INSULATION - This property varies with the unit of weight of the concrete which is dependent on the volume of pumice in the mix. The thermal conductivity factor for normal weight concrete (145 p.c.f.) is 12 as compared to 3.5 for concrete with a density of 100 p.c.f. and 1.9 for 60 p.c.f. PERMEABILITY - Despite the porous nature of the aggregate, concrete batched with "AGG-LITE" has absorption characteristics very similar to normal weight concrete. "VAC-LITE" saturated pumice aggregate has nearly 90% external saturation and is used mostly for pumping into place or to eliminate concrete slump variations from batch to job site. AGGREGATE PROPERTIES Sieve analysis (1/2" x No. 4 structural concrete) SIZE % PASSING SPECIFICATION 1/2 100 90-100 3/8 60-70 40-80 No. 4 5-12 0-20 Specific Gravity ............................................................................................ 0.84-0.87 Dry, loose unit weight ..................................................................................25-28 p.c.f. One hour absorption ...............................................................................18-22 percent Vacuum saturation ..................................................................................82-87 percent Chemical Analysis SILICON DIOXIDE (SiO2) 60.30% ALUMINUM OXIDE (Al2O3) 16.26% IRON OXIDE (Fe2O3) 2.80% MAGNESIUM OXIDE (MgO) 5.74% SULPHUR TRIOXIDE (SO3) TRACE LOSS ON IGNITION 4.69% MOISTURE CONTENT 2.15% AVAILABLE ALKALIES 0.96%         California Lightweight Pumice, Inc., San Clemente, CA 92672