Start with Dupont Zytel and work from there. Note there are a lot of different resins within a family that have different properties.

https://www.dupont.com/products-and...plications/automotive-engine-covers.html

This link shows the number of resins in the Zytel family:

https://dupont.materialdatacenter.com/profiler/1WeV0/


1972 Dodge Challenger