Viton™ GFLT-200S* fluoroelastomer is a low viscosity  67% fluorine, peroxide-cured, low temperature  fluoroelastomer. GFLT-200S utilizes the latest  technology from Chemours, Advanced Polymer  Architecture (APA), which includes a novel peroxide  cure site along with an optimized molecular weight  distribution. 

Features 

• Is ideal for blending with Viton™ GFLT-600S to reach  intermediate viscosity ranges for injection and transfer  molding 

• Cures exceptionally fast to a high state of cure 

• Improved mold release/mold fouling properties  

• Improved mold flow and less shear sensitivity for a  25 Mooney peroxy-cured FKM 

• Good physical properties with high elongation, both  original and aged 

• Improved water resistance/lower volume swell in water  

• Excellent compression set resistance with either low  or no post-cure  

Processing  

A load factor of 72%+ for internal mixing of GFLT-200S  is preferred. The suggested process aids for GFLT-200S  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 TMAIC (trimethallyl isocyanurate)  is NOT suggested, as it causes poor mold release and high compression set. Viton™ Curative No. 7 (VC-7) is the  suggested coagent for all GFLT-200S compounds and  usually used at a 3 phr level or lower, unless high modulus  is needed. High levels of VC-7 can bleed out and cause  molding flaws. A peroxide level of 1.5–2 phr is suggested  for this fast-curing FKM polymer.