Fluoroplastics are polymer materials. Data show that the higher the density of PTFE, the smaller the permeability coefficient, and there is a linear relationship between them. The density of fluoroplastics should be ≥2.16g/cm², and the raw materials with impurities are not allowed. The lining material used for food, medicine, and sanitary valves should also be non-toxic, sterile, and clean and hygienic without impurities. The surface of the fluoroplastic valve should be smooth and flat, free of defects such as pores, cracks, and inclusions. The flanges and other corners should be uniform in color without whitening. These standards have specific provisions, which are mainly based on user requirements and scientific verification.