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Polypropylene flat lifting strap-polypropylene flat sling-polypropylene lifting sling
Polypropylene flat lifting strap
Polypropylene flat lifting strap-polypropylene flat sling-polypropylene lifting sling

Lift Sling Rigging Co., Ltd. manufactures the polypropylene flat lifting strap - a flat woven webbing strap built to EN 1492-1, made to order from 1 t to 10 t in single ply or duplex, in any length from 1 m to 12 m. A polypropylene lifting sling is specified for two reasons: polypropylene is the one fibre of the three that acids and alkalis both leave alone, and it takes up below 0.1% of its own weight in water, so a wet band carries its dry rating. This page covers the article itself - the yarn, the weave, the ply and the sewn joint, the band width that carries the working load limit, the contact pressure a flat band puts into a steel pipe or a roll, the difference between a lifting strap to EN 1492-1 at 7:1 and a lashing strap to EN 12195-2 at 2:1, how polypropylene stretches about 5% at the working load limit and creeps more than the other two common lifting fibres, inspection and retirement, marking with the EN 1492-1 colour and the brown polypropylene label, and a nine-line specification sheet. 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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Polypropylene Flat Lifting Strap

Polypropylene Flat Lifting Strap (also ordered as a polypropylene lifting sling or a PP flat strap) is a flat woven webbing strap woven from 100% high-tenacity polypropylene and made up by Lift Sling Rigging Co., Ltd. to EN 1492-1, from 1 t to 10 t in single ply or duplex, in any length from 1 m to 12 m. The word strap describes the form, not the rating: one flat band, two ends, and no metal in contact with the load. Polypropylene is chosen for it because it is the one fibre of the three that acids and alkalis both leave alone, because it takes up below 0.1% of its own weight in water so a wet band carries its dry rating, and because it is the lightest of the three. Its limits are as specific as its strengths: keep it clear of chlorinated solvents, aromatic hydrocarbons and strong oxidising acids, keep it below +80 °C, and remember that polypropylene creeps more than polyester or nylon. Every band carries the EN 1492-1 colour for its working load limit, one black capacity stripe per tonne, a brown label naming the fibre, a 7:1 safety factor and a minimum breaking load of seven times the working load limit, on bands from 25 mm to 250 mm. This page is about the strap itself — how it is woven, how ply and band width set its capacity, what it does on a round load, and how to write the specification. The chemistry has its own page, linked in section 1.

Polypropylene flat lifting strap - flat woven polypropylene webbing strap to EN 1492-1, 1 t to 10 t

Polypropylene flat lifting strap in the standard band, sewn to order in single ply or duplex, 1 t to 10 t, with the EN 1492-1 colour and the brown polypropylene label fitted by us before dispatch.

1. What a Polypropylene Flat Lifting Strap Is

A polypropylene flat lifting strap is a flat woven webbing lifting accessory: a band of high-tenacity polypropylene yarn, woven to a fixed width, plied to the capacity it has to carry, and closed at each end by a sewn joint into the end the customer needs. It is covered by EN 1492-1, the European standard for flat woven webbing slings made from man-made fibres, and it carries a minimum safety factor of 7:1 — the band is proof loaded and destructively tested so that the minimum breaking load is at least seven times the marked working load limit.

The words matter less than people expect, and this is worth saying before anything else on the page. In catalogues and purchase orders the same article is written as a flat webbing sling, a flat lifting strap, a PP strap, a flat belt or a polypropylene lifting sling, and none of those words changes what the goods are. What does change the goods is three other things: whether the accessory is rated for lifting at all or is a load restraint (section 6), which form it takes — endless or eye-and-eye, and what the ends are made up with if it is a made-up assembly. A quotation that only repeats the noun has not specified a product.

This page covers the strap as an article: the yarn, the weave, the ply, the seam, the band width that sets the capacity, how the same band behaves when the load is round rather than flat, how polypropylene behaves under sustained load, what is marked on it, and how to write the specification so the quotation comes back right. It deliberately does not repeat the material comparison or the chemical resistance work that already sits on this site:

The word strap is not a specification. A supplier who is asked for a “flat lifting strap” can ship a 1 t single ply band, a duplex band, a one-way disposable band, or a load restraint with a ratchet on it, and all four can be described accurately as a flat strap. The four numbers that remove the ambiguity are the standard and safety factor, the working load limit and ply, the band width, and the length with its datum. They are set out as a sheet in section 11.

2. Inside the Strap: Yarn, Weave, Ply and the Seam

A flat strap is not a solid material. It is a woven structure, and the parts of it that fail are not the parts buyers look at. The five components below are worth knowing by name because every one of them can be named in a specification, and because three of them are invisible from the outside in normal use.

ComponentWhat it isWhat it decidesWhere it shows in service
Warp yarnThe lengthwise high-tenacity yarns, running the full length of the bandThe capacity. The warp carries the load; the weft only holds the warp in place as a bandPulled or broken warp yarns on the face of the band are a removal criterion, not a cosmetic issue
Weave and weftThe interlacing that turns parallel yarns into a band of a fixed width and thicknessThickness, flexibility and how the band rations its own wearWeft damage loosens the band; the load-bearing yarn is then free to move and abrade itself
SelvedgeThe woven edge of the band, formed as it is woven rather than cut afterwardsWhether the band can fray. A woven edge resists the abrasion that a cut edge does notEdge wear is the most common first damage on a strap used over steel; watch both edges, not the face
PlyThe number of woven layers in the band: single ply is one layer, duplex is two layers stitched together along their lengthThe capacity at a given band width, and how stiff the band is to handleA duplex band wears on the outer layer first, which is the reason it lasts longer on abrasive work
Sewn joint, and the label sewn into itThe stitching that closes the ends, forms the eyes and holds the layers and the identification labelWhere the band is joined, and therefore a place that has to be inspected as a joint rather than as a surfaceDamaged or loose stitching is a removal criterion. So is a label that can no longer be read

The sequence a strap goes through in our works is a short one, and it explains why the colour and the label are not decoration: yarn matching, warping, weaving, dyeing to the capacity colour, measuring and fusing, joint sewing, label sewing, tensile testing, packing. The dyeing step is what fixes the colour to the capacity of that specific band, and the label step is what ties the band to its test record. A band that is dyed to the right shade but carries the wrong number of stripes is a process failure, not a colour error.

What this means when you buy: the capacity of a strap is a property of the band and its construction, and the colour is the standard’s way of reporting it to a slinger at a glance. Colour is a marking requirement — it is not a quality grade and it is not a certificate. Asked for a strap by colour alone, a supplier can ship a conforming band or a non-conforming one in the same shade.

3. The Range: Width, Ply and Working Load Limit, 1 t to 10 t

Under EN 1492-1 the working load limit of a flat woven sling is derived from the working load limit of the webbing component in it. That is the reason a strap is sold as a band plus a ply count rather than as a single number: the same 75 mm band in single ply and in duplex are two different products, and the capacity belongs to the construction, not to the colour printed on the outside of it. The table below is the band range we quote most often, with the EN 1492-1 colour and stripe marking and the mode factors for the three hitches a flat strap is actually used in.

Working load limit, straight liftWebbing colour and black stripesTypical band width, single plyMinimum breaking load at 7:1Choked hitch (0.8)Basket, parts parallel (2.0)Two-leg assembly (1.4)
1 tViolet, 1 stripe25 mm to 30 mm7 t0.8 t2.0 t1.4 t
2 tGreen, 2 stripes50 mm14 t1.6 t4.0 t2.8 t
3 tYellow, 3 stripes75 mm21 t2.4 t6.0 t4.2 t
4 tGrey, 4 stripes100 mm28 t3.2 t8.0 t5.6 t
5 tRed, 5 stripes125 mm35 t4.0 t10.0 t7.0 t
6 tBrown, 6 stripes150 mm42 t4.8 t12.0 t8.4 t
8 tBlue, 8 stripes200 mm56 t6.4 t16.0 t11.2 t
10 tOrange, 10 stripes250 mm70 t8.0 t20.0 t14.0 t
On the band width column. The widths given are the ones we make most often in single ply, and they run at roughly 25 mm of band per tonne. They are not the standard — the standard fixes the working load limit and the colour, and it does not dictate a width for it. Two consequences follow. A duplex strap reaches a given working load limit on a narrower band than the single ply figure, because the second layer carries load as well. And where the band has to pass through a particular hook throat, sit in a particular pipe hook, or ride in a channel, the band width has to be confirmed on the drawing rather than read off a table. Tell us the width you can accommodate and we will quote the ply that reaches your working load limit inside it.

Two more points about the range are worth stating plainly, because both catch buyers out across borders. Above 10 t the colour is no longer standardised. The standard assigns colours through the 10 t band; beyond that the colour is left to the manufacturer, which is why 12 t bands are very often orange as well and why colour in heavy tonnage is a hint rather than an identifier. And the colour states a straight-lift capacity only. A red 5 t strap gives 5 t vertical, 4.0 t choked and 10.0 t in a parallel basket; the colour reports the vertical number and nothing else. The per-hitch figures belong to the label.

Straps above 10 t, four-leg assemblies, and matched sets of two straps for a spreader beam are made to order — send the load and the rigging and we will come back with the geometry rather than with a catalogue number.

4. Single Ply or Duplex, and How the Strap Is Made Up

Ply is the variable that confuses buyers most, because it is invisible on a finished band and because two straps of the same width and the same colour can be different products. Single ply is one woven layer. Duplex is two woven layers stitched together along their length, and the load is carried by the yarn in both. That, and not styling, is what the second layer buys.

Point of comparisonSingle plyDuplex (two ply)
ConstructionOne woven layer, sewn at the ends and at the eyesTwo woven layers stitched together along their length, then sewn at the ends and eyes
CapacityThe base figure for the bandHigher at the same band width, which is how the heavier bands are reached without an unwieldy width
Wear in serviceThe band is one layer thick; a worn face is a proportion of the whole bandThe outer layer takes the abrasion first. This is why duplex lasts longer on steel and on rough racks
HandlingSofter and more pliable; conforms to an awkward shape more readilyStiffer and bulkier; needs more room in a hook throat or an eye
InspectionBoth faces are the load-bearing layer; check bothCheck the inner layer too where the outer is worn through — the layer underneath is what is still carrying
When to choose itLight to medium loads, awkward shapes, one-way or short-life duty, and where band thickness is limitedHigher capacity in the width you have, abrasive loads, and any duty where the strap is expected to be used for years

Length and the datum. Length on a made-up strap is measured from bearing point to bearing point, not end to end and not as a flat length of webbing. The trade name for this is the effective working length, and it is the length that matters because it is what sits between the hook and the load. Two straps can be ordered at “2 m” and arrive 200 mm apart if one is quoted bearing point to bearing point and the other tip to tip. We quote bearing point to bearing point unless the enquiry says otherwise, and we mark the datum on the drawing so it can be checked on arrival. The same datum governs the eye: the eye is part of the length, not extra to it.

The eye. The minimum length of the eye is set by the standard as a multiple of the band width — not less than 3 times the band width for bands up to 150 mm, and not less than 2.5 times the band width above that. This is not a manufacturing preference; a short eye concentrates the load into the reinforced end and reduces the bearing area on the hook, which is what damages both the strap and the hook. If a customer asks for a short eye to fit a tight hook, the right answer is usually a narrower band with the same capacity in duplex, not a shorter eye.

The ends. A flat strap is made up with the end the job needs: a plain soft eye, a reinforced eye, a thimble eye, or a ring or buckle-type fitting. The words anchor eye, anchor ring and anchor buckle are used for these ends in some catalogues and for separate hardware items in others, so they do not specify a product on their own; if what you need is the ring or the buckle as a hardware item, buy it as hardware. The forms and the terminology are set out on the flat lifting strap page, and the eye-to-eye form with its type letters is on the double-ear page. The endless (continuous loop) form is covered on the endless webbing sling page.

The specification trap, in one sentence. “1 t flat strap, 2 m” leaves the ply, the band width, the end and the datum open, and any two suppliers will fill those four gaps differently. Write the standard, the working load limit with the ply, the band width, and the length with the datum — then the quotation is comparable.

5. A Flat Strap on a Round Load: Pipes, Bundles and Rolls

A flat strap is at its best on a flat load, where the band lies on the surface and spreads its pressure across the full width. Put the same strap round a pipe, a roll or a bundle and the situation changes, and it changes in a way that has nothing to do with the capacity of the strap. The band is still rated for what it is rated for; what has changed is the pressure between the strap and the load.

On a round load the contact is not a surface, it is a band wrapped round a cylinder, and the pressure it exerts is set by the geometry. For a flat woven band wrapped round a circular section and contacting half its circumference, the contact pressure is:

p = 2T / (w × D)
  • p is the contact pressure between the band and the load
  • T is the tension in the band on one side of the load
  • w is the band width
  • D is the outside diameter of the pipe or roll

Two properties of that expression are worth carrying away. The pressure is constant over the half of the circumference the band wraps and falls to zero where the band leaves the load, so the pressure is not a peak in one spot but a load the whole contact length shares. And the pressure is inversely proportional to both the band width and the diameter — double the width and you halve the pressure; double the pipe diameter and you halve it again. Friction is neglected, which is the usual engineering simplification and is conservative in the sense that it does not flatter the numbers.

The table below is that formula worked for a 3 t lift, so T = 3 t = 29.43 kN on one side and 2T = 58.86 kN, across the band widths we make and three pipe sizes. Every figure in it is reproducible from the formula above with a calculator.

Band widthPipe OD 168.3 mm (6 in)Pipe OD 273 mm (10 in)Pipe OD 508 mm (20 in)What it tells you
25 mm14.0 MPa8.6 MPa4.6 MPaNarrow band on small pipe: the highest pressure in the table, on the load least able to take it
50 mm7.0 MPa4.3 MPa2.3 MPaHalving nothing but the width has already halved the pressure
75 mm4.7 MPa2.9 MPa1.5 MPaA 75 mm band is the size we quote most often for pipe work of this weight
100 mm3.5 MPa2.2 MPa1.2 MPaWhere the pipe is thin-walled, width is the cheap part of the solution
150 mm2.3 MPa1.4 MPa0.8 MPaWide band and large diameter together: pressure stops being the question, and the band becomes the handling problem

Read the table as a comparison model, not as a pipe design calculation. It tells you which lever moves the pressure — width, diameter, or the number of straps sharing the load — and it does not tell you what a given pipe will take. That number is the pipe’s own allowable bearing stress, and it belongs to the pipe, its wall thickness and its grade, not to us. If you send us the pipe schedule and the lift weight, we will quote a band that keeps the pressure low, and we will say so if what you actually need is a pipe hook, a spreader beam or two straps rather than one wider one.

Three things that follow for pipe work. First, do not read capacity as contact safety: a 3 t strap on a 168.3 mm pipe is perfectly rated and can still mark it, and the table above is what decides whether it does. Second, a chain or a bare hook is the opposite case — it does not spread at all, which is exactly why a flat band is used on pipe in the first place. Third, a strap can walk on a round load: a pipe in a basket can rotate and the band can slide along it, so a round load is normally taken with two straps at the balance points, or with a spreader, rather than with one band placed by eye.

Rolls, coils, bundles and large-diameter thin-wall pipe are the same problem with different numbers. Bundles add a second question — whether the band bears on the outer pipes, which are the ones that deform first — and that is a rigging question rather than a strap question; we will ask for the bundle section and the strapping pattern before quoting.

6. Strap or Lashing Strap: the Distinction That Matters

This section exists because “flat lifting strap” and “lashing strap” are one word apart in a search box and a whole standard apart in law. They look similar, they are both webbing, both can carry the same colour, and both are sold by people who may not ask you which one you meant. They are not interchangeable, and the difference is not one of quality — it is one of design intent, and the numbers on the label are the visible part of it.

Point of comparisonA lifting strap — EN 1492-1A lashing strap — EN 12195-2
What it is forLifting a load. EN 1492 covers synthetic fibre slings used for lifting, not for lashingRestraining a load on a vehicle during transport
Design factor7:1 — minimum breaking load is at least seven times the working load limit2:1 — the complete lashing must withstand at least twice its lashing capacity without failure
The ratingWLL, a weight, in tonnes, for a straight liftLC, a force, in daN — plus BF (breaking force), STF (standard tension force) and SHF (standard hand force), which describe tensioning rather than lifting
Proof load in production2 × WLL1.25 × LC
ColourStandardised by WLL, with the black stripe count as a cross-checkNot standardised — manufacturer specific. Colour cannot be read as a capacity
MarkingWLL for straight lift, material of the webbing, manufacturer, standard reference, length and a traceability codeLC, material, manufacturer, traceability code, year, standard reference, elongation, and the mandatory statement NOT FOR LIFTING
CE markingSupplied as lifting accessories with a declaration of conformityA lashing strap is never CE marked — the standard forbids it
ElongationDepends on the fibre; polypropylene stretches about 5% at the working load limitThe label states the maximum, and the standard allows 7% at LC
Never lift with a lashing strap, and never restrain a load with a lifting strap. The rule is stated in the standards themselves: because the safety factors for lifting equipment differ from those for lashing equipment, it is expressly forbidden to use lashing equipment as lifting equipment, which is why every conforming lashing label carries the words “NOT FOR LIFTING”. The reverse direction is stated just as plainly — the lifting standard covers slings used for lifting, not for lashing. A catalogue that lists “lashing, towing and lifting” on one line for a webbing product is not permission to do any of the three with it; it is a reason to ask which standard the goods were made to. If what you need is load restraint, the right answer is a load restraint, and we will say so rather than sell you a strap for a job it was not designed for.

7. Polypropylene Under Sustained Load: Stretch, Creep and What It Does in a Mill

Capacity is what a strap is bought for and elongation is what it is lived with. Polypropylene is the fibre of the three that stretches most and the one that creeps most, and both facts show up on the shop floor rather than on the certificate. The numbers below are the ones to hold in mind.

FigureThe numberWhat it means on a lift
Elongation at break, polypropylene webbing15% to 25%The band is forgiving of a snatch load in the sense that it stretches a long way before it parts, but a long stretch also means the load moves further than the operator expects if it comes free
Stretch at the working load limit, polypropyleneabout 5%On a 2 m strap, a hook that sits 100 mm higher than it did before the band took up is normal, not a fault. Build the height into the rigging and the job
Stretch at the working load limit, polyester, for comparisonbelow 3%Where a lift has to be repeated to the same height dozens of times a shift, the fibre changes the sequence, not just the strap
Creep, polypropylene against the other two fibresPolypropylene creeps most; nylon is moderate; high-tenacity polyester is the most resistant of the threeCreep is the loss of tension in a band that is held under a constant force over time. A polypropylene band left with a load hanging on it relaxes

The practical consequences are worth spelling out, because they are the reason a polypropylene strap is often the right strap and sometimes the wrong one. A band under sustained tension will relax as it creeps, so a polypropylene strap is a poor choice for anything that has to stay tensioned for hours or days — a permanent tie, a rack restraint, a band left rigged on a load overnight. It is a good choice for a lift that is picked up, moved and set down, which is what a lifting operation is. And creep is a second reason not to judge a strap by feel: a band that has gone slack may be creeping, or it may have stretched and settled as the load found its bearing, and neither condition is visible in the weave.

Where the stretch changes the answer: in a two-leg or four-leg assembly, the legs do not share the load equally once one of them is longer or softer than the others, and stretch is part of that. Matched sets, cut to the same bearing-point length and from the same run of webbing, are worth asking for where a load has to hang level. Where a lift is repeated to a fixed height, the uptake of the band belongs in the rigging drawing — again, polyester is the fibre with the least give if height control matters more than chemistry.

8. What Polypropylene Is Not For: Three Chemicals and a Temperature Ceiling

This page is about the strap rather than about the fibre, so this section is deliberately short, and it points to the polypropylene flat sling page for the class-by-class chemistry and for what a pickling line stage by stage asks of a band. The four limits worth carrying in your head before you specify are these:

  • Strong oxidising acids. Polypropylene is unaffected by the mineral acids that a carbon steel pickling line uses, and this is the main reason it is specified there. It is not suitable for strong oxidising baths — nitric acid, chromic acid, and the nitric-hydrofluoric mix used for stainless pickling and passivation. A line that runs both carbon steel and stainless steel can need two different straps.
  • Chlorinated solvents. Keep the band clear of them; they attack polypropylene where acids do not.
  • Aromatic hydrocarbons. Same rule, same mechanism.
  • Heat above +80 °C under the EN 1492-1 temperature rules, and hot concentrated chemistry that reaches that band. Note that the American rule set orders polypropylene against polyester and nylon differently from the European one, so a strap may not be transferred between two rule systems without checking the numbers in both. The two systems are set side by side on the polypropylene flat sling page.

Two warnings that belong to this page specifically. “Acid-washed sling” is not a material specification — it describes what the buyer has been doing, not what the goods will survive, and the acid matters. And hardware is where an acid line usually fails, not the webbing: a polypropylene band is inert to the acid it was bought for, and the shackle, the hook, the thimble and the fittings are not. High-strength alloy fittings are the ones to be careful with in acid and in hot galvanising. If your strap is supplied as a made-up assembly, say so, and we will quote the fittings with the duty named.

9. Inspection and Retirement Criteria for a Flat Strap

A flat strap is inspected on the band, on the sewn joints and on the label, and the inspection is the same operation whether the strap is new or years old. The five conditions below are the ones that take a polypropylene strap out of service. They are removal criteria, not judgement calls: a band that meets one of them does not go back on the hook, and a strap is never repaired.

What to look atWithdraw the strap ifWhy it matters on a polypropylene flat strap
The bandCuts, tears, snags, or pulled and broken warp yarnsThe warp is the load path. A pulled yarn is a hole in the capacity of the band, not a surface blemish
The sewn joint and the eyesDamaged, loose or broken stitching, or a distorted eyeThe sewn joint is where the band is joined, and it is a joint before it is a surface. Inspect it as one
The edgesEdge wear, fraying, or a selvedge worn through to the weftOn steel work the edges take the abuse long before the face does. Check both edges, along the full length
Chemical and heat damageAcid or alkali burns, a band that has stiffened, glazed, melted or changed colour in patchesChemical damage in a synthetic band shows as stiffening and discolouration; heat damage shows as glazing or melting. Both are removal criteria in published sling guidance
ContaminationGrit, dried acid solids, cement or process dust worked into the weaveAbrasives held in the weave grind the warp every time the band is loaded. Wash and dry it, and do not store it wet
The labelMissing, illegible, or not matching the strapNo label, no service — that is the rule, not a preference. The label is the only thing tying this band to its capacity and its test record
Fittings, if the strap is an assemblyCracked, deformed, corroded or worn fittings; a thimble that has movedThe assembly is rated at its weakest part, and on an acid line the fittings usually fail before the band does

Two further rules keep the inspection honest. Shock loading sends a strap into inspection, not straight back on the rack — a band that has taken a snatch or a dropped load is inspected before it is used again. And protection does not change the inspection frequency: a sheathed or padded strap is inspected on the same schedule as a bare one, and where a sleeve is damaged, the band underneath it is inspected too, because the sleeve has been doing the work the band would otherwise have done. Sleeves, pads and edge guards are covered on the reinforced and sheathed lifting straps page.

Do not read the colour as the condition. A faded, dyed or contaminated band still shows something that looks like a colour. The colour tells you what the strap was made to carry; the weave, the stitching and the label tell you what it can carry now.

10. Marking, Standards, Packing and HS Code

A conforming flat strap carries its capacity in two places — the webbing colour with its stripe count, and the label — and the two are meant to be read together, because colour can fade and a stripe count cannot be guessed at. The label is where the evidence lives.

What is on itWhat it tells youThe trap
Webbing colourThe working load limit band, for a straight liftIt reports the vertical figure only. Choked, basket and multi-leg capacities are different numbers and they are on the label
Black stripesOne capacity stripe per tonne, a cross-check on the colourWhere colour fades or is misread under poor light, the count is the reliable half of the pair. Read both
Label colourThe material of the webbing: blue for polyester, green for polyamide, brown for polypropyleneGreen webbing means two tonnes; a green label means nylon. Same word, the same strap, two unrelated meanings. On this product the label is brown
Label textWLL for a straight lift, the material of the webbing, the standard reference, the manufacturer, the length and a traceability codeThis is the specification you can check against your purchase order, on arrival. The lower part of the label is sewn into the seam so the identification survives the exposed part being damaged
The standard namedWhich rule set the strap was made to: EN 1492-1 (7:1), ASME B30.9 (commonly 5:1) or AS 1353 (commonly 8:1)Two identical-looking bands of the same colour can be different objects. The colour code of one standard does not apply to goods made to another

Packing and export. Straps are supplied shrink-wrapped and packed in export cartons on pallets, or in bulk on the pallet for large orders, and each bale carries the batch identification. The HS code is 630790. We supply the declaration of conformity and, on request, the batch tensile test certificate with the shipment — ask for it in the enquiry so it is quoted with the goods rather than chased afterwards. Straps above 10 t, matched sets and made-up assemblies are quoted separately, and assemblies are quoted with the fitting material named against the duty.

11. How to Order: the Flat Strap Specification Sheet

Nine lines, and every one of them is a line we have had to ask for at some point. Send them and the quotation comes back once. Leave the four marked critical out and the quotation comes back with questions, because there is no single correct answer to any of them.

Line on the specificationWhat to writeWhy we need it
1. Standard and safety factor criticalFlat woven webbing strap to EN 1492-1, safety factor 7:1It separates a lifting strap from a load restraint, and it fixes the colour code that applies
2. Form and endsEndless loop, eye-and-eye, or an assembly with the end named: soft eye, reinforced eye, thimble, ring, buckleIt changes the goods. “Strap” can be made up in the endless form or with two ends, and they are not interchangeable in use
3. Working load limit, ply and band width criticalWLL in tonnes for a straight lift, single ply or duplex, band width in mm or the maximum width the rigging will takeCapacity is a property of the band and its construction. The width is also what sets the contact pressure on a round load — see section 5
4. Length and the datum criticalLength in mm or m, stating bearing point to bearing point unless you want another datum called outTwo straps ordered at “2 m” on two different datums arrive 200 mm apart, and a matched pair then hangs unevenly
5. The load criticalWeight, shape, and for round work the outside diameter and wall thicknessOn a pipe this is what decides whether the band marks the load, and whether a wider band or a hook is the answer
6. HitchStraight, choked, basket, two-leg or four-leg, and the angle if it is not verticalThe mode factor changes the working load limit, and the assembly angle changes the leg tension
7. EnvironmentThe chemicals the band meets, their concentration and their temperature, and the working temperature range“Acid-washed” is not enough — the acid decides. On this page’s product it is also the line that may send you to polyester on temperature grounds
8. ProtectionEdges it crosses, corners, whether a sleeve or pads are wantedCutting is the leading cause of synthetic strap failure, and the protection is priced with the goods or not at all
9. Marking, packing and paperworkQuantity, packing, banded sets, and whether the batch test certificate is neededMatched sets and certificates are quoted as part of the order, never discovered at loading
The five that go wrong most often, in our experience: the length datum left unstated; a working load limit quoted where a minimum breaking load was meant, or the reverse; “acid-resistant” quoted without naming the acid; a colour quoted instead of a working load limit, in a standard whose colours are not the ones the buyer had in mind; and a pipe diameter left off an enquiry, which makes it impossible to check the contact pressure against the load.

12. Frequently Asked Questions

Q1: What is a polypropylene flat lifting strap?
It is a flat woven webbing lifting strap made from high-tenacity polypropylene, made to EN 1492-1 with a 7:1 safety factor, and supplied from 1 t to 10 t in single ply or duplex, in any length from 1 m to 12 m. It is the form of this range that is chosen when the band has to lie flat against the load rather than sit in a groove or on a hook, and the fibre is chosen for chemical duty — polypropylene is the one fibre of the three common ones that both acids and alkalis leave alone. It is marked with the EN 1492-1 colour for its working load limit, one black capacity stripe per tonne and a brown label identifying the fibre.
Q2: Is a flat lifting strap the same as a flat webbing sling?
In the trade the two phrases are used for the same article, and this site uses both: strap describes the form, sling describes the function. Neither word is a specification, and neither tells you what you are buying. The questions that do are the standard and safety factor, the form and the ends, the working load limit with the ply and band width, and the length with its datum. A quotation that only repeats the noun has not specified anything.
Q3: Is a flat lifting strap the same as a ratchet strap or a lashing strap?
No, and the difference is a standard rather than a grade. A lifting strap is made to EN 1492-1 with a 7:1 safety factor and is rated as a working load limit in tonnes. A lashing strap is made to EN 12195-2, is rated as a lashing capacity in daN, and its breaking force only has to reach twice that. Every conforming lashing label carries the words “NOT FOR LIFTING”, and the rule is explicit: it is forbidden to use lashing equipment as lifting equipment. A lashing strap is also never CE marked. If what you need is load restraint, buy load restraint.
Q4: What is a duplex polypropylene lifting strap?
Duplex means two woven layers stitched together along their length, as against single ply, which is one layer. The second layer carries load as well, so a duplex strap reaches a given working load limit on a narrower band than a single ply one — which is how the heavier bands are made without an unwieldy width. The outer layer also takes abrasion first, so a duplex band generally outlasts a single ply band on steel and on rough racks. It is stiffer and bulkier, and it needs more room in a hook throat or an eye.
Q5: What is the working load limit of a polypropylene flat lifting strap?
We make them from 1 t to 10 t for a straight lift, which is the figure the colour reports, and the minimum breaking load is at least seven times that at the 7:1 safety factor. The other hitches carry different figures: the choked hitch is 0.8 of the vertical rating, a basket is 2.0, and a two-leg assembly is 1.4. So a 5 t strap gives 5 t vertical, 4.0 t choked and 10.0 t in a parallel basket. Above 10 t we make to order — and above 10 t the EN colour stops being standardised, so the label, not the colour, is what to read.
Q6: Why does the band width matter when the load is a steel pipe?
Because on a round load the pressure between the strap and the load is set by the geometry. For a band wrapped round a pipe the contact pressure is 2T divided by (band width × outside diameter), where T is the tension in the band. Width and diameter both divide the pressure, so a wider band on the same lift puts less pressure on the pipe. At a 3 t lift on a 168.3 mm pipe, a 25 mm band puts about 14 MPa into the pipe and a 75 mm band about 4.7 MPa. Whether the pipe can take a given pressure is a question for the pipe’s own allowable bearing stress and its wall thickness — send us the schedule and the lift weight and we will quote the band, and tell you if a pipe hook or a spreader is the better answer.
Q7: How much does a polypropylene strap stretch?
Polypropylene webbing elongates about 15% to 25% at break, and a band stretches about 5% at its working load limit — more than polyester, which stays below about 3%, and less than nylon. Polypropylene is also the fibre of the three that creeps most, which means a band held under a constant force relaxes over time: nylon is moderate and high-tenacity polyester is the most resistant. That makes it a poor choice for anything that has to stay tensioned for hours or days, and it is why a strap that looks slightly slack after a shift is not necessarily damaged.
Q8: Which chemicals must a polypropylene strap avoid?
Three groups and one temperature: chlorinated solvents, aromatic hydrocarbons, and strong oxidising acids — nitric acid, chromic acid and the nitric-hydrofluoric mix used for stainless pickling and passivation. Keep it below +80 °C under the EN 1492-1 rules, and note that the American rule set orders polypropylene against the other two fibres differently, so a strap should not be moved between rule systems without checking both. Ordinary mineral acids and alkalis are the case polypropylene is bought for. The class-by-class detail is on the polypropylene flat sling page.
Q9: What is the HS code for a polypropylene flat lifting strap?
630790. Straps are supplied shrink-wrapped in export cartons on pallets, or in bulk on the pallet for large orders, with the batch identification on each bale, and we issue the declaration of conformity for the shipment. Ask for the batch tensile test certificate in the enquiry and it is quoted with the goods.
Q10: What do you need from me to quote a polypropylene flat lifting strap?
Four things are critical: the standard and safety factor you are buying to, the working load limit with the ply and the band width you can accommodate, the length with its datum, and the load itself — weight, shape and, for round work, the outside diameter and wall thickness. The form and the ends, the hitch, the chemistry and temperature the band will meet, the protection it needs, and the quantity and paperwork complete the sheet, which is set out line by line in section 11. Send all of it and the quotation comes back once, with a firm price.

Contact us — polypropylene flat lifting straps direct from the manufacturer

Tell us the load, the rigging and the duty the strap will meet, including the pipe diameter if the load is round and the chemicals if the strap meets any, and we will come back with the specification and price for your polypropylene flat lifting strap: band, ply, width, length, ends and marking all on one sheet, with the fitting material named if the strap is to be a made-up assembly. Volume discounts apply. We build to order in single ply or duplex, in polypropylene, polyester or polyamide, in any length from 1 m to 12 m and beyond, with the EN 1492-1 colour code, one black capacity stripe per tonne and the brown polypropylene label as standard. UV-stabilised webbing for outdoor and yard duty, matched sets for two-leg and four-leg assemblies, and sheathed or padded straps for edge and abrasive duty are supplied on request.


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