| 摘要 |
A fire barrier comprising an intumescent composition packed into the space between a thermoplastic pipe and an access hole or duct in a wall or floor through which the thermoplastic pipe is laid, said intumescent composition being characterized in that it will expand on heating to temperatures at which the thermoplastic pipe melts or burns, to form a fire resistant mass, said intumescent compound being present in sufficient amounts to completely fill the access hole or duct in its expanded state.
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