Bob3
Contributor
There are some fairly decent plastics on the market, my favorite way to test is to stick them in the freezer for a couple of hours & then smack briskly with a 4 lb hammer.
If they survive, you can test further by doing the "burn test" where you set it on fire & look closely for the glass reinforcing fibers that should be in the ash.
If they survive, you can test further by doing the "burn test" where you set it on fire & look closely for the glass reinforcing fibers that should be in the ash.