How to Mix Perlite and Cement
Perlite concrete mixed at a ratio of 1 part cement to 6 parts perlite has an insulation value, or "k" value, of and a compressive strength of 125 to 200 pounds per square inch. At a ratio of 1 part cement to 4 parts perlite, you achieve a "k" value of and compressive strength of 350 to 500 pounds per inch.