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. 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 Blue nuts, 20 x washers, 20 x bolts M4 x 40mm, Pan Head Screw, Water Resistant, Anti-Corrosion, Chemical Resistant, Electrical Insulator, Strong. 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.