DuPont Teflon® PTFE Grade 7B Granular Compression Molding Resin

Subcategory: Fluoropolymer; Thermoplastic; PTFE

Key Words: Polytetrafluoroethylene; DuPont Fluoroproducts

Material Notes:
DuPont™ Teflon® PTFE 7B is a white granulated powder with an ultra fine particle size and high bulk density. The ultra-fine particle size minimizes voids even at relatively low molding pressure. Teflon® PTFE 7B is an excellent choice for moldings requiring optimum mechanical and electrical properties. The ultra-fine particle size of Teflon® PTFE 7B promotes good capture and uniform distribution of inorganic fillers when they are added to modify the mechanical properties of moldings. Teflon® PTFE 7B exhibits a mold shrinkage that is intermediate of the mold shrinkage of 7A and 7C grades.

Properly processed products made from neat Teflon® PTFE 7B provide the superior properties typical of the fluoropolymer resins: retention of properties after service at 260°C (500°F), useful properties at –240°C (–400°F), chemical inertness to nearly all industrial chemicals and solvents, and low friction and antistick surfaces. Dielectric properties are outstanding and stable with frequency and temperature. Molded products have moderate stiffness and high ultimate elongation. In a flame situation, products of Teflon® PTFE 7B resist ignition and do not themselves promote flame spread. When ignited by flame from other sources, their contribution of heat is small and with very little smoke.

Statements, or data, regarding behavior in a flame situation are not intended to reflect hazards presented by this or any other material when under actual fire conditions.

Applications

Many end products are molded or fabricated from moldings of Teflon® PTFE 7B—or made with filled compounds based on Teflon® PTFE 7B. The filled compounds provide a wide choice of modified mechanical properties. End products using Teflon® PTFE 7B include skived film and sheet, gaskets, bridge or pipeline bearing pads, piston rings, and diaphragms.