| 摘要 |
Fire screening glazing panels comprise at least one layer 2, 6 of intumescent material such as hydrated sodium silicate sandwiched between flat vitreous sheets 1, 3, 7. To promote fire resistance in a simple and economical way, at least one (and preferably only one) vitreous sheet 1 has a thickness of 6 mm or more, preferably from 7 to 10 mm. The or each other vitreous sheet 3, 7 has a preferred thickness range of 2.5 to 4 mm. The thicker sheet 1 is best located in the interior of a panel with three or more vitreous sheets and it or any other vitreous sheet may be made of boro-silicate or other low expansion or high softening point vitreous material. |
