| 摘要 |
Water-insensitive insulating structures of expanded perlite bonded by an in situ-produced water-insoluble crystalline reaction product of perlite and sodium or potassium silicate. Structures are obtained by mixing the perlite with an aqueous solution of the silicate to make a damp granular powder, compacting the powder into a coherent article, and curing the article under controlled temperature and humidity conditions so as to maintain a water level in the article of at least about 10 weight percent based on solids for a period of time sufficient to produce the crystalline binder. After curing, the structures are dried, if necessary, to a water content below about 20 percent, based on solids.
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