GB/T 39370 - 2020 is for the determination of leather surface reflection performance, covering physical and mechanical tests. It regulates the selection and preparation of leather samples to ensure representativeness. Clarify the accuracy and technical requirements of the required test instruments, and elaborate the measurement process of surface reflection performance, including Light source setting, Measurement angle, data collection and other key links. Through this standard, leather surface reflectance and other data can be accurately obtained, providing the basis for leather product Appearance design and mass inspection, and helping to improve the visual effect and quality of leather products.