PP material is polypropylene, polypropylene is a non-toxic, odorless, 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. It is particularly stable to water, the water absorption rate in water is only 0.01%, and the molecular weight is about 80,000 to 150,000. Good formability, but due to large shrinkage (1%~2.5%). Thick-walled products are easy to dent. For some parts with high dimensional accuracy, it is difficult to meet the requirements, and the surface gloss of the product is good.
Polypropylene, a plastic, is a high-density, side-chain-free, highly crystalline linear polymer with excellent comprehensive properties. Common products: basins, barrels, furniture, films, woven bags, bottle caps, car bumpers, etc.
PP plastic, the chemical name is polypropylene, the English name is Polypropylene (referred to as pp), the specific gravity is 0.9-0.91 g/cm3, the molding shrinkage rate is 1.0-2.5%, and the molding temperature is 160-220 ° C. PP is a crystalline polymer, and the comprehensive performance of PP is better than that of PE. PP products have light weight, good toughness and good chemical resistance. Disadvantages of PP: low dimensional accuracy, insufficient rigidity, poor weather resistance, it has the phenomenon of post-shrinkage, and after demolding, it is easy to age, become brittle, and easy to deform. In daily life, the commonly used fresh-keeping boxes are made of PP materials.