Refractory Sheet Type RSLE-57 is a low thermal expansion, high strength, silica composite product designed for use as a structural insulator in high thermal shock prone induction hot presses. The product is a combination of amorphous silica reinforcing material and a silica ceramic matrix. It exhibits useful properties to temperatures of 2102¯F (1150¯C). The material is 99.7% SiO2 and is 100% inorganic. Bulk density is 2.1 g/cc (90 pcf) with a thermal expansion coefficient (RT to 800¯C) of 0.3 x 10-6. Compressive strength is 48 Mpa (7000 psi) with a modulus of rupture of 30 Mpa (4300 psi).