The physical properties of PP (polypropylene): the polypropylene is non-toxic, odorless, tasteless milky white high crystallinity polymer, density is only 0.90 ~ 0.91g/cm3 is currently one of the lightest of all plastic varieties. It on the water stability, in the 24 hours of water absorbent rate was only 0.01%, molecular weight between about 8 to 15 million. Good formability, but due to shrinkage rate, thick wall products easy to sag. Product surface gloss, easy coloring.