What is food grade pp plastic?

Polypropylene (PP plastic) develops another excellent resin variety after nylon. It is a high density, no side chain, high crystalline linear polymer with excellent properties.Food grade pp plastic comprehensive performance: white translucent when not colored, waxy; lighter than polyethylene. Transparency is also better than polyethylene and harder than polyethylene.Food grade pp plastic common products: pots, barrels, furniture, film, woven bags, caps

Food grade pp plastic forming performance 

Includes propylene and a small amount of ethylene copolymer. PP pellets are natural color, cylindrical particles, and the particles are smooth. The size of the particles is 2mm~5mm in any direction, odorless, non-toxic, and free of mechanical impurities. This product uses high-purity propylene as the main raw material, ethylene as comonomer, and high-activity catalyst to produce polypropylene powder by gas phase reaction at 62 ° C ~ 80 ° C and below 4.0 MPa, and then dried, mixed, Extrusion, granulation, sieving, and homogenization into food grade pp plastic granules.

Food grade pp plastic chemical and physical properties

It is a semi-crystalline material. It is harder and has a higher melting point than PE. Since the PP temperature of the homopolymer type is very brittle when it is higher than 0 °C, many commercial PP materials are random copolymers of 1 to 4% ethylene or a clamp copolymer of a higher ratio of ethylene. The copolymer type PP material has a low heat distortion temperature (100 ° C), low transparency, low gloss, and low rigidity, but has stronger impact strength. The strength of PP increases as the ethylene content increases. The Vicat softening temperature of PP is 150 °C. Due to the high degree of crystallinity, the surface stiffness and scratch resistance of this material are very good. 

The above is a brief summary of what food grade pp plastics are.