1. Product classification 1. According to the mass per unit area, it is divided into 40g/m2-2000g/m2. 2 According to the width, it is divided into 20cm-500cm. 2. Raw material requirements Various raw materials should meet the requirements of corresponding standards. 3. Intrinsic quality requirements The intrinsic quality requirements of the product include breaking strength, breaking elongation, bursting strength, etc.