لفائف البولي بروبيلين البلاستيكية – مورد رول PP الرخيص بالجملة

The pp material is polypropylene. Polypropylene is a non-toxic, odorless and tasteless milky white highly crystalline polymer with a density of only 0.90–“0.91g/cm3, which is currently one of the lightest varieties of all plastics . It is particularly stable to water, with a water absorption rate of only 0.01% and a molecular weight of about 80,000 to 150,000. The moldability is good, but because of the large shrinkage rate (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 of the products has good gloss.

PP polyester is a kind of amorphous, its melting point should be above 220, and its heat distortion temperature should be about 121 degrees, but because it is a macromolecular polymer after all, the higher the temperature, the more likely the small analytical oligomers to precipitate Most of these substances are not good for human health, and according to the customer’s use, the general boiling water is 100 degrees, so the general plastic cups will not be labeled with more than 100 degrees.
Polypropylene, a kind of plastic, is a linear polymer with high density, no side chains, and high crystallinity. It has excellent comprehensive properties. Common products: basins, barrels, furniture, films, woven bags, bottle caps, car bumpers, etc.

pp plastic, chemical name: polypropylene English name: Polypropylene (abbreviated as pp) Specific gravity: 0.9-0.91 g/cm3 Molding shrinkage: 1.0-2.5% Molding temperature: 160-220℃ PP is a crystalline polymer, PP is Comprehensive performance is better than PE material. PP products have light weight, good toughness, and good chemical resistance. Disadvantages of PP: low dimensional accuracy, insufficient rigidity, poor weather resistance, it has post-shrinkage phenomenon, after demolding, it is easy to age, become brittle, and easy to deform. In daily life, the commonly used fresh-keeping box is made of PP material.