PP ball is Polypropylene ball. Polypropylene is another excellent resin variety after nylon. It is a linear polymer of high density, no side chain and high crystalline, with excellent overall performance. PP balls can be used in about 100 degrees, because they have good electrical properties and high frequency insulation from humidity. But PP balls will become brittle, not easy to wear and easy to age in low temperature. And they are suitable for the production of general mechanical parts, corrosion-resistant parts and insulation parts. Common products as below: pots, barrels, furniture, film, woven bags, caps, car bumpers and so on.