The same PU leather article, quoted by two mills, can differ by 18 % on thickness alone — and both quotes are honest.
PU leather: why the headline number is the least useful one
Every quotation leads with thickness. But it tells you almost nothing on its own: thickness sets the frame, and the parameters below set whether the product survives its first year in service.
For PU leather, the practical rule is to fix the headline figure at the level your product needs and then spend your negotiating attention on peel strength and hydrolysis resistance.
The PU leather numbers that decide performance
| Parameter | Typical range | What it changes | Thickness | 0.5-1.5 mm | Handle and fold behaviour. Under 0.6 mm the material creases sharply and cracks. | Backing | knitted / woven / non-woven | Knitted stretches, woven is stable, non-woven is cheapest and weakest at seams. | Peel strength | >= 6 N/50 mm | The number that predicts whether the skin separates from the backing. | Hydrolysis resistance | 5 years at 70 C / 95 % RH equivalent | Critical for bags and furniture shipped to humid markets. | Abrasion | >= 20 000 Martindale cycles | Seat and bag applications; below 10 000 the surface goes shiny then breaks. | Cold flex | -20 C, 30 000 cycles | Winter markets and unheated warehouses. | Surface finish | release paper / cast / embossed | Release paper gives the most leather-like grain and costs the most. | Colour fastness to rubbing.5-1.5 mm | >= grade 4 | Dark shades transfer onto light upholstery and clothing. |
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Thickness
Typical range: 0.5-1.5 mm . Handle and fold behaviour. Under 0.6 mm the material creases sharply and cracks.
Backing
Typical range: knitted / woven / non-woven . Knitted stretches, woven is stable, non-woven is cheapest and weakest at seams.
Peel strength
Typical range: >= 6 N/50 mm . The number that predicts whether the skin separates from the backing.
Hydrolysis resistance
Typical range: 5 years at 70 C / 95 % RH equivalent . Critical for bags and furniture shipped to humid markets.
Abrasion
Typical range: >= 20 000 Martindale cycles . Seat and bag applications; below 10 000 the surface goes shiny then breaks.
Hydrolysis resistance: range, tolerance and the clause
For PU leather, the working range is 5 years at 70 C / 95 % RH equivalent .
How to choose a hydrolysis resistance option
| Option | What it changes in PU leather | When it is the right choice | 5 years at 70 C | The lowest-cost option in the family. Colour transfer is where it usually ends up. | Cost-led programmes with a short service life.5-1.5 mm | 95 % RH equivalent | The volume middle: enough margin for process variation without paying for headroom the end product cannot use.5-1.5 mm | Most repeat programmes, and the safest default.5-1.5 mm | 95 % RH equivalent | The top of the family, where the process is controlled tightly enough to guarantee it.5-1.5 mm | A warranty, a tender, or a specification that cannot be renegotiated.5-1.5 mm |
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Hydrolysis resistance is chosen by the application rather than by price, and a supplier who quotes one option as if it were interchangeable with another is quoting a different product.
The figure that decides the outcome is not hydrolysis resistance itself but the tolerance around it. A supplier who quotes 5 years at 70 C / 95 % RH equivalent without a tolerance has not quoted a specification, and the first lot will define the tolerance for you.
How to measure hydrolysis resistance
The reference method here is Cold flex , run to ISO 7854 / -20 C, with an acceptance of >= 30 000 cycles.
A marginal pass on hydrolysis resistance tells you the process is running at the edge, which is the information you need before the next lot rather than after it.
The clause to write for hydrolysis resistance
Hydrolysis resistance appears with a tolerance and a test, not as a standalone number.
Peel strength: range, tolerance and the clause
What >= 6 N/50 mm does not tell you
| Position | Value | Effect on PU leather | Where it shows up | Floor | >= 6 N/50 mm | Lowest cost, least margin for process variation.5-1.5 mm | Cold cracking within a season | Working middle | >= 6 N/50 mm | Predictable performance at a normal price.5-1.5 mm | Nothing to negotiate, nothing to explain.5-1.5 mm | Ceiling | >= 6 N/50 mm | Best performance, highest cost.5-1.5 mm | Cost the end product may not recover.5-1.5 mm |
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The figure that decides the outcome is not peel strength itself but the tolerance around it. A supplier who quotes >= 6 N/50 mm without a tolerance has not quoted a specification, and the first lot will define the tolerance for you.
How to measure peel strength
The reference method here is Abrasion , run to ISO 12947-2 Martindale, with an acceptance of >= 20 000 cycles.
Measure on the goods as delivered, not on the greige or the pre-finished material. The figure that matters is the one in the product your customer receives.
A marginal pass on peel strength tells you the process is running at the edge, which is the information you need before the next lot rather than after it.
The clause to write for peel strength
Peel strength appears with a tolerance and a test, not as a standalone number.
Backing: range, tolerance and the clause
For PU leather, the working range is knitted / woven / non-woven .
How to choose a backing option
| Option | What it changes in PU leather | When it is the right choice | knitted | The lowest-cost option in the family. Peel failure at seams is where it usually ends up. | Cost-led programmes with a short service life.5-1.5 mm | woven | The volume middle: enough margin for process variation without paying for headroom the end product cannot use.5-1.5 mm | Most repeat programmes, and the safest default.5-1.5 mm | non-woven | The top of the family, where the process is controlled tightly enough to guarantee it.5-1.5 mm | A warranty, a tender, or a specification that cannot be renegotiated.5-1.5 mm |
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Backing is chosen by the application rather than by price, and a supplier who quotes one option as if it were interchangeable with another is quoting a different product.
The figure that decides the outcome is not backing itself but the tolerance around it. A supplier who quotes knitted / woven / non-woven without a tolerance has not quoted a specification, and the first lot will define the tolerance for you.
How to measure backing
The reference method here is Hydrolysis (ageing) , run to 70 C / 95 % RH, 7 days, with an acceptance of no tackiness, >= 80 % peel retained.
A marginal pass on backing tells you the process is running at the edge, which is the information you need before the next lot rather than after it.
The clause to write for backing
Backing appears with a tolerance and a test, not as a standalone number.
Thickness on PU leather: range, tolerance and the clause
What 0.5-1.5 mm does not tell you
| Position | Value | Effect on PU leather | Where it shows up | Floor | 0.5 | Lowest cost, least margin for process variation.5-1.5 mm | Hydrolysis within a season | Working middle | 0.5-1.5 mm | Predictable performance at a normal price.5-1.5 mm | Nothing to negotiate, nothing to explain.5-1.5 mm | Ceiling | 1.5 mm | Best performance, highest cost.5-1.5 mm | Cost the end product may not recover.5-1.5 mm |
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The figure that decides the outcome is not thickness itself but the tolerance around it. A supplier who quotes 0.5-1.5 mm without a tolerance has not quoted a specification, and the first lot will define the tolerance for you.
How to measure thickness on PU leather
The reference method here is Peel strength , run to ISO 2411, with an acceptance of >= 6 N/50 mm.
Measure on the goods as delivered, not on the greige or the pre-finished material. The figure that matters is the one in the product your customer receives.
A marginal pass on thickness tells you the process is running at the edge, which is the information you need before the next lot rather than after it.
The clause to write for thickness on PU leather
Thickness appears with a tolerance and a test, not as a standalone number.
PU leather, 1.0 mm +/- 0.05, knitted backing, peel >= 8 N/50 mm, hydrolysis-resistant, 30 000 Martindale, cold flex -20 C 30 000 cycles, release-paper grain, Pantone 19-1016 TCX
Abrasion: range, tolerance and the clause
Seat and bag applications; below 10 000 the surface goes shiny then breaks.
For PU leather, the working range is >= 20 000 Martindale cycles .
What >= 20 000 Martindale cycles does not tell you
| Position | Value | Effect on PU leather | Where it shows up | Floor | >= 20 000 Martindale cycles | Lowest cost, least margin for process variation.5-1.5 mm | Hydrolysis within a season | Working middle | >= 20 000 Martindale cycles | Predictable performance at a normal price.5-1.5 mm | Nothing to negotiate, nothing to explain.5-1.5 mm | Ceiling | >= 20 000 Martindale cycles | Best performance, highest cost.5-1.5 mm | Cost the end product may not recover.5-1.5 mm |
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The figure that decides the outcome is not abrasion itself but the tolerance around it. A supplier who quotes >= 20 000 Martindale cycles without a tolerance has not quoted a specification, and the first lot will define the tolerance for you.
How to measure abrasion
The reference method here is Colour fastness to rubbing , run to ISO 105-X12, with an acceptance of >= grade 4.
Measure on the goods as delivered, not on the greige or the pre-finished material. The figure that matters is the one in the product your customer receives.
A marginal pass on abrasion tells you the process is running at the edge, which is the information you need before the next lot rather than after it.
The clause to write for abrasion
Abrasion appears with a tolerance and a test, not as a standalone number.
How to write a PU leather specification that protects you
For PU leather, the clause has to pin peel strength and hydrolysis resistance, because those two separate a compliant lot from an adequate one:
PU leather, 1.0 mm +/- 0.05, knitted backing, peel >= 8 N/50 mm, hydrolysis-resistant, 30 000 Martindale, cold flex -20 C 30 000 cycles, release-paper grain, Pantone 19-1016 TCX
PU leather: where the specification usually breaks down
The first failure is hydrolysis . The surface turns tacky and peels after months in a hot, humid warehouse or in service. The cause is usually ester-based pu plus moisture plus heat. it is a chemistry problem, not a coating weight problem. The test that exposes it before you order: 70 C / 95 % RH for 7 days, then peel strength and hand assessment.
The second is peel failure at seams . The skin lifts along stitch lines and fold edges. It comes from low coating weight, poor primer, or a non-woven backing that delaminates first. Test with ISO 2411 on a sewn and flexed sample.
What to put in a PU leather enquiry
- End use and the conditions, which together decide where peel strength has to sit inside >= 6 N/50 mm.
- The one figure that must hold, with peel strength named as the proof.
- Quantity per colour and per delivery, against a typical MOQ of 500-1000 m per colour.
- Destination market, because compliance changes the construction, not just the paperwork On PU leather that is thickness at 0.5-1.5 mm.
- A physical standard viewed under a stated light source, not a screen proof For PU leather it is backing at knitted, woven or non-woven that settles it.
Full ranges sit on the PU leather page , and the manufacturing side of the same question is on our quality control page .
Questions buyers ask before ordering
Is 0.5-1.5 mm a limit or a typical value for leather specification explained?
On leather specification explained, it depends on 0.5-1.5 mm and on the end use.
What is the actual tolerance behind leather specification explained?
On leather specification explained, not below 0.5-1.5 mm without a surcharge: the lamination time does not shrink with the order, so small volumes carry the same setup.
Can you hold tolerance at 0.5-1.5 mm for leather specification explained on a repeat order?
On leather specification explained, the limit is 0.5-1.5 mm.
PU leather: failure modes worth a clause in the purchase order
| Failure | What triggers it | Test to demand on the production lot | Hydrolysis | Ester-based PU plus moisture plus heat. It is a chemistry problem, not a coating weight problem.5-1.5 mm | Peel strength — ISO 2411; acceptance >= 6 N/50 mm.5-1.5 mm | Peel failure at seams | Low coating weight, poor primer, or a non-woven backing that delaminates first. | Hydrolysis (ageing) — 70 C / 95 % RH, 7 days; acceptance no tackiness, >= 80 % peel retained.5-1.5 mm |
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The other two, with acceptance numbers attached, are in the full failure analysis for PU leather .
Ready to fix 0.5-1.5 mm in writing before the leather specification explained sample?
For leather specification explained, send 0.5-1.5 mm with container count and destination market; the reply states the band we hold, the price at that volume and the test report.
Related reading
- PU leather: Four Failures Buyers Report, and the Tests That Catch Them
- What Pu Leather Really Costs: A Line-by-Line Breakdown
- Pu Leather for Automotive trim: Specification and Failure Risk
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