| 摘要 |
PROBLEM TO BE SOLVED: To provide a roof material making a board of a thermoplastic resin conformed to technical standard determined in a building standard law by improving flame retardancy. SOLUTION: Glass fabrics having 15 strings/25 mm or more in fiber density concerning both vertical and horizontal strings are laminated on at least one side of the board comprising the thermoplastic resin whose oxygen index (JIS K7201) is 21 or more. COPYRIGHT: (C)2004,JPO
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