, chemicals and sharp edges |
7. Inspection and Retirement Criteria for a White Band
Every sling should be inspected before every use, with a documented periodic inspection on top of that, and published guidance suggests yearly for normal service and monthly to quarterly for severe service. On a white band two things are different from a coloured one: more damage is visible, because staining and chemical attack show on a light ground, and one kind of damage is invisible, because a white band does not fade, so UV degradation has to be found by feel. The withdrawal list below is the one we work to.
White acid-resistant and alkali-resistant sling: what to check, and when to withdraw
| What to look at | Withdraw the sling if | Why it matters on this product specifically |
|---|---|---|
| Black stripe count against the label | The stripes cannot be counted, or the count disagrees with the label | On a coloured band the colour is a second, independent capacity cue. On a white band the stripes and the label are the whole message, so a stained or obscured stripe count is a capacity failure, not a cosmetic one |
| Identification label | Missing, illegible, or the working load limit, fibre, standard, length or traceability code cannot be read | Listed as a removal condition in published guidance, and it bites hardest here: on a white sling the label is the only place the capacity is written in words and figures |
| Staining, dried salts and residues | Staining that hides the weave, dried solids worked into the band, or any residue you cannot identify | The white band shows exposure early, which is why it was bought — but a band that is uniformly dirty has lost that advantage. Rinse, dry, re-inspect, and if the mark remains, treat it as chemical attack |
| Acid or caustic burns | Localised discoloration, glazing, hardening, or a bleached or eaten patch | Acid or caustic burns are a named removal condition in the regulation and in published guidance, and on a two-stage line the burn usually happens where the band crossed between the tanks |
| Stiffness and feel | A noticeable stiffening, a hard or brittle feel, or a powdery surface | This is the primary UV and heat signal on a white band, because the colour-fade cue that works on a coloured band is absent. Judge it in the hand, not by eye |
| Glazing, melting or scorch marks | Any glazed, melted or scorched area, or evidence of weld or plasma spatter | Polypropylene has the lowest heat ceiling in the range at +80 °C, and published guidance lists melting or charring of any part of the sling as a removal condition |
| Abrasion and surface condition | A flattened or glazed surface, a thinned or feathered selvedge, visible loss of weave definition, or damage reaching about 10% of the webbing width in any transverse section | Polypropylene is the most abrasion-prone of the three lifting fibres, and a finishing line supplies scale, grit, tank edges and metal shavings. This is what will actually retire the band |
| Swelling, softening or a tacky surface | Any part of the band that is swollen, softened, sticky or has changed dimension | The signature of chlorinated solvent or aromatic attack. There is no field repair and no way to clean polypropylene back to a rated condition |
| Known contact with an oxidising acid | Any contact with nitric, chromic or a nitric-hydrofluoric bath, whether intended or not | The one acid family that attacks this fibre, and on a multi-stage line the crossing happens by accident more often than by design |
| Stitching, eyes and splices | Broken, pulled or loose stitches, or an open lap splice | The stitch carries the whole load and cannot be repaired on site. On a two-stage line inspect the splice and the eye reinforcement as closely as the body, because that is where chemistry collects |
| Fittings | Corrosion, pitting, cracking, deformation, or any fitting that has been in a caustic or acid environment and cannot be shown to be suitable | Aluminium is severely degraded by alkali, caustic environments, acids and salt water, high-strength alloy fittings are susceptible to hydrogen embrittlement in acidic conditions, and the US rule separately prohibits aluminium fittings where caustics are present |
| Colour transfer to the load | Any sign that the sling has marked the material it carried | The load-protection case for white is the reason it was bought; if the band is marking work, something other than the webbing is transferring colour and it needs finding |
| Loading history | A known shock load, an overrun, or a lift taken on the wrong hitch figure | Polypropylene stretches about 5% at the working load limit, enough to leave a permanently elongated section after a snatch load |
| Whole assembly | Any one sling in the set fails, or the legs are of mixed fibre, mixed band, mixed colour or mixed length | An assembly is only as strong as its weakest leg, and on a two-stage line mixing slings mixes chemistries as well: the leg that ends up over the wrong tank is the one that fails |
Care rules for a white acid-resistant and alkali-resistant sling.
- Never use a polypropylene webbing sling below −40 °C or above +80 °C.
- Decide the sling count before the lift on a multi-stage line, and keep each band with the stage it was bought for. The commonest failure on this product is a band that was bought for the acid tank and used in the degreasing bath.
- Rotate the loop between lifts on an endless sling, and alternate the eyes on an eye-and-eye sling, so that wear, staining and abrasion keep moving round the band rather than collecting in one place.
- Do not drag a sling on the floor or over tank edges, scale or metal shavings, and never pull a sling out from under a load resting on it.
- Do not twist, knot, shorten or lengthen a sling, and never repair one.
- Fit edge protection wherever the band crosses a sharp or finished edge, at any load.
- Rinse acid and caustic off with clean water and dry naturally before the band goes back on the rack. On a two-stage line this is the single most effective habit there is, because a drying band concentrates the chemistry inside its own weave.
- Wash with mild soap and water only. Never clean a white band with a solvent, and never repaint, re-ink or re-dye a stripe or a capacity colour: published sling guidance is explicit that paint should not be used to colour-code webbing because the solvents in the paint can corrode the synthetic material.
- Store dry, dark and off the floor, away from oil, chemicals, solvent vapour and sharp edges. A white band stored where it cannot be seen will not be inspected.
- Keep the band clear of chlorinated solvents, aromatics, tars, paints and strong oxidising acids. A white polypropylene band belongs over a hydrochloric pickling tank, not beside a degreasing bath.
- Put UV-exposed white bands into a documented inspection programme, and judge them by feel — a white band does not fade, so stiffness is the first sign of UV damage.
- In an assembly, inspect every sling in the set and keep the set together.
- Cut a retired sling through before disposal so that it cannot be put back into service by mistake.
8. Marking, Traceability and the Colour Question
The marking is part of the product rather than a finishing touch, and on a white band it is doing more work than usual. The table sets out what has to be there and what it is for.
What a white sling has to carry, and why
| Mark | What it states | Status | The white-band consequence |
|---|---|---|---|
| Black transverse stripes | The working load limit, one stripe per tonne | Required capacity marking | On a white band this is the primary capacity cue — keep it legible and keep it clean |
| Identification label | Working load limit in words and figures, fibre, standard reference, length, traceability code | Required | On a white band the label is the only written capacity source, so a destroyed label takes the sling out of service |
| Fibre identification | Brown for polypropylene | Required | The label colour is how a rigger confirms the fibre, which on this product is the whole reason the sling works |
| Webbing colour | White, at the customer's request | A deviation from the capacity colour sequence | Quoted as a deviation, so that the buyer knows the band colour is not carrying capacity information |
| Manufacturer and traceability code | Who made it and which batch it came from | Standard practice | This is what links a band in service back to the batch it was tested with; keep it readable on a wet line |
| Customer marking or logo | Nothing about capacity | Permitted alongside, never instead | Do not let a customer colour or logo displace the stripes or the label; and never paint the webbing itself |
How we handle the colour deviation. For a white band we quote and supply the sling white, with the capacity carried on the stripe count and the label, and we say so on the document rather than letting the buyer assume the colour code is present. Where a customer prefers the standard capacity colour, we supply the code colour on the same construction, because the white is a requirement rather than a constraint of manufacture. Where a white band and a coloured band sit in the same rigging store, we mark the white ones so that the two cannot be confused, and the same white construction also goes out under the white polypropylene lifting belt heading if that is the term your system uses (see the white polypropylene sling page).
9. Standards and the Regulatory Position on a Combined-Duty Sling
What the product is built to. White acid-resistant and alkali-resistant slings are made to EN 1492-1, Textile slings — Safety — Flat woven webbing slings made of man-made fibres for general purpose use, which covers Type A to Type D sewn slings in polyamide, polyester or polypropylene across webbing widths of 25 mm to 450 mm and sets out the requirements for design, testing and marking. The bands on this page are polypropylene at a 7:1 safety factor, and the white webbing is the one deliberate departure from the standard's presentation, quoted as a deviation.
The same product under two rulebooks. Because this product crosses two chemistries, it is the page where the difference between the standards matters most. The table sets the two regimes side by side, quoting the regulation directly where the regulation is what is being described.
Two rulebooks: EN 1492-1 and the US market rules, for a sling that meets both chemistries
| Point of comparison | EN 1492-1 (Europe and most export markets) | ASME B30.9 with the US sling rule, OSHA 1910.184 |
|---|---|---|
| Safety factor behind the marking | 7:1 for flat woven webbing slings | Commonly a 5:1 design factor, so the same nominal marking corresponds to a smaller breaking load |
| Colour code | A capacity colour sequence for the band, with the black stripe count repeating the capacity. There is no white in that sequence | Not mandated; the identification tag is the authority, and the colour is best practice rather than a requirement |
| Polyamide (nylon) on acid duty | The fibre is attacked by acids, so acid duty points away from polyamide on materials grounds | Nylon web slings shall not be used where fumes, vapors, sprays, mists or liquids of acids or phenolics are present — 1910.184(i)(6)(i). A prohibition, not a caution |
| Polyester and polypropylene on caustic duty | The fibre position differs between the two: polyester is attacked by alkalis and polypropylene is unaffected | Polyester and polypropylene web slings shall not be used where fumes, vapors, sprays, mists or liquids of caustics are present — 1910.184(i)(6)(ii) |
| Aluminium fittings on caustic or acid duty | Fitting material is quoted against the duty | Web slings with aluminum fittings shall not be used where fumes, vapors, sprays, mists or liquids of caustics are present — 1910.184(i)(6)(iii); and published manufacturer data notes that aluminium is severely degraded by alkali, caustic environments, acids and salt water |
| Temperature ceilings | Polypropylene −40 °C to +80 °C; polyester and polyamide −40 °C to +100 °C | The regulation gives polyester and polyamide web slings a ceiling of 180 °F (82 °C) and polypropylene 200 °F (93 °C) — the ranking of the fibres is reversed against EN 1492-1 |
| Fibres other than polyamide and polyester | Type A to D covers polyamide, polyester and polypropylene | Published OSHA guidance states that synthetic webbing materials other than nylon and polyester are also used and that the manufacturer should be consulted for specific data — which is why the fibre data on this page is sourced rather than assumed |
| What counts as chemical exposure | Contact with the substance, at a stated concentration and temperature | Published guidance states that the strength of synthetic webbing slings can be degraded by chemically active environments, including exposure to chemicals in the form of solids, liquids, vapours or fumes — so vapour above a tank is exposure |
| Removal from service | Damage criteria including cuts, abrasion, chemical and heat damage, and illegible marking | The regulation and published guidance both list acid or caustic burns, melting or charring, excessive abrasive wear, discoloration and brittle or stiff areas, and missing or illegible identification among the conditions requiring immediate removal from service |
Duties a white acid-resistant and alkali-resistant sling is not rated for, at any band.
- Lifting or suspending a person.
- Towing, recovery or vehicle pulling — the rating is a lifting rating and tow loads are shock loads.
- Staying in place permanently as a tie, guy or restraint.
- Being knotted or twisted to shorten it.
- Lifting over an unprotected sharp edge without a sleeve.
- Contact with chlorinated solvents, aromatic hydrocarbons, tars, paints or strong oxidising acids — this is the polypropylene limitation, and on a multi-stage line it is the one that catches buyers out.
- A caustic stage in a market that follows the US sling rule — the fibre is unaffected by alkali, but the rule prohibits polyester and polypropylene web slings where caustics are present. Tell us the market and we will quote the fibre the rulebook allows for that stage.
- Use as a single-trip consumable — this is a re-usable EN 1492-1 band at 7:1 and it carries an inspection regime; a one-way sling is a different product under a different standard.
- Aluminium or high-strength alloy fittings on acid or caustic duty without the fitting material being specified for the duty.
- Working on or near live electrical conductors.
- Service above +80 °C.
10. How to Order: The Line Checklist
This product is quoted from a line rather than from a tank, so the enquiry has one extra field in it compared with a single-chemistry sling. Everything below is a question we will ask anyway; sending it up front is what turns the quotation around faster.
The order checklist for a white acid-resistant and alkali-resistant sling
| What we need | What to send | Why it changes the answer |
|---|---|---|
| Every stage on the line | The full sequence, in order, from the first clean to the last rinse | The stage pair decides the fibre, and the crossings between stages are where the sling gets attacked |
| Chemistry per stage | Chemical name, not the trade name of the process | Mineral acid, strong oxidising acid, caustic and solvent have four different answers, and the words pickle and clean do not distinguish them |
| Concentration and temperature per stage | Working strength and working temperature | A solution that is harmless at working strength concentrates as water evaporates, and hot chemistry is harder on the sling than cold |
| Splash or immersion | Whether the sling crosses above the tank or goes into it | Exposure to vapour and mist counts as exposure, and immersion adds rinse, dry and storage requirements |
| Destination market | Where the sling will be used, and the standard you must satisfy | It decides whether the caustic stage is a fibre question or a regulatory one, and whether the label must show 7:1 or another factor |
| White or code colour | Whether the webbing must be white, and whether capacity may be carried on the stripe count and label | If white is not needed, the standard capacity colours are the better specification and this is the moment to say so |
| Band and ply | The band, or the load and the hitch, and we will do the arithmetic | Choked, basket, multi-leg and off-centre hitches all reduce the effective rating, so the band is decided by the hitch rather than by the load alone |
| Form and length basis | Endless or eye-and-eye, and the length basis for that form | Loop circumference and bearing point to bearing point are different measurements of the same job |
| Edge protection | Whether the band crosses tank edges, plate edges or a small diameter | Diameter of curvature is part of the rating, and polypropylene is the most abrasion-prone of the three fibres |
| Fittings | Whether the sling is to be an assembly, and the chemistry the fittings will meet | Aluminium and high-strength alloys both have chemistry limits, and on a two-stage line the fitting is often the part that is wrong |
| UV stabilisation | Whether the band lives outdoors or beside a window | Polypropylene has the poorest UV resistance of the three, and on a white band the usual fading cue is missing |
| Quantity, and certification | How many, and whether a test certificate or third-party witnessing is required | Traceability depends on the batch, so it has to be set at order rather than at delivery |
11. Frequently Asked Questions
Q1: What is a white acid-resistant and alkali-resistant sling?
Q2: Is a white sling the same as a white one-way or single-use sling?
Q3: Why is the sling white, and how do I read its capacity?
Q4: Which fibre is a white acid and alkali resistant sling made from?
Q5: Can one sling really cover both an acid and an alkali stage?
Q6: Can I use this sling in a caustic bath?
Q7: Will a white sling lose capacity when it is wet?
Q8: What temperature can a white acid and alkali resistant sling work at?
Q9: Which chemicals will damage a white acid and alkali resistant sling?
Q10: What do you need from me to quote a white acid and alkali resistant sling?
Contact us — white acid-resistant and alkali-resistant slings direct from the manufacturer
Send us the line rather than the tank — every stage, the chemical, the concentration, the temperature, and whether the sling is splashed or dipped — and we will come back with a specification and a price for your white acid-resistant and alkali-resistant sling: band, fibre, ply, width, length, webbing colour and marking all on one sheet, with the fitting material called out if the sling is to be an assembly. We build to order in single or double ply, in polypropylene, polyester or polyamide, in any length from 1 m to 12 m and beyond, with the black capacity stripe count and a legible identification label as standard, UV-stabilised webbing for outdoor duty, and matching sets for two-leg and four-leg assemblies. Volume discounts apply.
- Contact: Wang Lili
- Phone: 18066002268
- E-mail: 702461526@qq.com
- Address: Lifute Industrial Park, Taizhou City, Jiangsu Province, China
- Send an enquiry >>
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