Viton^™ B-type gum polymers are terpolymers consisting of VF2, HFP, and TFE monomers and do not contain a curative. They need to be cross-linked or cured with a diamine or bisphenol curative to obtain the final vulcanizate. Viton^™ B-type gum polymers contain 66.0%–69.5% fluorine and offer improved processing and extrusion performance, increased mold flow, and good mold release. Viton^™ B products are used in applications that need improved processing properties and rheology. They are typically used to mold complex shapes and for extrusions and coatings of fabrics, tanks, or chemical containers. The product range can be blended with other Viton^™ types to modify viscosity and improve flow.