Density Guide
How to Choose the Right Density — from 250 to 1200 kg/m³
Calcium silicate board is available across a wide density range, each grade balancing thermal insulation, mechanical strength and temperature resistance differently. This guide compares every grade from 250 to 1200 kg/m³ so you can match the right board to your application.
Compare All Densities →Quick Selector
Reduce heat loss with light, low-conductivity board.
250–650 kg/m³ →High compressive strength and dimensional stability.
800–1200 kg/m³ →Non-combustible passive fire protection solutions.
850–1200 kg/m³ →Non-wetting grade for casting & launder parts.
1020 kg/m³ →CNC-machined discs, rings, tubes & profiles.
800–1200 kg/m³ →Full Comparison
Every grade side by side, with metric and US units. Click a density to open its product page.
| Density | Grade / Use | Max Service Temp | Compressive Strength | Flexural Strength | Thermal Cond. (800°C / 1472°F) |
|---|---|---|---|---|---|
| 25015.6 lb/ft³ | Ultra Insulation | 1050°C1922°F | ≥ 1.0 MPa≥ 145 psi | ≥ 0.55 MPa≥ 80 psi | ≤ 0.165 W/m·K≤ 1.14 BTU·in/hr·ft²·°F |
| 30018.7 lb/ft³ | Industrial Insulation | 1100°C2012°F | ≥ 2.0 MPa≥ 290 psi | ≥ 1.2 MPa≥ 174 psi | ≤ 0.170 W/m·K≤ 1.18 BTU·in/hr·ft²·°F |
| 65040.6 lb/ft³ | General Purpose | 1000°C1832°F | ≥ 5.0 MPa≥ 725 psi | ≥ 3.0 MPa≥ 435 psi | ≤ 0.19 W/m·K≤ 1.32 BTU·in/hr·ft²·°F |
| 80051.2 lb/ft³ | N-17 Carbon Fibre | 1100°C2012°F | ≥ 21 MPa≥ 3045 psi | ≥ 7.6 MPa≥ 1102 psi | ≤ 0.14 W/m·K≤ 0.97 BTU·in/hr·ft²·°F |
| 85053.1 lb/ft³ | N-14 Structural | 1100°C2012°F | ≥ 14 MPa≥ 2030 psi | ≥ 6.1 MPa≥ 885 psi | ≤ 0.16 W/m·K≤ 1.11 BTU·in/hr·ft²·°F |
| 98061.2 lb/ft³ | Thermal Shock | 1100°C2012°F | ≥ 15 MPa≥ 2175 psi | ≥ 7.0 MPa≥ 1015 psi | ≤ 0.22 W/m·K≤ 1.53 BTU·in/hr·ft²·°F |
| 102063.7 lb/ft³ | Molten Aluminum | 1100°C2012°F | ≥ 17 MPa≥ 2465 psi | ≥ 8.5 MPa≥ 1233 psi | ≤ 0.23 W/m·K≤ 1.59 BTU·in/hr·ft²·°F |
| 120074.9 lb/ft³ | High Strength | 1100°C2012°F | ≥ 23 MPa≥ 3335 psi | ≥ 15 MPa≥ 2175 psi | On request |
All grades are non-asbestos and A1 non-combustible. Density tolerance ±10%. Continuous service temperature for the 800–1020 kg/m³ grades is 1000°C (1832°F); 1100°C (2012°F) is the maximum / peak service temperature. The 650 kg/m³ grade is made-to-order; values are indicative and confirmed on request.
Selection
Up to 1000°C → 650
Up to 1050°C → 250
Up to 1100°C → 300 · 800 · 850 · 980 · 1020 · 1200
Light insulation → 250 · 300
General purpose → 650 · 800
High strength & load → 850 · 980 · 1020 · 1200
Insulation → 250–650
Fire protection → 850 · 980 · 1200
Molten aluminum → 1020
Custom shapes → 800–1200
Two Families
Light weight and low thermal conductivity for heat-loss reduction. Best for furnace, boiler, kiln and pipe insulation where insulation performance matters more than load. Lower compressive strength.
View Insulation Series →High compressive strength, dimensional stability and machinability. Best for structural support, fire protection, molten-aluminum contact and CNC-machined shaped parts. Higher strength, still strong insulation.
View High Density Series →Reference Data
| Component | Low Density | High Density |
|---|---|---|
| SiO₂ | 52 Min | 50 Min |
| CaO | 40 Min | 35 Min |
| Al₂O₃ | 0.3 Max | 1 Max |
| Fe₂O₃ | 1.0 Max | 0.5 Max |
| Loss on Ignition | 7 Max | 7 Max |
Values in %. Low density = 250–650 kg/m³; high density = 800–1200 kg/m³.
| Family | Length × Width | Thickness |
|---|---|---|
| Low Density | 1210×1210 · 1220×1220 · 1230×1000 · 1230×500 · 1260×600 · 1080×950 · 1000×500 | 10–100 |
| High Density | 1230×1230 · 1250×2500 · 1200×600 | 6–160 |
Customized sizes and shaped products available upon request.
Tell us your temperature, load, dimensions and application — our engineers will recommend the right grade.
Request Technical Support →FAQ