PERLITE
re s e a r ch and practical field experience with perlite con-c r ete have laid a firm base for its acceptance by arc h i - t e c t s, building officials, contra c t o r s, engineers, and oth-er building pro f e s s i o n a l s . Perlite insulating concrete consists of a mixture of ex-panded perlite, Po r tland cement, water and an air en-
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