Abstract: A novel expandable composition and method for using the same are disclosed. The disclosed method relates to using the composition, for example, as an automotive cavity sealant. The inventive composition normally is a combination of at least one base polymer, at least one expansion or blowing agents, at least one hydrocarbon resin, at least one curing agent or catalyst and optionally at least one additives such as a supplemental polymer, colorant, tackifier, processing oil, among others.

Abstract: A reinforcement for an expandable or foaming material is disclosed that comprises a first and a second member each having protuberances that are contacted when the first and second members are joined. The members are joined by bending a hinge that separates the members, or can be joined in multiple units to form a series. The members are maintained in a closed or joined position by at least one latch. Once joined, the first and second members define at least one opening wherein a foaming composition can be injected into the joined members. Alternatively, a preformed expandable material can be placed between the first and second members, or located on selected outer positions, e.g., within an automotive cavity to be sealed.