Plastic cups because of its varied shapes, bright colors, not afraid of beating properties, are enjoyed by many people, very suitable for outdoor users and office workers use. In General, plastic cups the bottom of the Cup has a label, is the number on the small triangle, a common "05" and represents the Cup material is PP (polypropylene). Glass has good heat resistance of PP material, melting point of 170 ¡æ ~172 ¡æ, are more stable chemical property, in addition to erosion by concentrated sulfuric acid and concentrated nitric acid, compare to other various chemical reagents are stable. But the problem of ordinary plastic cup is common. Plastics are polymer chemical materials, plastic cups when hot or boiling water, polymers are easy to precipitate dissolved in the water, after drinking is harmful to human health. Internal micro-structure there are many pore and plastics, which hides dirt, cleaning dirty breed bacteria. So use plastic cups for plastic material selection is very important, be sure to choose in line with national standards of food grade plastic. Or PP material.