Abstract
Expanded flexible closed cell rubber produced by a free blown process began to be widely used about fifteen years ago as pipe and duct work insulation. This closed cell crosslinked rubber foam has a somewhat unique combination of properties that include ex cellent flex life, good weathering and chemical resistance and low permeability to moisture. This resilient foam rubber is useful in a range of applications including gasketing and cushioning. Certain formulation and processing techniques are peculiar to free blown expanded rubber. This article considers industry specifications and performance parameters for this class of materials. Properties pertinent to insulation application are discussed with emphasis on MVT and K factors.
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