Teflon® PFA  445 HP - DuPont Fluoropolymers - 

Teflon® PFA 445 HP is a special-purpose resin available in clear, 2.5-mm (0.1-in.) pellets. This resin is a chemically modified form of Teflon® PFA 345 that combines many of the benefits of the parent resin with several new ones. Like Teflon® PFA 345, it offers great flex life and resistance to environmental stress cracking. The additional benefits are enhanced purity and improved thermal stability while processing.

The enhanced purity of Teflon® PFA 445 HP makes it suitable for applications that require improved color, lower extractable fluorides, and freedom from other foreign materials. This product contains no additives and is designed for hostile chemical environments where purity in the parts-per-billion range is needed. Examples are in semiconductor manufacture, fluid handling systems for industry or life sciences, and instrumentation of precise measurements of fluid systems.

The improved thermal stability of Teflon® PFA 445 HP results in reduced amounts of bubbles in final parts and decreased corrosion of processing equipment. This resin can be processed at higher temperatures and higher rates than Teflon® PFA 345. Teflon® PFA 445 HP combines the processing ease of conventional thermoplastics with properties similar to those of polytetrafluoroethylene.

Properly processed products made from neat Teflon® PFA 445 HP resin provide the superior properties typical of the fluoropolymer resins: retention of physical properties after service at 260°C (500°F), useful properties at -196°C (-320°F), and chemical inertness to nearly all industrial chemicals and solvents. Dielectric properties are excellent. Molded products have moderate stiffness and high ultimate elongation.

In a flame situation, products of Teflon® PFA 445 HP resist ignition and do not themselves promote flame spread. When ignited by flame from other sources, the contribution of heat is very small and added at a slow rate with very little smoke.