Super Firetemp® Calcium Silicate Insulation Board
— Grades,Specs, and Availability

Super Firetemp is a non-asbestos, non combustible structural calcium silicate insulation board manufactured by Johns Manville. It is a Type II calcium silicate product per ASTM C656 — the standard specification for calcium silicate thermal insulation used in industrial, commercial, and fire protection applications. Super Firetemp is machinable: it can be cut, drilled, and fabricated with standard woodworking tools. All grades are non asbestos, contain no mercury or lead, and produce a clean, non-contaminating surface.

Super Firetemp is a calcium silicate board — a composite of calcium, silica, and reinforcing fibers, formed under heat and pressure into rigid, dimensionally stable boards. It contains no asbestos and no gypsum. The result is a board that maintains structural integrity and insulating performance at elevated temperatures, with consistent density and thermal properties across grades.

ASTM C656 is the standard specification for calcium silicate thermal insulation. Super Firetemp meets ASTM C656 Type II — the designation for higher-density calcium silicate boards used in structural and industrial applications. Engineers who specify calcium silicate insulation by ASTM standard can use Super Firetemp to meet Type II requirements. This is a key differentiator: Marinite referenced ASTM C177 (a thermal conductivity test method), while Super Firetemp carries full ASTM C656 Type II product compliance.

AWMCO stocks five Super Firetemp grades plus Super Caltemp Gold, covering the full density and temperature range of calcium silicate applications. All grades are Type II calcium silicate per ASTM C656

BNZ Materials, the sole manufacturer of Marinite, has permanently closed its Marinite production facility. Marinite production has ended and will not resume. AWMCO holds some of the last remaining Marinite inventory — but when that stock is gone, Super Firetemp is the primary in-stock ongoing replacement for most Marinite grades.

Super Firetemp covers the same product category: non-asbestos, non-combustible, structural calcium silicate board for high-temperature industrial and fire protection applications. It is available with monthly restocking, making it a reliable long-term supply solution for buyers who previously depended on Marinite.

For detailed specification comparisons, side-by-side data tables, and application guidance for each Marinite grade, see the full Marinite replacement guide:

Super Firetemp is used across industrial, commercial, and fire protection applications wherever non-combustible structural insulation is required at elevated temperatures. Common applications include:

•      Industrial furnace wall panels and backup insulation

•      Fire door cores and assemblies

•      Kiln furniture and sidewall lining

•      Oven housings and heat processing equipment

•      Welding and torch protection panels

•      Marine and shipboard fire insulation

•      Aerospace ground support heat shields

•      Petrochemical and refinery insulation panels

•      Structural thermal separation components

•      Electrical enclosures in high-temperature environments

AWMCO stocks adhesives and coatings designed for use with Super Firetemp and other calcium silicate boards. These products extend the value of a Super Firetemp order and are required for many installation specifications.

AWMCO is an authorized distributor for Johns Manville Super Firetemp — stocking one of the largest selections of Super Firetemp grades in the US. That authorization matters: it means direct manufacturer pricing, verified product traceability, and access to documentation that general industrial marketplaces cannot reliably provide.

Have questions? Email customerservice@awmcousa.com or call (708) 478-6032.