Calcium Silicate Block & Pipe Section

Calcium silicate is a rigid, high-strength insulation supplied as blocks and pipe sections for boilers, high-temperature process piping and refractory backup up to 1000°C. Its compressive strength above 0.5 MPa makes it a load-bearing insulation, used where the insulation must carry weight or resist mechanical damage.

Calcium silicate block and pipe section is rated up to 1000°C. That is well above rock wool products, which are rated up to 650°C in this catalogue, so calcium silicate is chosen for hotter pipes and equipment or as the inner layer against the hot face.

Yes, calcium silicate has a chloride content below 10 ppm, so it is considered safe for stainless steel. Keeping the insulation dry under sound weatherproof cladding still matters, because moisture can carry chlorides from the environment onto hot stainless surfaces.

Calcium silicate blocks are 900 or 1000 mm long and 150, 300 or 610 mm wide, and pipe sections cover NB sizes from 15 mm to 600 mm and above. Thicknesses are 25, 40, 50, 65, 75 and 100 mm, with density of 220 to 280 kg/m³.

Use Calcium Silicate Block & Pipe Section above 650°C, at pipe supports, or where insulation must withstand load and impact. Rockwool Pipe Section is lighter and has lower conductivity, 0.033 to 0.040 W/mK versus 0.055 to 0.075 W/mK, so it is often the more economical choice for general piping up to 650°C.

Calcium silicate has a thermal conductivity of 0.055 to 0.075 W/mK. It is non-combustible, Class A1, has low water absorption, and hydrophobic grades are available. Because conductivity is higher than mineral wool, thickness should be checked with the heat-loss calculator on this site.

Calcium silicate blocks and pipe sections are fitted with tight joints, staggered in multi-layer work, and secured with Insulation Band & Buckles or wire. Being rigid, blocks are cut to shape with a saw. The system is finished with Aluminum Cladding Sheet & Coil and Self-Tapping Screw fixings, sealed against weather outdoors.

Calcium silicate block and pipe section is supplied to ASTM C533 and IS 8154, the standards for calcium silicate thermal insulation. If you need test certificates or inspection against these, include that in your enquiry and we will confirm what is available for your order.

Calcium silicate is packed in wooden crates or palletized cartons to protect its rigid edges during sea freight, and it is declared under HS code 6806 20 00 for heat-insulating mineral material blocks and pipe sections. Crates can share a container with rock wool, cladding and refractory products.