Non-asbestos calcium silicate · 650 – 1000 °C
Calcium Silicate Refractory Insulation Boards
Supplier and exporter from Rajkot, India. Non-asbestos calcium silicate boards — low-density, low-conductivity back-up insulation for refractory IFB lining systems, pipe and vessel insulation, and structural fire protection.
- Max temp650 – 1000 °C
- Bulk density0.22 – 0.27 g/cm³
- Compressive strength≥ 0.7 MPa
- Conductivity @ 200 °C≈ 0.065 W/m·K
- Standard sizes1000 × 500 × 25/50/75 mm
- AsbestosNil
About this product
What calcium silicate boards are — and where they fit
Calcium silicate insulation boards are pre-formed rigid insulation boards manufactured from a calcium silicate hydrate (CSH) matrix bonded with cellulose-fibre reinforcement. They are non-asbestos, low-density (0.22 – 0.27 g/cm³), exhibit thermal conductivity of about 0.065 W/m·K at 200 °C, and are rated for continuous service from 650 °C (commodity grades) to 1000 °C (premium high-temperature grades). Importantly, this is a board product — not a brick. The page-level adjustments below reflect that: dimensions are board-format, applications are insulation-system rather than hot-face lining, and the spec table is sized for board parameters.
What is calcium silicate board? Calcium silicate board is a structural insulation product used as the back-up layer in refractory lining systems and as the primary insulation in mid-temperature industrial applications. It is rigid (compressive strength ≥ 0.7 MPa), can be field-cut with hand tools, and holds its shape and dimension under typical service. In a refractory lining stack, it is normally located behind the hot-face brick and the IFB layer, immediately adjacent to the steel casing — its job is to reduce the cold-face temperature and the overall heat loss.
The board is also widely used as a stand-alone insulation in petrochemical pipe and vessel insulation, in fire-protection of structural steel beams and columns, and in removable insulation jackets for valves and flanges. Compared to ceramic-fibre blanket, calcium silicate is rigid (does not slump or compress under load) and is non-fibrous (lower handling-time IARC exposure concerns), which is why it is the default back-up choice on most modern lining specifications.
firebrickssource.com supplies calcium silicate boards in standard 1000 × 500 mm format and 25, 50 and 75 mm thicknesses, with custom thicknesses up to 100 mm and pre-cut shapes on request. The product is shipped from Rajkot, Gujarat — Agochar Tech LLP is a refractory bricks manufacturer-cum-merchant exporter from India, and the calcium silicate board supports our refractory lining system specifications. Pair the board with K-23 or K-26 IFB and a high-alumina hot-face for a complete refractory lining design.
Technical specifications
Full property data — calcium silicate board
| Property | Value | Test method |
|---|---|---|
| Composition | Calcium silicate hydrate (CSH), non-asbestos | — |
| Max service temperature | 650 – 1000 °C (grade dependent) | ASTM C411 |
| Bulk density | 0.22 – 0.27 g/cm³ | ASTM C303 |
| Compressive strength (5% deformation) | ≥ 0.7 MPa | ASTM C165 |
| Flexural strength | ≥ 0.5 MPa | ASTM C203 |
| Thermal conductivity at 200 °C | ≈ 0.065 W/m·K | ASTM C177 / C518 |
| Thermal conductivity at 400 °C | ≈ 0.085 W/m·K | ASTM C177 / C518 |
| Linear shrinkage at max temp × 24 h | ≤ 2.0 % | ASTM C356 |
| Asbestos content | Nil (non-asbestos) | Mfg declaration |
| Standard board format | 1000 × 500 mm | — |
| Standard thicknesses | 25 / 50 / 75 mm | — |
| Custom sizes | Pre-cut shapes, thicknesses to 100 mm — on request | — |
*Typical certified values — actual batch values issued on the per-shipment test certificate. Values aligned with IS 1528 / ASTM C-series / EN 993 test methods.
Applications
Where to use calcium silicate boards
- Back-up insulation behind hot-face refractory IFB
- Cold-face layer immediately behind steel casing
- Petrochemical process pipe insulation
- Refinery vessel and reactor insulation
- Power-plant steam line and turbine insulation
- Fire protection of structural steel beams
- Fire-rated door and partition cores
- Removable valve and flange insulation jackets
- Low-temperature furnace lid lining
- Boiler back-up insulation
Datasheet
Download technical datasheet
PDF with all certified properties, dimensional tolerances and applicable ASTM test methods. Use this for tender attachments and procurement files.
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Frequently asked
Calcium silicate — questions buyers ask
What is a calcium silicate insulation board?
Calcium silicate boards are pre-formed insulation boards manufactured from a calcium silicate hydrate matrix bonded with cellulose-fibre reinforcement. They are non-asbestos, low-density (0.22 – 0.27 g/cm³), low-conductivity (~0.065 W/m·K at 200 °C) and rated for service from 650 °C to 1000 °C depending on grade.
What is the difference between a calcium silicate board and an IFB?
Insulating fire bricks (IFB) are shaped refractory bricks for direct hot-face or high-temperature back-up use. Calcium silicate is a pre-formed board for back-up insulation behind a refractory hot-face — it is not a brick and is not used at hot-face temperatures above 1000 °C. The two are usually layered together: dense refractory at the hot-face, IFB next, calcium silicate behind that, then the steel shell.
Is calcium silicate board asbestos-free?
Yes. All boards supplied by firebrickssource.com are non-asbestos, manufactured to international occupational health standards. A non-asbestos declaration is shipped with each consignment for customs and OSHA / EU regulatory compliance.
What are the standard board sizes?
Standard sizes are 1000 × 500 mm in thicknesses of 25, 50 and 75 mm. Other thicknesses (up to 100 mm) and custom-cut shapes can be supplied to drawing. Boards are easily field-cut with a fine-toothed saw.
Where are calcium silicate boards used?
Typical applications include back-up insulation behind hot-face IFB or dense refractory, pipe insulation for petrochemical and power-plant lines, vessel and reactor insulation, fire protection of structural steel, and removable insulation jackets.
What is the typical MOQ and packaging?
Standard MOQ is 1 – 2 MT for stocked thicknesses. Boards are shrink-wrapped in moisture-barrier film, edge-protected, on heat-treated wooden pallets. Container loading is typically 8 – 12 MT per 20-foot container depending on board thickness mix.
Do you provide samples and test certificates?
Yes. Samples can be dispatched on request — normally chargeable plus courier. Every batch is tested for bulk density, compressive strength and thermal conductivity; a test certificate and non-asbestos declaration ship with the consignment.
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Pairs well with these refractory products
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Hot-face IFB — calcium silicate sits behind for the cold-face.
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K-26 Insulating Bricks
Mid-range IFB — pair with CaSi for layered insulation.
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Browse the full K-23 to K-30 insulating refractory range.
ASTM C155 Group 23 – 30