What is the bottle cap

①Safety cover
Beer bottle caps are called safety caps. Bottle caps are an important part of food and beverage packaging, and are also the first place where consumers come into contact with products. Bottle caps have the ability to maintain the airtightness of the contents of the product, as well as the functions of anti-theft opening and safety, so they are widely used in bottled products. Therefore, bottle caps are upstream industries in the food, beverage, alcohol, chemical, and pharmaceutical industries
②It's silicone. Silica gel is a highly active adsorption material, belonging to the amorphous state, and its chemical molecular formula is mSiO2 · nH2O. It is insoluble in water and any solvent, non-toxic and odorless, with stable chemical properties, and does not react with any substance except strong bases and hydrofluoric acid.