In MMD 980316 John Tuttle asks "What is Delrin?"

Delrin is a hard engineering grade plastic.  It is trademark of the
DUpont company.  The generic term is acetal homopolymer.  Don't ask me
what that means, I'm not a real expert.  Suggested applications include
bearings, bushes, gears, valves and valve seatings.

Typical properties:
Colour:                 White or black
Specific gravity:       1.42
Tensile strength:       70N/mm squared
Melting point:          175 degrees C
Flammability:           Slow burning

--
Jeffrey Borinsky