Viton™ GBL-200S* fluoroelastomer is a next generation,  easy processing, low viscosity, peroxide cured 68%  fluorine fluoroelastomer based on new Advanced  Polymer Architecture technology. Compared with the  original Viton™ GBL-200, Viton™ GBL-200S shows better  processability coupled with similar or improved fluids  resistance in aromatic hydrocarbons, alcohols, water,  steam, and acids. 

Features 

• Is ideal for blending with Viton™ GBL-600S to reach  intermediate viscosity ranges 

• Cures exceptionally fast to a high state of cure 

• Exhibits improved mold release/mold fouling properties  compared with Viton™ GBL-900 and Viton™ GBL-200 

• Exhibits improved mold flow and less shear sensitivity  than 65 Mooney Viton™ GBL-600S 

• Exhibits excellent physical properties with high  elongation, both original and aged compounds 

• Exhibits similar heat, fluids, and low temperature  resistance compared with Viton™ GBL-200 

• Exhibits excellent compression set resistance with  little (2 hr) or no post-cure  

Processing  

A load factor of >70% for internal mixing of Viton™ GBL-200S is recommended. The recommended process  aids for Viton™ GBL-200S are 1 phr of Struktol® HT  290, combinations of 0.5 phr Armeen® 18D with carnauba wax, or Struktol® WS 280. Viton™ Curative  No. 7 (VC-7) co-agent is recommended for all Viton™ GBL-200S compounds. Used at a level of 2.5 phr or less  is satisfactory, unless high modulus is needed. At higher  levels, VC-7 can bleed out and cause molding flaws.