High Density Calcium Silicate Board

Ultra-high density calcium silicate board (>500kg/m³) for applications requiring maximum mechanical strength.

Density: >500 kg/m³
Raw Material: Quartz sand
Thickness: 25-100mm (10mm for high density)
Asbestos: 100% Non-Asbestos

Overview

✦ Ultra-high density
✦ Maximum mechanical strength
✦ Excellent load bearing
✦ Thermal insulation

High density calcium silicate board with density exceeding 500 kg/m³ custom manufactured for applications where maximum mechanical strength and load-bearing capacity are required alongside thermal insulation performance.

What Is High-Density Calcium Silicate Board?

High-density calcium silicate board pairs the low conductivity and A1 fire rating of calcium silicate with greater mechanical strength, suited to load-bearing or abuse-exposed insulation where standard board would deform.

Key Technical Specifications

Property	Value
Maximum service temperature	up to 1000°C
Density	250–500 kg/m³
Thermal conductivity	≤0.065 W/(m·K) at 100°C; ≤0.10 W/(m·K) at 400°C
Standard thickness	25–100 mm
Standard dimensions	600×900 mm, 1000×1200 mm and custom
Fire classification	A1 (non-combustible, EN 13501-1)
Composition	xonotlite calcium silicate hydrate reinforced with inorganic fibre; 100% asbestos-free
Standards	ASTM C533, EN 14306

Properties & Advantages

Higher compressive and flexural strength than standard grade
A1 non-combustible, low chloride
Dimensional stability at temperature
Machinable and screw/bolt friendly
Asbestos-free, long service life

Typical Applications

Structural and equipment insulation
Kiln-car tops and furnace liners
Load-bearing or walk-on insulation
Pipe supports and abuse-exposed panels

Installation & Handling

Cut with a carbide blade or saw, fix with studs, screws or refractory adhesive and support any overhang. Joint and jacket outdoor sections as for standard calcium silicate.

Standards & Compliance

Manufactured to ASTM C533, EN 14306 and controlled under a documented quality system. Supplied by a manufacturer holding ISO 9001, CE and SGS certifications, exporting high-temperature insulation to 60+ countries since 1982.

Why Specify This Product

Combines stable high-temperature performance with straightforward on-site fabrication. The material is asbestos-free, chemically stable in neutral and oxidising atmospheres, and supplied with full technical data sheets to support specification and inspection. Supplied by a manufacturer holding ISO 9001, CE and SGS certifications, exporting high-temperature insulation to 60+ countries since 1982.

Manufacturer & Supplier

Rosetexwool is a high-density calcium silicate board manufacturer and supplier serving more than 60 countries since 1982. Every high-density calcium silicate board is produced under a documented quality system certified to ISO 9001, CE and SGS, with batch-level traceability from raw material to finished product.

What our manufacturing capability covers:

In-house melting, fibre-forming and finishing lines for consistent grade and density
Dimensional, density and thermal checks against ASTM C533, EN 14306
Asbestos-free, low-impurity formulations verified by incoming and outgoing inspection
Standard and custom sizes, OEM/ODM grades, and cut-to-size supply for project quantities

For quotations, lead times or technical data sheets, contact our team with your specification and target service temperature. Explore the calcium silicate insulation hub for the full range, or read the calcium silicate insulation buying guide for selection support.

Related Calcium Silicate Products & Alternatives

composite silicate insulation board — The economical answer for medium-temperature kilns, ducts and curved equipment where the surface geometry rules out flat board.

calcium silicate insulation board — Rigid calsil board carrying the highest compressive strength of any hard insulation block, holding its shape without deformation at working temperature while staying fully asbestos-free.

nano aerogel blanket — Reaches the thermal performance of far thicker conventional insulation in a fraction of the thickness, which is why it is used subsea and offshore.

For the full calcium silicate range, temperature limits and strength data, see our calcium silicate insulation guide.

For adjacent material options across temperature and application ranges, explore our rock wool insulation hub.

Explore flexible aerogel and microporous insulation options in our aerogel insulation guide.

Part of the Calcium Silicate product family.

Key features

✓ Ultra-high density
✓ Maximum mechanical strength
✓ Excellent load bearing
✓ Thermal insulation
✓ Asbestos-free
✓ Customizable

Typical applications

Load-bearing insulation applications
Heavy industrial equipment
High-pressure environments
Structural insulation

Technical specs

Density: >500 kg/m³
Raw Material: Quartz sand
Thickness: 25-100mm (10mm for high density)
Asbestos: 100% Non-Asbestos

Last updated: September 30, 2026

Frequently asked

What is the maximum temperature for calcium silicate insulation? +

Calcium silicate insulation boards can withstand continuous temperatures up to 1100°C. They offer high compressive strength and excellent dimensional stability, making them ideal for high-temperature pipe supports, furnace backup insulation, and aluminium smelter applications.

How does calcium silicate compare to ceramic fiber? +

Calcium silicate offers significantly higher compressive strength (up to 6 MPa) than ceramic fiber blankets, making it the preferred choice for load-bearing insulation. It is supplied in rigid board form, easy to cut and machine. Ceramic fiber, however, offers higher temperature limits (up to 1430°C) and lower thermal conductivity in blanket form.

Is calcium silicate asbestos-free? +

Absolutely. All our calcium silicate products are manufactured using an asbestos-free formula. They meet international health and safety standards including ASTM C533 and EN 14306, and are certified as non-hazardous material for transport and handling.

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