Gas filtering device for an air bag gas generator

摘要

The present specification describes a filtering device for removing particulate matter from an exhaust stream of a pyrotechnic gas generator (10) for the inflation of an air bag. The device comprises a filter body (50) which has a gasket arrangement in its end faces (59,72) for sealing the filter body (50) in position, the gasket arrangement including a compressed sheet (100,102) formed of a combination of intercalated graphite particles and exfoliated flexible graphite particles. In use the said sheet expands to improve the seal, the expansion being due to the heat applied by the exhaust stream.