Polypropylene (PP) (Used in molded caps with a thin penetration point, such as snap caps or snap plugs.) 0°C - 135°C: Acetone, ethyl acetate, methanol, isobutyl alcohol, methanol, and methyl ethyl ketone: cyclohexane, ethers, dichlorobenzene, pentanes, methylene chloride, and trichlorobenzene: For one time use only, not resealable.