This standard specifies the terminology and naming principles for the leather industry's raw materials: leather, in-process products, finished leather, production processes, physical and chemical analysis and sensory inspection, leather defects, classification of leather and leather parts. This standard is applicable to the leather industry, and regenerated leather should also be adopted with reference. All standard setting, quality evaluation, enterprise management, technical exchanges, textbook compilation, etc. should be adopted. This standard does not apply to artificial leather and synthetic leather.