The 7 most commonly used non-metallic materials

The seven most commonly used non-metallic materials in non-standard design, 80% engineers have not used, how many have you used?
1, POM, polyformaldehyde, commonly known as race cylinder, the reason why it is called race steel, mainly because of its high hardness, the surface of the material is more lubricated and wear-resistant.
2, polytetrafluoroethylene, plastic king Teflon is a kind of polymer material, high and low temperature resistance, very low friction coefficient, not easy to process, easy to deformation.
3, nylon, one of the more materials used in non-standard parts machinery, wear-resistant, self-lubricating, can be processed gear, bearings and other parts.
4, PVC, also known as polyethylene, cheap, widely used, there are PVC hard and soft materials, the general load is basically hard material.
5, polyurethane, PU, also known as superior rubber, has good oil resistance, toughness.
6, ABS, ABS plastic is a resin made of three monomers, a acrylonitylene b butadiene s styrene can be made of various resins with different content.
7, bakelite, with high mechanical strength, can be used for the use of tooling boards, but the mechanical properties are poor, the precision is not high after processing. What other nonmetallic materials do you know? Follow me for more mechanical knowledge.