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Viton™ VC-7
Viton™ VC-7 is a curative required for use with the G-types of peroxide-curable Viton™ fluoroelastomers.
Viton™ VC-7, known as Diak™-7, is a reactive polyfunctional triazine cogent used with G-type peroxide-curable fluoroelastomer compounds. The Viton™ G-family of fluoroelastomer mixes cannot be cured with peroxide; the process requires a curative coagent. In combination with peroxide, Viton™ VC-7 fluoroelastomer curing agent provides excellent tensile properties and high-temperature compression set resistance. The typical usage level for Viton™ VC-7 is 2.5 to 4 phr.
Viton™ VC-7 fluoroelastomer curative serves a different formulation purpose than the other Viton™ curing agents. Unlike VC-1 and VC-3 diamines that help the A-, B-, and E-types of Viton™ fluoroelastomers, Viton™ VC-7 is specialized for G-types as the suggested curative for all Viton™ GF-200S compounds. Viton™ VC-7 has a melting point that can be either solid or liquid, depending on the storage conditions. Viton™ VC-7 can be blended with a filler, additional polymer additives, and polymer resin such as FKM (fluoroelastomer), ACM (alkyl acrylate copolymer), AEM (ethylene acrylic rubber), and ECO (Epichlorohydrin rubber).
Specifications
Physical Form: Liquid above 27 °C (81 °F) Appearance: Straw yellow Odor: Pungent Specific Gravity: 1.16 ± 0.02 Melting Point: 25 ± 2 °C (77 ± 4 °F) Solubility: Slightly soluble in water; soluble in benzene, ethyl alcohol, acetone, and heptane
Primary Chemistry: Triallyl isocyanurate containing a small amount of a hydroquinone inhibitor for storage stability
Features & Benefits
Excellent tensile properties High compression set resistance Low melting point Fast cure and short cycles Compatible with FKM (fluoroelastomer), ACM (alkyl acrylate copolymer), AEM (ethylene acrylic rubber), and ECO (Epichlorohydrin rubber)
Problems Solved
Difficulties curing FKM and H-family copolymers with only peroxide curing agents Insufficient tensile properties in fluoroelastomers with traditional curing agents Lack of chemical resistance and scorch safety
Applications
G-type fluoroelastomer compounds Cross-linking agent Coagent for FKM and FFKM polymers
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