A fire stopping device includes a containment shell with a heat rupturable element and an intumescent filler material arranged in the containment shell. The containment shell is formed of a fire resistant material capable of containing the intumescent material after the rupturable element fails. In addition, the heat rupturable element is designed to fail at a force which is lower than the intumescent filler material expansion force. In this manner, when the intumescent filler material reaches its activation temperature, it expands with a force greater than the strength of the rupture element, thereby causing the rupture element to fail. Thus, expansion of the intumescent filler material takes place in a controlled manner via the rupture element.

One embodiment of an intumescent composition comprises a halogenated polymer, antimony oxide, and intercalated graphite, while one embodiment of an intumescent additive mixture comprises antimony oxide and intercalated graphite. One embodiment of the method of making an intumescent composition comprises melt blending a halogenated polymer with antimony oxide, and intercalated graphite.

Self-extinguishing cable, in particular an electrical cable for low-voltage or medium-voltage power transmission or distribution of data transmission, having at least one conductor and at least one flame-retardant coating positioned externally to the conductor. The flame-retardant coating is produced from an expanded polymeric material which incorporates at least one intumescent agent.

A moldable elastomeric intumescent material comprises chlorinated polyethylene, plasticizers, phosphate based foaming agents, char forming materials, antioxidants, intumescent materials, flame retardant materials, and graphite and/or expandable graphite. A curing agent, and optionally a co-curing agent or an accelerator, may further be incorporated into the material to improve the rigidity of the material when it is exposed to fire. The composition also possesses enhanced intumescence and flame retardancy properties by the addition of graphite, and preferably expandable graphite, to the composition.

An intumescent firestopping apparatus used in poke-through applications for selectively sealing an opening through a construction barrier such as a wall, floor or ceiling having cables or other penetrating members extending therethrough. The apparatus effectively seals this barrier responsive to a fire to prevent unwanted transmission of fire through conventional construction barrier areas. The apparatus includes a sleeve with two intumescent pads positioned therein. At least one of the pads has an arcuate curved central section to be biased against the other intumescent pad to define therebetween a confinement area for holding of cables centrally located therein in a dynamically adjustable sealing throat defined therebetween. These pads can be variously mounted with respect to the adjacent wall structures and one or both of the pads can be arched toward the other pad to facilitate defining of the dynamic throat for receiving cables extending therethrough.