| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet for an incombustible duct for which the approval of a base material test can be obtained by containing a metallic hydroxide in a fire resistant fiber sheet. SOLUTION: This sheet is formed of a fire resistant fiber sheet and a metallic thin film. Then, spanless nonwoven fabric of fire resistant fiber which uses acrylic fiber as a precursor and has two denier and a prescribed length, is dipped in an aqueous solution of a aluminium hydroxide. Next, after the aluminium hydroxide is stuck by a prescribed % (owf), laminate work is performed on aluminium foil of prescribedμm by a polyamide hot melt adhesive. Then, calking work is performed by an aluminium plate having a prescribed thickness, and a duct is made. Therefore, an incombustible duct for which the approval of a base material test of JIS A-1321 can be obtained, can be obtained.
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