Slippery at the molecular level, it does have a relatively high coefficient of friction. Polypropylene possesses good fatigue resistance. Does not break when repeatedly bent and Polypropylene is very resistant to absorbing moisture. Polypropylene has good chemical resistance over a wide range of bases and acids. Polypropylene has good impact strength. Polypropylene is a good electrical insulator 20 x Black nuts, 20 x washers, 20x bolts M4 x 20mm, Philips Pan Head Screw, Pantone 3C Black APPLICATIONS: Polypropylene is an economical material that offers a combination of outstanding physical, chemical, mechanical, thermal and electrical properties not found in any other thermoplastic.