| 摘要 |
PROBLEM TO BE SOLVED: To obtain a ring-form joint material to be used at the joint of refractory two-layer pipes, good in attaching operability and durability and excellent in flexibility and fireproofness. SOLUTION: The joint material is obtained by incorporating a base rubber comprising a vulcanizable rubber with each specific amount of a thermally expandable graphite, aluminum phosphite, an inorganic filler, a vulcanizing agent and vulcanization promoter followed by vulcanization treatment. Thus, this joint material is such as to use a flexible fireproof rubber having flame retardancy, thermally expandable on fire breakout and giving residues after burned with sufficient shape retainability. COPYRIGHT: (C)2007,JPO&INPIT
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