Milk bottles are plastics made from polymers manufactured from synthetic resins, and the bottles for milk now on the market are HDPE plastics. \x0d\plastic is a monomer as raw material, through the polymerization or polycondensation reaction polymerization of polymer compounds, its resistance to deformation of the ability of the medium, between the fiber and rubber, by the synthetic resins and fillers, plasticizers, stabilizers, lubricants, color and other additives. The main component of plastic is resin. Resin is a polymer compound that has not yet been mixed with various additives. \x0d\ More about what kind of plastic milk bottles are, go to: /ask/8a20531615827082.html?zd to see more content