Testing acc. to ISO 3378: Leather - Physical and mechanical tests; Determination of resistance to grain cracking and grain crack index
Material
Industry
Publisher
Testing methods
Our test laboratory performs testing according to DIN EN ISO 3378 under an accredited procedure for the determination of the resistance of leather to grain cracking and grain bursting, as well as for the determination of the grain crack index. The test is particularly intended for heavy leathers and evaluates the behaviour of the grain surface under mechanical stress.
Test procedure
For the test, leather specimens are clamped in a standardized testing device and deformed under specified conditions. The applied stress is increased continuously until grain cracking or grain bursting occurs. Based on the recorded data, resistance values and/or the grain crack index are determined.
Applications
The test is used for heavy leathers such as sole leather, technical leathers, belt leather, strap leather and other leather products subjected to high mechanical loads. It is particularly relevant where leather is exposed to bending, stretching or forming stresses and where the integrity of the grain surface is critical to the functional performance or quality of the product.
