PP material (polypropylene) is a kind of plastic, which is a kind of linear polymer with high density, no side chain and high crystallization necessity, and has excellent comprehensive properties. Polypropylene is a non-toxic, odorless and tasteless milky white polymer with high crystallization. Common products: Basin, barrel, furniture, film, laminated pp woven bag, bottle cap, car bumper, etc.
The comprehensive performance of PP is better than that of PE material. PP products are light in weight, good in toughness and good in chemical resistance. Disadvantages of PP: low dimensional accuracy, insufficient rigidity and poor weather resistance. It has the phenomenon of back contraction. After demoulding, it is easy to age, become crisp and deform. In daily life, the commonly used fresh-keeping box is made of PP material.
Polypropylene is a non-toxic, odorless and tasteless milky white high crystalline polymer with a density of only 0. 90-“0. 91g/cm3”, which is one of the lightest varieties of all plastics at present. It is particularly stable to water, and its water absorption rate in water is only 0. 01%. Good formability, but thick-wall products are easy to sag. For some parts with high dimensional accuracy, it is difficult to meet the requirements and the surface of the products is good.