To solve the problems, e.g., that the conventional glass has been produced by melting a solid and glass production from an aqueous solution has not been achieved, further, the fact that water glass is foamed by being heated has been known but a method for forming a foamed body stable in water has not been shown, and further, the feed of an easily recyclable foamed material has not been achieved.

A silicate and a borate can be easily mixed in an aqueous solution, and when being heated, the mixture is foamed, so as to give a foamed body. By controlling the heating temperature at this time, the foamed body of borosilicate glass having high resistance to heat and shock can be obtained. Since its composition is same as that of glass, recycling as glass is possible, and a material usable in a wide range for heat insulation, sound insulation, vessels or the like can be provided. Further, metal oxide can be easily added to the aqueous solution of a silicate and a borate, and, in the foamed body thereby, as a ceramic foamed body, the reinforcement of heat resisting effect can be attained.

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