| DuPont™ Teflon® PFA 440 HP fluoropolymer 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 340 that combines many of the benefits of the parent resin with several new ones. The additional benefits may include enhanced purity, improved thermal stability while processing, and chemical inertness, for example, to ozonated fluids. The enhanced purity of Teflon® PFA 440 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 for precise measurements of fluid systems. The improved thermal stability of Teflon® PFA 440 HP results in reduced amounts of bubbles in final parts and decreased corrosion of processing equipment. Teflon® PFA 440 HP combines the processing ease of conventional thermoplastics with properties similar to those of polytetrafluoroethylene. Properly processed products made from neat Teflon® PFA 440 HP resin provide the superior properties typical of fluoropolymer resins: retention of 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. Three categories (A, B, and D) of Teflon® PFA 440 HP resin covering a broad range of melt flow rates (MFR) are available. The low MFR resin provides a higher degree of stress crack resistance while the high MFR resin is easier to process. In a flame situation, products of Teflon® PFA 440 HP resist ignition and do not themselves promote flame spread. When ignited by flame from other sources, their contribution of heat is very small and added at a slow rate 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 Applications for Teflon® PFA 440 HP include tubing; unsupported pipe or pipe linings for production of ultrapure chemicals; semiconductor component and fluid handling systems for highperformance chemical filters. Chemours was formed from former DuPont performance chemicals businesses, including DuPont Fluoroproducts, in 2015. |
