Your basic categories are:
Glass fibers-Silica, German silica, ecowool, etc
Ceramic fibers-Nextel
Organic fibers-Cotton ball is good, cotton strings, yarns, hemp, etc
Porous Ceramic-Aluminum Oxide (must DIY), fc2000?, etc
SS Mesh
Metal foams- Nickel Foam? Didn't keep up with that thread
Have...