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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 acid-alkali flat double-ear lifting belt - a flat woven webbing sling with a reinforced eye at each end, built to EN 1492-1 and made to order from 1 t to 10 t in single or double ply. Double-ear means eye-to-eye: two reinforced eyes, a bearing point at each end, and a length measured from bearing point to bearing point rather than end to end. Woven from polypropylene, supplied in white webbing where the load must not be marked or the line must show contamination early, and chosen for plants that run both an acid stage and an alkali stage, because polypropylene is unaffected by acids and by alkalis while the other two common fibres each fail one of the two. 7:1 safety factor and a minimum breaking load of seven times the working load limit, eyes reinforced to the EN 1492-1 minimum, edge protection and UV-stabilised webbing on request, any length from 1 m to 12 m. 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：2026-09-21 08:19
Lift Sling Rigging Co., Ltd. +8618066002268 produces Acid-alkali flat double-ear lifting belt, white polypropylene flat lifting belt, white lifting belt.
Acid-Alkali Flat Double-Ear Lifting Belt
Acid-alkali flat double-ear lifting belt — eye-to-eye white polypropylene webbing to EN 1492-1, 1 t to 10 t, single or double ply, length measured bearing point to bearing point, any length from 1 m to 12 m
What is on this page. This page is about the eye-to-eye form: how the eyes are built, how long they have to be, how the length is measured, how ply works, and how the form interacts with the acid-alkali chemistry it is bought for. It also covers the hitches a double-ear sling is used in, how it is inspected, and how the market's inconsistent use of the EN 1492-1 type letters creates specification traps.
What the product is, and what the words around it actually mean — section 1
The double-ear band range and the specification table — section 2
The eye: construction, minimum length, and how it takes the hook — section 3
Single ply, double ply and the band — section 4
Length: the specification trap — section 5
Acid and alkali: what the double-ear belt meets — section 6
Hitches a double-ear sling is used in, and what each does to the rating — section 7
Inspection and retirement criteria, eye first — section 8
Marking, traceability and the type letters — section 9
How to order: the checklist — section 10
1. What an Acid-Alkali Flat Double-Ear Lifting Belt Is
The product is a flat woven webbing sling with a reinforced eye at each end, woven from polypropylene and sewn to EN 1492-1, which covers these slings in polyamide, polyester or polypropylene across webbing widths of 25 mm to 450 mm and designates them by type. The three words in front of the product name all do work: acid-alkali says which chemistry it is bought for, flat says it is a woven band rather than a round sling, and double-ear says the load is taken on two eyes, one at each end.
On the words belt and sling. In this industry the two are used interchangeably for this product, and a quotation may use either without meaning anything different. Outside the industry they are not: lifting belt is also the name of a back-support belt worn by a person, which is a different product, sold through a different channel and marked to a different regime. That is why our names always qualify the term — double-ear lifting belt, flat lifting belt — instead of using lifting belt on its own, and why it is worth checking which of the two a search result is selling before reading its load figures.
The letters of the type designation are the real trap here. EN 1492-1 designates these slings by type, and in the trade the letters are applied inconsistently: published catalogues use the same letter for the ply count, for the eye configuration and for whether the sling has metal fittings, in different combinations from different suppliers. The practical consequence is simple: a quotation that specifies only a type letter has not specified the product. On this page and on our quotations the construction is always stated in words as well — the number of plies, the eye type and whether there are fittings — and section 9 returns to the point.
Terminology: what the words in the quotation actually mean
| Term you may be offered | What it actually is | What to check |
|---|---|---|
| Acid-alkali flat double-ear lifting belt | Flat woven polypropylene webbing, reinforced eye at each end, for a plant running an acid stage and an alkali stage | Ply, eye type, length basis and fittings — the four things the name does not tell you |
| Double eye sling, eye-to-eye sling, two-eye sling | The same construction named by the eyes rather than by the trade word ear | The same four |
| Flat lifting belt, webbing belt, belt sling | The same product under a different trade word. Belt and sling are interchangeable in this industry | Which product the seller means, because lifting belt also names a back-support belt worn by a person |
| Double-ear sling with fittings | An eye-to-eye sling where at least one end carries a metal fitting. The webbing may be right and the fitting wrong for the chemistry | The fitting material against the chemistry — see section 6 |
| Round sling, round lifting belt, braided sling, rond sling | A different product: a load-bearing core of yarn inside a woven tubular cover, under EN 1492-2 | The standard. A flat woven sling and a round sling are not interchangeable |
| Single-ply or double-ply sling | The same flat woven construction with one or two thicknesses of webbing in the body | Ply is a construction figure, not a rating — a 5 t sling is 5 t in either ply |
| White one-way sling, single-use sling, disposable sling | A consumable built to a one-way standard, normally rated no higher than 1,000 kg, permitted one trip and then destroyed | Whether the product is re-usable. The sling on this page is a re-usable EN 1492-1 band at 7:1 |
2. The Double-Ear Band Range, 1 t to 10 t
The band works exactly as it does across the rest of the flat woven range, because the band is set by the standard rather than by the form. On a white band the capacity is carried by the black transverse stripes, one stripe per tonne, and by the identification label, because white sits outside the EN 1492-1 capacity colour sequence; on a capacity-coloured band the webbing colour is the first signal and the stripes repeat it.
Acid-alkali flat double-ear lifting belt: band specification, 1 t to 10 t
| Band | 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) | Typical use of a double-ear form at this band |
|---|---|---|---|---|---|---|
| 1 t | 1 t / 1,000 kg / 2,205 lb | 7 t | 0.8 t | 2 t | 1.4 t | Light parts racks, small bundles, one-hook picks |
| 2 t | 2 t / 2,000 kg / 4,409 lb | 14 t | 1.6 t | 4 t | 2.8 t | The most common pickling-line band |
| 3 t | 3 t / 3,000 kg / 6,614 lb | 21 t | 2.4 t | 6 t | 4.2 t | Pipe bundles, plate, plated part baskets |
| 4 t | 4 t / 4,000 kg / 8,818 lb | 28 t | 3.2 t | 8 t | 5.6 t | Longer bundles and two-hook picks |
| 5 t | 5 t / 5,000 kg / 11,023 lb | 35 t | 4.0 t | 10 t | 7.0 t | Heavier plate and coil, usually double ply |
| 6 t | 6 t / 6,000 kg / 13,228 lb | 42 t | 4.8 t | 12 t | 8.4 t | Heavier duty; confirm the hook and eye fit |
| 8 t | 8 t / 8,000 kg / 17,637 lb | 56 t | 6.4 t | 16 t | 11.2 t | Double ply and above; eye length and hook width matter |
| 10 t | 10 t / 10,000 kg / 22,046 lb | 70 t | 8.0 t | 20 t | 14.0 t | Top of the flat woven range; consider whether a round sling suits better |
How to read this table on a double-ear sling.
The rating is the rating, however wet the sling is. Polypropylene takes up below 0.1% of its own weight in water, so a sling that has been through a rinse tank still carries the figures above. On a pickling line that is a working advantage rather than a footnote.
Capacity does not change with the number of eyes. A two-eye sling is one sling with two ends, not two slings: the rating above applies to the sling, and assembling two of them into a two-leg rig gives the assembly a factor of 1.4, not double.
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.
The ply behind the band is a separate decision. The same band is built in single ply on a wider webbing or in double ply on a narrower one, and above the mid bands in more plies again. Section 4 covers the trade.
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 load points that way.
3. The Eye: Construction, Minimum Length, and How It Takes the Hook
On an eye-to-eye sling the eyes are where the load enters the product and where the stitching that carries the whole load sits. They are also the part most often specified by habit rather than by figure, which is why this section is the longest on the page.
The eye on a double-ear sling: what is specified, and what it does
| Element | What it means in practice | The figure or rule that applies |
|---|---|---|
| Eye length | The length of the reinforced loop at each end, measured along the webbing | EN 1492-1 sets a minimum of three times the strap width for widths up to 150 mm, and two and a half times the strap width above 150 mm |
| Eye configuration | Whether the eye is a flat eye, a folded eye, a reversed eye or a folded scalloped eye. The configuration decides how the eye sits on the hook and whether the sling tends to rotate in the lift | Published European product data describes reinforced folded scalloped eyes used specifically to prevent the sling rotating during the lift, with the eye opening oriented across the lifting plane |
| Reinforcement | Extra webbing, extra stitching or a wear pad at the eye, so that the wear and the hook contact are taken by sacrificial material rather than by the load-bearing body | Standard on our slings; wear pads on both sides on request |
| Stitching | The stitch pattern at the eye is the joint that carries the whole load. It is the first thing to inspect and the one thing that can never be repaired on site | Inspected before every use; see section 8 |
| Hook fit | The eye has to take the hook. An eye that is too small for the hook, or a hook too wide for the eye, forces the eye open and loads the reinforcement instead of the webbing | Give us the hook or the shackle and we will size the eye to it rather than assume |
| Bearing point | The point inside each eye where the load actually bears. It is the reference for the length and the point from which the working length is measured | Bearing point to bearing point — section 5 |
| Eye protection | A sleeve or pad over the eye where the hook, a shackle or a sharp edge would otherwise cut into the reinforcement | Published European guidance is explicit that slings must be protected whenever they are used in a configuration with sharp angles, and lists polyurethane, PVC and leather sleeves among the options |
Why the minimum eye length is a safety figure and not a cosmetic one. A short eye concentrates the load into the reinforced end: the same force passes through less webbing, the angle at which the webbing leaves the hook steepens, and the bearing area on the hook shrinks. On a two-eye sling used in a basket hitch the eye is also the point the load doubles back through, which makes the reinforcement carry the worst of both. The EN 1492-1 minimum exists to stop that concentration, and it scales with width, because a wider band carries more load and needs more length to spread it.
Scalloped and reversed eyes solve a specific shop problem. On a long or very flexible sling, a flat eye can roll and the sling can rotate in the lift, which puts the wear on an unpadded edge and puts the eye at an angle to the hook. A folded scalloped eye or a reversed eye changes the plane in which the eye opening sits so that the sling resists rotating. If your riggers keep reporting that the sling spins, that is the specification conversation to have, rather than buying a heavier band.
4. Single Ply, Double Ply and the Band
Ply is how many thicknesses of webbing are stacked in the body of the sling. It is the second figure buyers leave out, and like the length basis it changes what arrives without changing the band.
Single ply against double ply on a double-ear sling
| Single ply | Double ply | |
|---|---|---|
| What it is | One thickness of webbing sewn into two eyes | Two thicknesses stacked and sewn as one body, with eyes formed through the stack |
| Band it reaches | The lower and middle bands, on a wider webbing | The same band on a narrower webbing; the practical way to reach the heavier bands without an unwieldy width |
| Weight and feel | Lighter and more flexible; easier to handle and to thread | Heavier and stiffer; holds its shape, which helps in a basket hitch and where the sling must not fold |
| Wear life | Fewer layers to wear through | More material at the contact points, so more to wear through, provided the sling is still rotated |
| Eye construction | A single-thickness reinforced eye | A thicker eye stack — confirm the eye still fits the hook, because a double-ply eye is bulkier in the same opening |
| Usually chosen when | The load is light, the hook is small, or the riggers handle the slings constantly | The band is high, the width is constrained, or abrasion is the main wear mechanism |
| What does not change | The band, the colour or stripe marking, the safety factor, the length basis and the inspection regime | The band, the colour or stripe marking, the safety factor, the length basis and the inspection regime |
Above two plies. Flat woven slings reaching the highest bands are built from more plies again, and published European product data maps the progression directly: a two-ply sling for the smaller and middle capacities, and a four-ply sling for the heavier ones, with the ply count doing the work that a wider webbing would otherwise have to do. It is also why the type letters stop being reliable as a description: once ply count is part of the designation, a supplier using the letter for ply and a supplier using it for eye configuration are describing different products with the same label.
5. Length: The Specification Trap
A flat woven sling can be quoted at three different lengths for the same physical object, and all three can be honestly described. This is the single most common reason a correct-looking sling arrives and does not fit the rig, so it is worth settling before the order rather than at goods-in.
The three length bases, and which one a double-ear sling uses
| Basis | What is measured | Used for | The trap |
|---|---|---|---|
| Bearing point to bearing point | The distance between the two points where the load bears — the inside of each eye — with the sling laid flat and not under tension | Eye-to-eye slings, including every double-ear sling on this page. This is the effective working length | It is shorter than the tip-to-tip measurement, because the eyes are excluded. This is the basis to order on |
| Overall length, tip to tip | The full length of the sling laid flat, from the outer end of one eye to the outer end of the other | Describing a sling that already exists; some quotations use it without saying so | Depends on the eye length, so the same figure can describe two slings of different working length |
| Loop circumference | The distance all the way round a continuous loop | Endless slings, not eye-to-eye slings. A double-ear sling has no circumference | A frequent cross-wiring between the two forms: a circumference quoted for an eye-to-eye sling is meaningless |
The industry term to ask for. The published definition of the effective working length is the actual finished length of the sling from bearing point to bearing point, measured with the sling laid flat. Ask for the effective working length and the answer is unambiguous, whichever supplier you are talking to.
How we handle it. Our quotations for this product state the effective working length, bearing point to bearing point, as the order figure, and state the ply and the eye configuration alongside it, because the eye configuration changes how much length the eye consumes. Where a customer's rig is specified in another basis, we convert before quoting rather than after, and where the length is critical to a pick angle, tell us the rig rather than the sling: a longer sling in a fixed-height rig gives a smaller angle from vertical, which changes the load in each leg.
6. Acid and Alkali: What the Double-Ear Belt Meets
The chemistry side of this product is the same as the rest of the white acid-alkali family, so this section keeps to what is specific to the eye-to-eye form: the eye, the stitching and the fittings are the parts that see the chemistry worst, because they hold the liquid after the body has drained, and because the eye is the part that goes into the tank when a rigger dips the sling to reach a load.
Stage by stage: what a two-stage line asks of a double-ear sling
| Stage | What the sling meets | The fibre position | What to watch on a double-ear sling |
|---|---|---|---|
| Alkaline or caustic degrease | Hot caustic or alkaline cleaner | Fibre fine: polypropylene is unaffected by alkalis; polyester is the fibre caustic attacks | The rulebook, not the fibre, is the issue in the US market — section 9. On the sling itself, watch the eye reinforcement and the stitch line, which hold the chemistry |
| Acid pickle, hydrochloric or sulfuric | Warm mineral acid with mist above the tank | Polypropylene unaffected; polyamide is attacked by acids | Drain and dry the eyes. A flat eye is a pocket: it keeps the liquid that the body sheds |
| Rinse, neutralise and phosphate stages | Water, then dilute chemistry | No wet derating applies to this fibre | Rinse with the eyes downwards, so the water carries the chemistry out rather than into the reinforcement |
| Passivation, stainless pickling, chromic or conversion coating | Strong oxidising acids | Not polypropylene — strong oxidising acids attack it | The trap on a multi-stage line: the sling that is right for the hydrochloric bath is wrong for the nitric bath under the same crane |
| Electroplating and anodising | Acid and alkaline dips, drips and mist above the line | Polypropylene for the acid and neutral stages | Published guidance treats chemical exposure as including vapours and fumes, so a sling hung on the rail above the line is in the chemistry |
| Any stage where the sling is dipped, not just splashed | Full immersion, eyes and all | Immersion does not weaken polypropylene; it concentrates chemistry inside the weave as the sling dries | Say immersion on the enquiry. The answer may be a different end configuration rather than a different fibre |
The fittings question, which lands hardest on this form. A double-ear sling is the form most likely to be built as an assembly with metal in the load path, because the whole point of having eyes is to attach something to them. On acid-alkali duty that makes the fittings the weak link rather than the webbing:
Aluminium is severely degraded by alkali, caustic environments, acids and salt water. Published manufacturer data says so directly, and the US rule separately prohibits aluminium fittings where caustics are present. An aluminium fitting on a caustic stage is wrong twice over.
High-strength alloy fittings are susceptible to hydrogen embrittlement in acidic conditions. Published industrial guidance is consistent on this and keeps those grades out of pickling and galvanising lines altogether, which is why the strength of the fitting is not the selection criterion here.
The safe default on acid-alkali duty is no metal in the load path at all — a soft-eyed double-ear sling hooked directly, rather than an assembly with shackles. Where the rig genuinely needs a fitting, give us the chemistry and we will specify the fitting material against it.
7. Hitches a Double-Ear Sling Is Used In
The form decides which hitches are natural. An endless sling is indifferent to where the load enters it; a double-ear sling puts the load into two reinforced ends every time, which is a strength and a limitation at once.
Hitches on a double-ear sling, and what each does
| Hitch | How a double-ear sling is used | Factor | What it does to the sling |
|---|---|---|---|
| Vertical, one eye on the hook | One eye on the hook, the other on the load or on a fitting | 1.0 | Both eyes work in the same plane. The simplest and the best for an eye-to-eye form |
| Basket, both eyes on the hook | The sling passes under the load and both eyes go onto the hook, so the body doubles back under the load | 2.0 for the parts that are parallel | Doubles the bearing area on the load, which is why it is the preferred hitch for finished and coated work. It also puts the worst of the curvature into the eye where the sling bends back |
| Choked | The sling passes round the load and back through its own eye | 0.8 | Costs 20% of the rating, and puts one eye in a tightening noose around the body, so that eye takes the abrasion as well as the load. On a double-ear sling the choked eye is the first part to wear out |
| Two-leg assembly | Two slings, or one sling used as two legs, brought to a master link | 1.4 within 45 degrees of vertical | A four-leg assembly is rated at 2.1 rather than 4.0, because it is rated as if only three legs carry the load. An assembly is never the sum of its slings |
| Two-eye sling used as a bridle | One eye at each pick point, spread over the load | Depends on the included angle | The eyes are loaded across the width rather than along it. Tell us the angle: an eye loaded across its width is a different bearing case from one loaded along it |
| Off-centre pick | Two pick points, load centre of gravity not between them | One sling takes up to 67% where the centre of gravity sits a third of the way along | The most under-estimated case in practice. It is a rigging calculation, not a sling choice |
One thing the form makes worse, and one it makes better. Worse: the eyes are the wear points, and they are the same two points on every lift, so wear, staining and abrasion concentrate there in a way they do not on a loop that can be rotated. Better: an eye takes a hook predictably, so a rigger knows exactly where the load enters, the eye can be padded and reinforced at design, and a sling with a damaged eye can often be confirmed out of service by inspection of that one area.
8. Inspection and Retirement Criteria, Eye First
Every sling should be inspected before every use, with a documented periodic inspection on top of that. On a double-ear sling the order of the inspection is different from a loop: start at the eyes, because that is where the load enters, where the stitch carries everything and where a two-stage line deposits its chemistry.
Double-ear sling: what to check, in order, and when to withdraw
| Order | What to look at | Withdraw the sling if | Why it matters on this form |
|---|---|---|---|
| 1 | Stitching at the eyes | Broken, pulled, loose or distorted stitches; an eye that has opened or changed shape | The stitch is the joint that carries the whole load and cannot be repaired. On an eye-to-eye sling there are two of them and both matter |
| 2 | Eye reinforcement and wear pads | A torn, worn through or missing reinforcement, or a wear pad that has gone down to the body | The reinforcement is sacrificial by design — once it is gone, the wear is into load-bearing webbing |
| 3 | Eye shape and hook fit | An eye stretched or distorted, or an eye that no longer sits correctly on its hook | A distorted eye means the load has been taken other than as designed, usually by a hook that did not fit |
| 4 | Chemistry in the eye | Dried salts, staining or residue held in the eye, or a stiff or glazed eye after a confirmed tank contact | The eye is a pocket. On a multi-stage line it holds the last chemistry the sling met, and it is the first place a burn starts |
| 5 | Webbing body | Cuts, snags, fraying, exposed load-bearing yarn, or damage reaching about 10% of the webbing width in any transverse section | Abrasion is the mechanism that retires flat woven slings, and polypropylene is the most abrasion-prone of the three fibres |
| 6 | Colour, stripe count and label | The stripes cannot be counted, or the count disagrees with the label; or the label is missing or illegible | On a white band the stripes and the label are the whole capacity message, so an unreadable marking is a capacity failure rather than a cosmetic one |
| 7 | Stiffness and feel | A noticeable stiffening, a hard or brittle feel, or a powdery surface | The primary UV and heat signal on a white band, which does not fade visibly the way a coloured band does |
| 8 | Heat damage | Glazing, melting, scorch marks or weld spatter | Polypropylene has the lowest heat ceiling in the range at +80 °C, with a softening point near 150 °C |
| 9 | Solvent or aromatic contact | Swelling, softening, tackiness, or a known contact with a chlorinated solvent, paint or tar | Polypropylene softens in chlorinated solvents and is attacked by aromatics, and cannot be cleaned back to a rated condition |
| 10 | Oxidising acid contact | Known contact with nitric, chromic or a nitric-hydrofluoric bath | The one acid family that attacks this fibre; on a multi-stage line the crossing usually happens by accident |
| 11 | Fittings | Corrosion, pitting, cracking, deformation, or a fitting whose material cannot be shown to suit the chemistry | Aluminium is degraded by alkali, acid and salt water; high-strength alloys are susceptible to hydrogen embrittlement in acid. On this form the fitting is often the part that is wrong |
| 12 | Labels and traceability | The label is missing or illegible — the working load limit, fibre, standard, length or traceability code | The label is what certifies the sling, and on a wet line it is the first thing a splash destroys |
| 13 | The set, if it is an assembly | Any one sling in the set fails, or the legs are of mixed band, mixed ply, mixed length or mixed fibre | An assembly is only as strong as its weakest leg, and mixing legs mixes chemistry as well as capacity |
Care rules for an acid-alkali double-ear lifting belt.
Never use a polypropylene webbing sling below −40 °C or above +80 °C.
Rinse with the eyes down, and dry the eyes first. A flat eye is a pocket: it is where the chemistry sits, and it is the hardest part of the sling to dry.
Do not let the sling hang on the rail above a tank between lifts. Published guidance treats chemical exposure as including vapours and fumes, so parking it in the vapour is exposure, not storage.
Keep each sling with the stage it was bought for. The commonest failure on a two-stage line is a sling bought for the acid tank being used in the degreasing bath.
Rotate the sling end for end between lifts where the rig allows it, and inspect both eyes every time: on this form the two eyes do not wear equally, and the inferior one is the one nobody looks at.
Do not drag a sling over tank edges, scale, grit 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 — the eye stitch in particular cannot be repaired.
Pad every sharp edge and every finished surface the sling crosses, at any load.
Wash with mild soap and water only. Never clean a sling with a solvent, and never paint or ink a stripe or a capacity colour back on: published guidance warns that the solvents in paint corrode the synthetic material.
Store dry, dark and off the floor, away from oil, chemicals, solvent vapour and sharp edges.
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.
9. Marking, Traceability and the Type Letters
The marking is part of the product rather than a finishing touch, and on a double-ear sling it carries one extra piece of information that a loop does not need: the length, and the basis it was measured on.
What an acid-alkali double-ear lifting belt has to carry, and why
| Mark | What it states | Why it matters on this form |
|---|---|---|
| Working load limit code | The band, by webbing colour and by the black stripe count, one stripe per tonne | On a white band the colour carries no capacity, so the stripes are the first signal a rigger reads |
| Identification label | Working load limit in words and figures, fibre, standard reference, length, traceability code | On a white band this is the only written capacity source; a destroyed label takes the sling out of service |
| Fibre identification | Brown for polypropylene | The label colour is how the fibre is confirmed, and the fibre is the reason the sling works on both chemistries |
| Length and basis | The effective working length, bearing point to bearing point | The figure most often disagreed about on an eye-to-eye sling, because tip to tip is longer and loop circumference is meaningless here |
| Ply and eye configuration | Stated in words on our documentation | The two figures the type letters fail to communicate reliably |
| Manufacturer and traceability code | Who made it and which batch it came from | It links the sling in service back to the batch it was tested with |
| Customer marking | Nothing about capacity | Permitted alongside the required marks, never instead of them; and the webbing itself is never painted or inked to fake a colour code |
The type letters, dealt with properly. EN 1492-1 designates these slings by type, and it is worth being blunt about how those letters behave in the market, because this is the page where the form is the product. Published catalogues from different suppliers use the same letter for the number of plies and for the eye and fitting configuration, and describe the same construction under more than one letter. Two consequences follow:
A type letter is not a specification. If a quotation says type B and nothing else, ask for the ply, the eye configuration and whether there are fittings, in words. That is not pedantry: those three answers decide the weight, the hook fit and the chemistry at the fittings.
Our own documents state the construction in words and give the standard reference. We will quote the type where a customer's system requires the field, and we will state the construction alongside it so that the record means something when the sling is inspected two years later.
What the product is built to. The slings on this page are made to EN 1492-1, Textile slings — Safety — Flat woven webbing slings made of man-made fibres for general purpose use, at a 7:1 safety factor, in polypropylene, in single or double ply, with webbing widths from 25 mm to 450 mm. White webbing is the one deliberate departure from the standard's presentation and is quoted as a deviation.
The same product under two rulebooks
| 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 |
| Type designation | Type letters are part of the designation, and are used inconsistently in the trade — state the construction in words | The US convention uses a different set of type numbers altogether, so a type letter or number does not travel between markets |
| 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) |
| Polyester and polypropylene on caustic duty | 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 | 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) |
| Temperature ceilings | Polypropylene −40 °C to +80 °C; polyester and polyamide −40 °C to +100 °C | The regulation gives polyester and polyamide 180 °F (82 °C) and polypropylene 200 °F (93 °C) — the ranking of the fibres is reversed against EN 1492-1 |
| Removal from service | Damage criteria including cuts, abrasion, chemical and heat damage and illegible marking | Acid or caustic burns, melting or charring, excessive abrasive wear, discoloration and brittle or stiff areas, and missing or illegible identification are all listed as requiring immediate removal |
Duties an acid-alkali double-ear lifting belt 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, or used with an eye pulled open to force it onto a hook that does not fit.
Lifting over an unprotected sharp edge without a sleeve.
Contact with chlorinated solvents, aromatic hydrocarbons, tars, paints or strong oxidising acids — the polypropylene limitation, and the one most often crossed on a multi-stage line.
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.
Aluminium or high-strength alloy fittings on acid or caustic duty without the fitting material being specified for the chemistry.
Use as a single-trip consumable — this is a re-usable band with an inspection regime.
Working on or near live electrical conductors, or in service above +80 °C.
10. How to Order: The Checklist
This product has more fields than a single-chemistry sling of the same band, because both the chemistry and the form have to be pinned down. Everything below is a question we will ask anyway; sending it up front is what turns the quotation around faster and stops a correct-looking sling arriving at the wrong length.
The order checklist for an acid-alkali flat double-ear lifting belt
| What we need | What to send | Why it changes the answer |
|---|---|---|
| Every stage on the line | The full sequence, in order, with the chemical, concentration and temperature for each | The stage pair decides the fibre, and the crossings between stages are where the sling gets attacked |
| Splash, mist or immersion | Whether the sling crosses above the tank or goes into it | Vapour and mist count as exposure, and immersion adds rinse, dry and storage requirements — including drying the eyes |
| Destination market and standard | Where the sling will be used and the standard it 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 |
| Band, and the hitch | The band, or the load and how it will be hitched | Choked costs 20%, basket doubles the parts that are parallel, and a two-leg assembly is 1.4 rather than 2.0 |
| Ply | Single or double ply, or let us weigh the width against the band | Ply changes the weight, the width and the bulk of the eye in the same opening |
| Eye configuration and eye length | The hook or shackle that will enter the eye, and the direction of pull | From those two answers the eye configuration, the length and the reinforcement follow, and the EN 1492-1 minimum eye length applies |
| Length and the basis | The effective working length, bearing point to bearing point | Tip to tip and loop circumference are different measurements of the same job, and a quotation that does not state the basis is ambiguous |
| Eye protection | Whether the eyes cross sharp edges, finished surfaces or small diameters | Diameter of curvature is part of the rating, and webbing slings must be protected in configurations with sharp angles |
| Fittings | Whether the rig needs metal in the load path, and what that metal will meet | Aluminium and high-strength alloys both have chemistry limits; the safe default on acid-alkali duty is no metal at all |
| Webbing colour | Whether the webbing must be white, and whether capacity may be carried on the stripe count and label | White is outside the capacity colour sequence, so the trade is a deliberate one and we quote it as a deviation |
| UV stabilisation | Whether the sling lives outdoors or beside a window | Polypropylene has the poorest UV resistance of the three, and a white band does not fade visibly, so damage has to be found by feel |
| 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 an acid-alkali flat double-ear lifting belt?
Q2: Is a lifting belt the same thing as a webbing sling?
Q3: How is the length of a double-ear sling measured?
Q4: How long does the eye have to be?
Q5: What is the difference between single ply and double ply?
Q6: What does the type letter in a quotation mean?
Q7: Can a double-ear sling be used in acid and in alkali?
Q8: Which metal fittings can be used on acid-alkali duty?
Q9: What is the minimum breaking load of a double-ear sling?
Q10: What do you need from me to quote an acid-alkali double-ear lifting belt?
Contact us — acid-alkali flat double-ear lifting belts direct from the manufacturer
Tell us the chemistry the sling will meet and the hook it will sit on, and we will come back with the specification and price for your acid-alkali flat double-ear lifting belt: band, fibre, ply, eye configuration, effective working length, webbing colour, edge protection 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 and beyond, in polypropylene, polyester or polyamide, in any length from 1 m to 12 m, with eyes reinforced to the EN 1492-1 minimum, 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
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