| abstract |
(57) [Summary] [PROBLEMS] A foam of phosphoric acid is essentially a brittle material. The foam is a foam having flexibility and resilience while improving brittleness, and has a constant strength after combustion. Hold. SOLUTION: This is a phosphoric acid foam structure of a phosphoric acid (a) and a foaming agent (b), the brittleness is improved by a cured product of a urethane prepolymer (c) having an NCO group, and boric acid is used. An inorganic-organic composite foam containing (d) and, if necessary, another inorganic filler (e). |