DuPont Viton GLT-600S fluoroelastomer is a 64% fluorine, peroxide-cured, low temperature fluoroelastomer. GLT-600S utilizes the latest technology from DuPont, Advanced Polymer Architecture (APA), which includes a novel peroxide cure site along with an optimized molecular weight distribution. Features • Cures exceptionally fast to a high state of cure • Similar to improved low temperature properties compared to Viton GLT • Improved mold release/mold fouling properties • Improved mold flow and less shear sensitivity for a 65 Mooney peroxy cured FKM • Excellent physical properties with high elongation, both original and aged • Heat, fluids, and low temperature resistance comparable to Viton GLT • Improved water resistance / lower volume swell in water • Excellent compression set resistance with either low or no postcure
Processing A load factor of 72%+ for internal mixing of GLT-600S is preferred. The suggested process aids for GLT-600S are 0.75 phr of Struktol HT290 either alone or in combination with 0.5 phr of PAT-777, or combinations of 0.5 phr Armeen 18D with carnauba wax or Struktol WS280. The use of DIAK 8 is NOT suggested as it causes poor mold release and high compression set. DIAK7 (TAIC) is the suggested coagent for all GLT-600S compounds, and is usually used at a 3 phr level or lower unless high modulus is needed. High levels of TAIC can bleed out and cause molding flaws. A peroxide level of 1.5 to 2 phr is suggested for this fast curing FKM polymer. Safety and Handling Before handling or processing Viton GLT-600S, read and be guided by the suggestions in DuPont technical bulletin "Handling Precautions for Viton and Related Chemicals."
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