Viton™ Dipolymers A-Type Fluoroelastomer

black rubber hydraulic and pneumatic o-ring seals

Fluoroelastomers with Enhanced Properties

The Viton™ A-type family of fluoroelastomers are dipolymers comprised of hexafluoropropylene (HFP) and vinylidene fluoride (VF₂). They are used in a wide range of extrusion, injection molding, and solution coating applications, and some grades act as effective curing chemicals and metal adhesion promoters.

Typical products that use Viton™ A-type fluoroelastomers include:

O-rings
Valve stem and shaft seals
Parts with complicated shapes
Fuel hoses and tubing
Solution coatings for fabrics, tanks, and chemical containers

Features and Benefits

All Viton™ A-type fluoroelastomers offer temperature and chemical resistance, but different grades may also provide additional benefits, such as:

Lower viscosity
Faster cure rate
Less mold fouling
Improved mold flow and release
Improved compression set resistance and tear properties

Safety Data Sheets

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Viton™ A-Type Fluoroelastomers

Product Type	Nominal Viscosity, ML1 + 10 at 121 °C (250 °F)	Polymer Fluorine Content, % Gravity	Product Description	Suggested Uses/Applications
A-Types: Curative-Containing Precompounds
A-201C	20	66	Fast cure rate, excellent injection molding rheology, mold release	Injection molding, O-rings, gaskets, extruded shapes
A-331C	30	66	Excellent mold flow, high elongation/tear resistance	Compression and injection molding of complex shapes, requiring maximum hot tear
A-361C	30	66	Excellent mold flow, tear resistance, bonding to metal inserts	Compression and injection molding of complex shapes, bonded metal inserts
A-401C	40	66	Excellent rheology at high shear rates, excellent resistance to compression set	Compression, transfer, or injection molding of O-rings
A-601C	60	66	High viscosity, high state of cure; optimum resistance to compression set	Compression molding of O-rings, simple shapes
A-Types: Gum Polymers
A-100	10	66	Ultra-low viscosity: excellent polymer rheology	Coatings, viscosity modifier for higher viscosity types
A-200	20	66	Low viscosity: excellent polymer rheology	Cured with VC-50: injection molding applications
A-500	50	66	Intermediate viscosity: excellent polymer rheology	Cured with VC-50: compression, transfer, injection molding
A-700	70	66	High viscosity: excellent physical properties	Cured with VC-50: compression, transfer, injection molding
A-HV	160	66	Ultra-high viscosity: excellent physical properties	Cured with VC-50: compression molding, high strength vulcanizates