Typical Properties of Perlite/Sodium Silicate Composites

Perlite/Silicate Composites for High Temperature Insulation and Formed Shapes
Prepared by: The Perlite Institute

TYPICAL PROPERTIES OF PERLITE/SODIUM SILICATE COMPOSITES
Thermal Conductivity (ASTM C-177, C-325) at a mean temp. 250 F (120 C)	0.40 BTU.in/h.ft2.F0 (0.058 W/m.K)
Thermal Conductivity (ASTM C-177, C-325) at mean temp. 450 F (230 C)	0.56 BTU.in/h.ft2.F0 (0.081 W/m.K)
Thermal Conductivity (ASTM C-177, C-325) at mean temp. 6600F (3500C)	0.65 BTU.in/h.ft2.F0 (0.094 W/m.K)
Thermal Limit (ASTM C-447)	12000F (6500C)
Density(ASTM C-447)	11-16 lb/ft3 (180-260 kg/m3)
Modulus of Rupture (ASTM C-203,C-446) minimum	50-60 lbs/in2 (0.34-0.41 N/mm2
Compressive Strength(ASTM C-165) minimum	75-88 lbs/in2 (0.52-0.61 N/mm2
Linear Shrinkage (ASTM C-356)	less than 2% at 1200 0
Water Absorption	under 10% by volume after 24 hours