Recycled plastic particles are crystalline polymers. PP particles are very light in common plastic particles, and the density is only 0. 91 g / cm3, less than water. Among the common plastic particles, PP plastic particles have good heat resistance, and their thermal deformation temperature is between 80-100 ℃, which can be boiled in boiling water, and the molding temperature is between 160-220 ℃. The specific gravity of PP particles is 0. 9 g to 0 per cubic centimeter. 91 grams per cubic centimeter, forming shrinkage between 1% and 2%. 5%。 PP particles have good stress cracking resistance and high bending fatigue life. The comprehensive properties of PP particles are better than that of PE particles. PP plastic particles have light weight, good toughness and good chemical resistance.