As the global demand for high quality leather expands, quality control specialists use International Standards to determine, test, and evaluate the various physical and chemical properties of raw leather. This will assist in determining if the raw material meets International Standard specifications and adheres to quality standards. The raw leather inspection tests are conducted during the pre-production, production, and pre-shipment stages of manufacturing.
Key parts of the QC process for raw leather in China include:
Standard Test for Measuring the Relative Stiffness of Raw Leather
One of the standard tests developed by ATSM is the ASTM D2821 – 09, which is also called as the standard test method for measuring the relative stiffness of leather. This test method aims to determine the relative stiffness of raw leather, is commonly required by leather glove manufacturers from their suppliers. It is learned from experience that the torsion modulus of leather is directly associated to the stiffness felt when in a glove. By aiming to pass this test, raw leather factories are able to improve their production lines and meet the requirements of their customers. They may also use this test as a way to bolster their standing as a provider of high quality raw leathers.
Physical and Mechanical Tests for the Determination of Thickness of Leather
An ISO quality control standard test is ISO 2589:2002 (IULTCS/IUP 4) or the physical and mechanical tests for the determination of thickness of leather. This test provides a method for establishing the thickness of leather. The measurement is valid for both test samples and the whole leather.
The American Society for Testing and Materials (ATSM) and International Standards Organization (ISO) are just two of the organizations which are responsible for developing tests and standards aimed to assist both raw leather manufacturers and consumers in grading the quality of the raw material.