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Low Melt Flow PFA 451hpx Resin for Semiconductor Tubing and Pipe Linings. Ultra Low Extractables Performance Satisfy parts per billion purity demands for semiconductor and high purity chemical manufacturing. Excellent Surface Smoothness: Minimize spherulite size to achieve smooth surface for tubing and lining finished parts. Enhanced Chemical Permeation Resistance: Higher crystallinity blocks chemical penetration for aggressive corrosive working environments. Superior Stress Crack Resistance: Resist thermal and mechanical stress for long service life in hostile chemical processing conditions. Multi Processing Compatibility Supports injection, extrusion, compression, transfer and blow molding for diverse high purity fluid components.