| 摘要 |
<p>A fire-barrier 4 comprises a composite of three types of fire-retardant materials 5, 6, 7, operable sequentially to combat an increase in temperature, e.g. as occurs on outbreak of a fire, by different methods. A preferred combination of naterials is an outer layer 7 of heat reflective material, an inner layer 5 of thermally intumescent material and an intermediate layer 6 of endothermal material between the inner and outer layers.</p><p>The outer layer 7 preferably comprises a fluid impermeable sleeve of metal or metal alloy which reflects heat and may be of convolute profile to provide a degree of flexibility. The inner layer 5 preferably comprises a carbonific compound to produce a thermally insulating char and one or more of a spumific compound, a blowing agent and a char forming aid. The intermediate layer 6 preferably comprises a material which absorbs heat by a change in state and is conveniently supported on a carrier.</p> |
