How do I figure out what kinds of fabrics to use?

[AhnoldZ]

And the old standby, since manmade fiber is just plastic:

How to determine if plastic "x" is safe to use

There have been numerous posts asking if <insert name here> is safe to use in the GF. Good questions all, and certainly indicates that folks are thinking creatively! Plastics come in many different formulations, often making it difficult to know whether or not a specific type contains Chlorine – a big no-no. Not only can hydrogen chloride gas do horrendous things to the optics of your shiny new GF, it can be deadly. So, how to be certain that hunk of plastic is safe? George Gra…