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Pipe collars contain an intumescent compound which expands on exposure to fire, rapidly exerting pressure upon the pipe or trunking and strangling the cross-section, which has generally softened due to heating. Some pipe collars incorporate a mechanical device that achieves this effect; these types may or may not include an intumescent compound.
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Hilti CFS-C P firestop collar for service penetrations.
Hilti CFS-CC firestop cable collar for cable penetrations.