Glossary

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Vinyl - A chemical derived from ethylene and used as a basic material for plastics that are typically tough, flexible, shiny and often used for coverings and clothing.

Visco-cel - A family of medium to high density, viscoelastic polyurethane foams manufactured by Rubberlite, Inc. These foams exhibit excellent memory retention (return to its initial form after compression) and can be cut to a custom thickness.

Viscoelastic - A term describing a urethane foam where the material will return to its initial form or state after deformation or compression.

Void (hole) - An unintentional cavity occurring in a cellular rubber product. It is usually circular in appearance, medium to large in size and goes completely through the material.

Volara® - A cross-linked polyethylene foam manufactured by Voltek. It is extruded to thickness in continuous roll form.

Volextra® - A product manufactured by Voltek. It combines the properties of Volara with the added benefit of a wide range of extrusion coated surfaces on one side, two sides or in between the foam. Volextra® provides enhanced performance, processing and decorative features to meet new surface and structural requirements with a lightweight foam material.

Vulcanization - An irreversible process during which a rubber compound, through a change in its chemical structure, e.g. cross-linking, becomes less plastic and more resistant to swelling by organic liquids. The result is that elastic properties are improved or extended over a wide range of temperatures. Vulcanization can be carried out under numerous conditions but it usually involves heat.