Density 400 kg/m³ · High Strength Grade

Calcium Silicate Board Density 400 kg/m³

High-Strength General-Purpose Board for Heavy-Duty Industrial Insulation

The high-strength grade between standard 300 and structural 650 — more load capacity than standard board, lighter than the structural grade, with a strong strength-to-weight ratio for general heavy-duty insulation.

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High Strength Strong Strength-to-Weight Versatile Heavy-Duty Non-Asbestos · A1

High strength 400 kg/m3 calcium silicate board

400 high strength calcium silicate board structure

Why 400 kg/m³

Why Choose 400 kg/m³ Calcium Silicate Board

More Strength Than Standard Grades

Higher compressive strength than the 250 and 300 boards for areas that see more mechanical load and handling.

Lighter Than Structural 650

A better strength-to-weight ratio where the full structural 650 grade would be more than the job needs.

Versatile Heavy-Duty Insulation

The general-purpose high-strength choice for furnace linings, heat treatment, heavy equipment and load areas.

Technical Data

400 kg/m³ Specifications

Property	Value (Metric)	Value (US)
Density	400 kg/m³ ±10%	25.0 lb/ft³
Max Service Temperature	1000°C	1832°F
Compressive Strength	≥ 3.0 MPa	≥ 435 psi
Flexural Strength	≥ 1.8 MPa	≥ 261 psi
Thermal Conductivity @ 800°C	≤ 0.18 W/m·K	≤ 1.25 BTU·in/hr·ft²·°F
Reaction to Fire	A1 non-combustible	Non-asbestos

Made-to-order high-strength grade; values are indicative and confirmed on request. Density tolerance ±10%. Non-asbestos, A1 non-combustible.

Chemical Composition

Component	Unit	Value
SiO₂	%	52 Min
CaO	%	40 Min
Al₂O₃	%	0.3 Max
Fe₂O₃	%	1.0 Max
Loss on Ignition	%	7 Max

Dimensions (mm, ±2mm)

Length × Width	Thickness
1220×1220 · 1210×1210	20–100
1230×1000 · 1260×600	20–100
1000×500 · custom	to order

Custom sizes and thicker sections available to order.

Installation

How to Install

Measure & Cut

Survey the surface and cut boards to size with a saw or CNC.

Anchor

Fix with mechanical anchors or high-temperature adhesive.

Joint

Stagger and seal joints to prevent heat paths.

Cover

Apply the outer casing or finish layer.

FAQ

Frequently Asked Questions

What is 400 kg/m³ calcium silicate board?

The high-strength grade: denser and stronger than the standard 300 board but lighter than the structural 650 board, giving a strong strength-to-weight ratio for heavy-duty general industrial insulation.

What is the difference between 300 and 400?

The 400 grade has higher compressive strength and durability than the 300 standard grade, for areas with more mechanical load; 300 is lighter and lower cost for general furnace insulation.

What is the difference between 400 and 650?

650 is the maximum structural grade with the highest load-bearing capacity; 400 is lighter with a better strength-to-weight ratio for general heavy-duty use where 650 would be more than needed.

Can 400 board support load?

Yes. With higher compressive strength than the standard grades it suits moderate mechanical and structural loads; share your load case for confirmation.

How is it installed?

Cut to size and fix with mechanical anchors or high-temperature adhesive; stagger and seal joints, then apply the cover layer.

What is the working temperature?

Service temperature is up to 1000°C (1832°F).

What thicknesses are available?

Standard thickness is 20–100 mm, with custom thickness and sizes available to order.

What export packaging do you provide?

Boards are film-wrapped, edge-protected and palletized or crated for safe international shipping.

Calcium Silicate Board Density 400 kg/m³

High-Strength General-Purpose Board for Heavy-Duty Industrial Insulation