| abstract |
The invention is directed to a thermally expandable composition comprising at least one solid rubber R, at least on tackifying resin TR, at least one blowing agent BA, a vulcanization system VS, and 0.5 – 30 wt.-% of fibrous magnesium oxysulphate or carbon fibers or a mixture thereof. The invention is also directed to a shaped article comprising a substrate layer composed of the thermally expandable composition, to a method for providing sealing, structural adhesion, baffling, or combination thereof to a structure of a manufactured article, and to use of fibrous magnesium oxysulphate or carbon fibers or a mixture thereof in a thermally expandable composition to improve sag resistance and/or flame resistance properties of said composition. |