Calcium Silicate thermal insulation is defined by ASTM as insulation composed principally of hydrous calcium silicate, and which usually contains reinforcing fibers. Normally calcium silicate pipe segments and flat boards are used for industrial equipment insulation.

Calcium Silicate Pipe Segments and Block Insulation are covered in ASTM C 533. The standard contains three types classified primarily by maximum use temperature and density.

Calcium Silicate Pipe Segments and Block Insulation

Calcium Silicate Pipe

Calcium Silicate thermal insulation

TypeMaximum Use Temp (°F) and Density
IMax Temp 1200°F, Max Density 15 pcf
IAMax Temp 1200°F, Max Density 22 pcf
IIMax Use Temp 1700°F

The standard limits the operating temperature between 80°F to 1700°F.

Calcium Silicate pipe insulation is supplied as hollow cylinder shapes split in half lengthwise or as curved segments. Pipe insulation sections are typically supplied in lengths of 36 inch, and are available in sizes to fit most standard pipe sizes. Available thicknesses range from 1″ to 3″ in one layer. Thicker insulation is supplied as nested sections.

Calcium Silicate block insulation is supplied as flat sections in lengths of 36″, widths of 6″, 12″, and 18″ and thickness from 1″ to 4″. Grooved block is available for fitting block to large diameter curved surfaces.

Special shapes such as valve or fitting insulation can be fabricated from standard sections.

Calcium Silicate is normally finished with a metal or fabric jacket for appearance and weather protection.

The specified maximum thermal conductivity for Type 1 is 0.41 Btu-in/(h ft2 °F) at a mean temperature of 100°F. The specified maximum thermal conductivity for Types 1A and Type 2 is 0.50 Btu-in/(h ft2 °F) at a mean temperature of 100°F.

The standard also contains requirements for flexural (bending) strength, compressive strength, linear shrinkage, surface-burning characteristics, and maximum moisture content as shipped.

Typical applications include piping and equipment operating at temperatures above 250°F, tanks, vessels, heat exchangers, steam piping, valve and fitting insulation, boilers, vents and exhaust ducts.


Find more calcium silicate products here below :

Calcium Silicate Insulation

Fire Rated Calcium Silicate for Ceiling or Wall

High Density Non-wetting Calcium Silicate N17 boards