There are many kinds of properties of pp materials. The first is physical properties. Polypropylene (PP) is a non-toxic, odorless, odorless, milky white, highly crystalline polymer with a density of only 0.90~.091g/cm3, which is present in all plastics. One of the lightest breeds. It is particularly stable to water, with a water absorption rate of 0.01% in water for 24 hours and a molecular weight of about 8 to 150,000. Good moldability, but due to high shrinkage, thick-walled products are easily sag. (PP) products have good surface gloss and are easy to color. The second is mechanical properties. Polypropylene (PP) has high crystallinity and structural regularity. Therefore, it has excellent mechanical properties. Its strength, hardness, and elasticity are all higher than those of HDPE, but at room temperature and low temperature, due to its own molecular structure. Since the degree of regularity is high, the impact strength is poor, and when the molecular weight is increased, the impact strength is also increased, but the molding processability is deteriorated.

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