How to Test Leather Quality: 10 Common Leather Testing Methods for Brands and Manufacturers

First published: May 2026

Whether you're sourcing leather for footwear, fashion accessories, or upholstery, leather quality tests give brands and manufacturers the results they need to verify supplier claims, meet regulatory requirements, and protect their reputation in competitive markets.

This guide explains how to test leather quality using the ten most widely used leather testing methods, from visual checks to advanced chemical analyses, so you can build a testing programme that ensures leather quality and compliance.

If you are looking for leather testing services, please contact us here directly.

The 10 most common leather quality tests

Visual and sensory inspection

Trained inspectors examine the leather surface for grain consistency, colour uniformity, scars, insect bites, wrinkles, and finishing defects. They also assess the hand feel, such as softness, suppleness, and thickness, to confirm the material matches the approved sample.

Brand impact

Visual inspection catches cosmetic defects before they reach production, reducing waste and rework costs. While subjective, it remains the fastest and most cost-effective first-pass quality gate.

Method

Typically performed under standardised lighting (D65 daylight equivalent) against an approved reference swatch. Many brands use a four-point grading system to classify defects by severity.

Tensile strength testing

Tensile strength measures how much force leather can withstand before it tears. A dumbbell-shaped specimen is clamped into a tensile testing machine and pulled at a constant rate until failure. The test records both the maximum force (in Newtons) and the elongation at break (as a percentage).

Brand impact

This is the single most important indicator of structural durability. Durability testing for leather used in shoes, bags, and belts must confirm that the material resists the repetitive stresses of daily use without splitting.

Key standards

ISO 3376 (IULTCS/IUP 6) for tensile strength and percentage extension, and ISO 3377-1/3377-2 for tear strength of leather.

Abrasion resistance testing

Abrasion testing simulates the wear leather endures from friction, such as rubbing against surfaces, other materials, or skin. The most common method uses a Martindale or Taber abrader, which rotates an abrasive material against the leather surface under a set load for a specified number of cycles.

Brand impact

For upholstery, automotive seating, and footwear linings, abrasion resistance directly predicts how long the leather will look and perform as intended. Poor abrasion performance leads to surface loss, colour transfer, and premature ageing.

Key standards

ISO 17076 (Martindale method for leather) and ISO 5470 (Taber method) are both widely referenced in brand specifications.

Colourfastness testing

Colourfastness tests determine how well leather retains its colour when exposed to light, rubbing, water, perspiration, and washing. Each has a dedicated test method, but the principle is the same by exposing the leather to the agent and then rating the colour change using a standardised grey scale.

Brand impact

Colour bleeding onto clothing, fading on display shelves, or discolouration from perspiration are among the most common consumer complaints. Failing colourfastness often leads to returns and warranty claims.

Key standards

ISO 2588:2014 (general principles of colourfastness testing), ISO 11640 (colourfastness to cycles of rubbing), ISO 105-B02 (colourfastness to artificial light), and ISO 15702 (colourfastness to machine washing).

Flex resistance (flexing endurance) testing

Flex testing replicates the repeated bending leather undergoes in shoes, jackets, and upholstered furniture. A specimen is clamped into a flexometer (such as the Bally Flex or Vamp Flex machine) and subjected to thousands (sometimes hundreds of thousands) of flex cycles. Inspectors then examine the surface for cracking, flaking, or delamination.

Brand impact

Leather that looks perfect on a shelf can crack after a few days of wear if the finish or tanning is inadequate. Flex resistance testing is critical for footwear uppers and any application involving repeated bending.

Key standard

ISO 5402-1 (flexing endurance using a flexometer) is the primary reference.

Water resistance and water absorption testing

These companion tests measure how leather responds to water. Water resistance testing (often using the Maeser or Bally Penetrometer) determines how many flex cycles it takes for water to penetrate through the leather. Water absorption testing measures the percentage of weight gained after immersion for a set time.

Brand impact

For outdoor footwear, gloves, and bags exposed to rain, understanding water behaviour is essential. High absorption can lead to stiffness, mould growth, and accelerated degradation, while good water resistance extends product life.

Key standards

ISO 5403-1 (water resistance of leather by the Maeser method) and ISO 2417 (water absorption).

Adhesion and finish peel strength testing

This test measures the bond strength between the leather surface coating (finish) and the underlying hide. A strip of adhesive tape or a bonded material is applied to the leather surface and then peeled away at a controlled angle and speed. The force required to separate the finish is recorded.

Brand impact

A weak finish bond leads to peeling, flaking, and bubbling. This test is especially relevant for pigmented and heavily finished leathers used in furniture and automotive trim.

Key standard

ISO 11644 (adhesion of finish — method using a flexing procedure).

Chemical safety testing (restricted substances)

Chemical testing screens leather for hazardous substances that are regulated or restricted by law. The most commonly tested substances include chromium VI (a carcinogen formed by oxidation during chrome tanning), formaldehyde, pentachlorophenol (PCP), azo dyes that release banned aromatic amines, and heavy metals.

Brand impact

Non-compliance with chemical regulations like EU REACH, CPSIA, or retailer-specific RSLs can block market access entirely. Beyond legal risk, chemical failures pose genuine health hazards to end consumers, particularly in products with prolonged skin contact, such as gloves, watch straps, and shoe linings.

Key standards

ISO 17075 (chromium VI determination), ISO 17226 (formaldehyde content), EN ISO 17234 (azo dye detection). Many brands also test against their own restricted substances lists (RSLs) and manufacturing RSLs (MRSLs).

Thickness and physical testing

Consistent thickness across a hide is critical for cutting efficiency, product uniformity, and mechanical performance. A calibrated thickness gauge measures the hide at multiple defined points, and the results are compared against the specification tolerance.

Brand impact 

Thickness variation affects stitching, adhesion, moulding, and overall product feel. In high-volume manufacturing, even small inconsistencies compound into significant waste and quality complaints.

Key standard

ISO 2589 (determination of thickness) specifies the measurement method and conditions.

Leather authenticity verification

With the growth of synthetic alternatives and the tightening of wildlife trade regulations, verifying that leather is genuine and identifying the animal species has become a standard part of many testing programmes. Microscopic examination of fibre structure and, increasingly, DNA-based testing methods are used to confirm species.

Brand impact

Labelling leather as "genuine" when it is bonded or synthetic violates consumer protection laws in most markets. Species verification also ensures compliance with CITES regulations and brand animal welfare policies.

Key standards

ISO 17131 (identification of leather by microscopy) provides the reference method for distinguishing genuine leather from other materials.

The importance of leather quality testing

Leather is a natural material, and no two pieces of leather are exactly alike. Even from the same supplier, variations in raw material, tanning chemistry, and finishing processes mean that quality can shift from batch to batch. Without robust testing for leather, brands risk shipping products that crack, fade, or release harmful substances after only a few months of use. Understanding how to test leather quality at each stage of the supply chain is the most reliable way to prevent these failures.

Beyond product performance, leather testing is increasingly a compliance issue. Regulations such as EU REACH and the US Consumer Product Safety Improvement Act (CPSIA) set strict limits on chemicals like chromium VI, formaldehyde, and azo dyes. Failing to test can result in costly recalls, import rejections, and lasting damage to brand credibility.

How does Eurofins Softlines & Hardlines support leather quality tests?

For brands that need a trusted laboratory partner, Eurofins Softlines & Hardlines provides end-to-end leather testing and verification services through its Competence Centre, the Eurofins | BLC Leather Technology Centre in Northampton, UK.

Our leather testing capabilities include:

• Chemical analysis for RSL and MRSL compliance against EU REACH, CPSIA, and client-specific requirements
• Physical and performance testing covering flexing, colourfastness, abrasion, tensile strength, and more
• Fault diagnosis to identify the root cause of field failures
• Leather verification to confirm genuine leather
• Species identification testing
• Supply chain mapping
• Vegan certification

Contact us today to discuss your leather testing needs.