The scientific name of PP engineering plastics is polypropylene. It is another excellent resin variety developed after nylon. It is a linear polymer with high density, no side chain and high crystallinity, and has excellent comprehensive properties. PP has good solvent resistance, oil resistance, weak acid resistance and weak alkali resistance. Polyoxymethylene has high hardness and rigidity, high creep resistance and stress relaxation ability, excellent wear resistance and self-lubrication, and its fatigue property is incomparable with other engineering plastics.

If the cup made of polypropylene is nontoxic, the processing temperature (℃) is 180 ~ 240. So boiling water won't decompose it.