More economically suited for some markets, Low Density PTFE thread seal tape compliments our line of premium Poly-Temp® tapes. Still made with virgin PTFE, this tape remains flexible, is a thread sealant for all services, chemically inert, non-hardening and withstands temperature raenges between -400°F to 500°F. It is compatible with all pipe materials without exception, forms a permanent seal for the life of the connection, and is recommended for all pipe sizes (larger thread sizes require more wraps). for all pipe sizes.