Calcium Silicate insulation is a molded mixture of lime, silica and reinforcing fibers. This material is a high temperature, abuse-resistant board insulation with exceptional structural strength and is ideal as backup insulation to add strength. These types of boards are composed of monolithic fiber reinforced chemicals.

Calcium silicate insulation can be machined with great detail and to within tight tolerances. It can also be cemented to create non-flat configurations.