Is 800 kg/m3 calcium silicate board strong enough?

Yes. It is one of the strongest grades, carbon-fibre reinforced, with a compressive strength of at least 21 MPa (3045 psi) and flexural strength of at least 7.6 MPa (1102 psi).

Density 800 kg/m³ · High Density · High Strength

Calcium Silicate Board Density 800 kg/m³

Carbon-Fibre Reinforced High-Strength Board for High-Temperature Structural Insulation

The 800 kg/m³ grade is a high-density, carbon-fibre reinforced calcium silicate board built for industrial heat protection where strength matters. It combines high compressive strength and 1100°C (2012°F) service with low thermal conductivity — strong enough for structural back-up, while still insulating.

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≥ 21 MPa / 3045 psi 1100°C / 2012°F 51.2 lb/ft³ Non-Asbestos · A1

Carbon Fibre Calcium Silicate Board 800 kg/m3

Material

What Does 800 kg/m³ Mean?

Density (800 kg/m³) is the board's mass per unit volume. At this density the board is heavier and far stronger than standard insulation grades, while a carbon-fibre reinforcement and low thermal conductivity keep heat loss down — a balance of strength and insulation for demanding positions.

Property	Value (Metric)	Value (US)
Density	800 kg/m³ ±10%	51.2 lb/ft³
Max Service Temp	1100°C	2012°F
Compressive Strength	≥ 21 MPa	≥ 3045 psi
Flexural Strength	≥ 7.6 MPa	≥ 1102 psi
Thermal Cond. @ 800°C	≤ 0.14 W/m·K	≤ 0.97 BTU·in/hr·ft²·°F
Reaction to Fire	A1 non-combustible	Non-asbestos

Carbon-fibre reinforced (N-17). Values indicative, confirmed on request. Density tolerance ±10%.

Advantages

Why 800 kg/m³

💪

High Strength

≥ 21 MPa (3045 psi), carbon-fibre reinforced for structural load.

🔥

High Temperature

Rated to 1100°C (2012°F) peak service.

❄️

Low Thermal Conductivity

≤ 0.14 W/m·K — cuts heat loss and saves energy.

⚙️

Easy Machining

Cut, drilled and CNC-shaped to size.

Density Comparison

800 vs 850 vs 1020 kg/m³

How the high-density grades compare — 800 leads on strength and low conductivity.

800Highest Strength + Low λ

850Structural Balanced

1020Molten Aluminum

Grade	Density	Max Temp	Compressive	Flexural	Thermal @ 800°C
800N-17 Carbon-Fibre	51.2 lb/ft³800 kg/m³	1100°C2012°F	≥ 21 MPa3045 psi	≥ 7.6 MPa1102 psi	≤ 0.14 W/m·K0.97 BTU·in/hr·ft²·°F
850N-14 Structural	53.1 lb/ft³850 kg/m³	1100°C2012°F	≥ 14 MPa2030 psi	≥ 6.1 MPa885 psi	≤ 0.16 W/m·K1.11 BTU·in/hr·ft²·°F
1020Molten Aluminum	63.7 lb/ft³1020 kg/m³	1100°C2012°F	≥ 17 MPa2465 psi	≥ 8.5 MPa1233 psi	≤ 0.23 W/m·K1.59 BTU·in/hr·ft²·°F

FAQ

Frequently Asked Questions

Is 800 kg/m³ calcium silicate board strong enough?

Yes — it is one of the strongest grades, carbon-fibre reinforced, with compressive strength ≥ 21 MPa (3045 psi) and flexural strength ≥ 7.6 MPa (1102 psi).

Does lower density mean better insulation?

For pure insulation with no load, lower-density grades (250–400) are more efficient. The 800 grade is a high-density board chosen for strength and 1100°C service, while still offering low thermal conductivity around 0.14 W/m·K.

Can density 800 be used above 650°C?

Yes. It is rated to 1100°C (2012°F) peak with continuous service around 1000°C (1832°F) — well above 650°C.

Is density 800 suitable for furnace lining?

Yes, as structural back-up insulation behind the refractory lining. It is not a hot-face refractory but provides strength and insulation directly behind it.

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Calcium Silicate Board Density 800 kg/m³

Carbon-Fibre Reinforced High-Strength Board for High-Temperature Structural Insulation

What Does 800 kg/m³ Mean?