W-CSP 900 Calcium Silicate Insulation Paste — High Temperature Insulation Paste up to 900°C
Overview
W-CSP 900 is a ready-mix calcium silicate insulation powder designed for on-site preparation of high-temperature insulation paste. When blended with water and sodium silicate binder, it creates a trowelable paste that — after curing — delivers thermal and mechanical properties equivalent to Wedge W-LD 900 and HD850 factory-pressed calcium silicate boards. This grade bridges the gap between medium-temperature applications and the demanding environments found in steel plants, power stations, and petrochemical facilities where temperatures reach 900°C.
Key Features & Benefits
- Thermal conductivity 0.062 W/mK at 100°C, rising to only 0.152 W/mK at 600°C — maintains effective insulation performance across a wide operating range
- Continuous service up to 900°C — suitable for furnace casings, boiler shells, heat treatment equipment, and exhaust ducting
- Cured density 245–280 kg/m³ — lightweight yet achieves ≥1.3 MPa compressive strength, strong enough to support cladding and jacketing
- Chemical resistance — inert to CO, H₂, CH₄, NH₃, N₂ atmospheres; non-reactive with carbon steel, stainless steel, and aluminium
- Trowelable consistency — apply in 10–25 mm layers with standard plastering tools; no cutting, no waste, no special equipment
- 100% asbestos-free, no RCF/AES ceramic fibres — REACH compliant, OSHA compliant, EN 13501-1 Class A1 non-combustible
- Thermal shock resistant — withstands rapid temperature cycling without cracking or delamination
- 12-month shelf life — stable in original sealed packaging under dry storage conditions
Applications
- Steel & Metals: Ladle backup insulation, tundish insulation, induction furnace casings, continuous casting equipment
- Power Generation: Boiler casings, turbine insulation, exhaust ducting, flue gas desulphurisation equipment
- Petrochemical & Refining: Irregular pipe junctions, column and vessel insulation, heat exchanger shells
- Cement & Glass: Kiln shell insulation, preheater cyclone linings, melting furnace backup
- General Industrial: On-site repair of damaged board insulation, gap filling, insulation of non-standard geometries
Available Specifications
| Property | Value |
|---|---|
| Max. Service Temperature | 900°C |
| Thermal Conductivity @ 100°C | 0.062 W/mK |
| Thermal Conductivity @ 200°C | 0.078 W/mK |
| Thermal Conductivity @ 300°C | 0.094 W/mK |
| Thermal Conductivity @ 400°C | 0.110 W/mK |
| Thermal Conductivity @ 500°C | 0.130 W/mK |
| Thermal Conductivity @ 600°C | 0.152 W/mK |
| Cured Dry Density | 245–280 kg/m³ |
| Cold Compressive Strength | ≥1.3 MPa |
| Flexural Strength | ≥0.45 MPa |
| Linear Shrinkage | ≤1.0% |
| Particle Size | 10–250 µm |
| Packaging | 25 kg bags |
| Mixing Ratio (Powder : Sodium Silicate : Water) | 100 : 18–22 : 30–40 (by weight) |
| Pot Life | 45–60 minutes @ 25°C |
Why Choose Wedge Insulation?
Wedge Industries Limited manufactures and exports insulation materials to 45+ countries. Every W-CSP grade is backed by full technical datasheets, application engineering support, and competitive volume pricing. We supply directly from our manufacturing base in India with fast dispatch to domestic and international projects.
Frequently Asked Questions
How does W-CSP 900 compare to W-LD 900 calcium silicate boards?
After full curing, W-CSP 900 paste achieves the same thermal conductivity profile (0.062 W/mK at 100°C to 0.152 W/mK at 600°C), similar density (245–280 kg/m³), and ≥1.3 MPa compressive strength — matching W-LD 900 board performance. The paste is preferred for irregular surfaces, repairs, and complex geometries.
Can W-CSP 900 be used in reducing gas atmospheres?
Yes. The cured paste is chemically resistant to CO, H₂, CH₄, NH₃, and N₂ atmospheres. It is non-reactive with carbon steel, stainless steel, and aluminium at operating temperatures up to 900°C.
What is the minimum order quantity for W-CSP 900?
Standard MOQ is 1 pallet (1000 kg / 40 bags). Smaller trial quantities of 100–200 kg are available for testing and qualification. Contact us for project-specific requirements.
How long does the paste take to fully cure?
Air-dry 24–48 hours at ambient temperature, then heat up at ≤50°C/hour to service temperature. Full mechanical strength is achieved after the first thermal cycle to operating temperature.
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