| 摘要 |
A heat-resistant phenolic resin foam containing a hydrate of an inorganic compound which generates a water vapor at a temperature below the decomposition temperature of the phenolic resin foam, wherein (a) the hydrate of the inorganic compound has a pH of not more than 8 as its saturated aqueous solution, and (b) the hydrate of the inorganic compound is contained in an amount of 2 to 30% by weight in the phenolic resin foam.
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