The difference between raw materials with raw materials :
PVC :Generally pvc are transparent , it also has black and white .The surface has a little blue light,and it will has white line after folding .
PET : High transparent ,it is more white in the surface ,high degradability,it can meet the food directly .
PS :Generally are white and black , poor toughness , it is easier to tear .
PP:Food grade , High temperature and low temperature resistance .