Viton™ VPA-1 is a general-purpose process aid supplied in powder form used in molding all types of Viton™ fluoroelastomers.
Chemours Viton™ VPA-1 is a sulfur-containing aromatic wax used as a general-purpose process aid in all types of Viton™ fluoroelastomers for various molding and extrusion processes. Viton™ VPA-1 is particularly effective on mills that have ineffective cooling. It also provides smooth and uniform compounds, especially in rod-type preforms.
Viton™ VPA-1 can be premixed with other compounding ingredients and added to a batch. It has little or no effect on processing safety but has a slight activating effect when cured at 177 °C (351 °F). A slight bloom might be noted on preforms and press-cured articles, which disappear during the oven post-cure.
Viton™ VPA-1 is typically recommended at a loading rate of 0.5–2.0 phr.
Physical form: Powder
Appearance: Light tan to white
Specific gravity: 1.26
Meltingpoint: 150 °C (302 °F)
Recommended level, phr: 0.5–2.0
Primary Chemistry: Wax / Aromatic sulfur compound
Good mill release
Smooth and uniform finish with rod-type preforms
Good mold release and heat resistance
Can be premixed with other compounding ingredients
No effect on vulcanizate properties
Outstanding chemical resistance
Versatility of elastomers process aids in all molding processes
Rough surface finishes and uniformity issues in the processing of rubbers and FKM polymers
Automotive
Oil and gas
O-rings, seals, and gasket rubber parts
Process aid in the molding of all types of fluoroelastomers, including FKM polymers
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