W-CSP 650 Calcium Silicate Insulation Powder — On-Site Insulation Paste for Temperatures up to 650°C
Overview
W-CSP 650 is a ready-mix calcium silicate insulation powder engineered for on-site preparation of trowel-grade insulation paste. Simply mix with water and sodium silicate binder, apply to any surface with standard plastering tools, and after curing the paste develops thermo-mechanical properties equivalent to Wedge W-LD 650 factory-pressed calcium silicate boards. Ideal for applications where rigid boards cannot be cut to fit — complex pipe geometries, valve bodies, irregular equipment surfaces, and repair/patching of existing insulation.
Key Features & Benefits
- Thermal conductivity 0.055 W/mK at 100°C — delivers effective insulation performance equivalent to factory-pressed calcium silicate boards at a fraction of the installation time
- Continuous service up to 650°C — suitable for medium-temperature industrial equipment, HVAC ducting, and process piping
- Cured density 220–260 kg/m³ — lightweight self-supporting insulation layer with ≥0.65 MPa compressive strength after drying
- Trowelable paste consistency — apply in 10–25 mm layers by trowel, spatula, or plastering tools; no cutting, no waste
- Excellent adhesion — bonds directly to carbon steel, stainless steel, aluminium, masonry, and existing insulation surfaces
- 100% asbestos-free, no ceramic fibres (RCF/AES) — safe for workers, REACH compliant, EN 13501-1 Class A1 non-combustible
- 12-month shelf life — store in original sealed bags in dry conditions
- 40–60% faster installation — eliminates measuring, cutting, and fitting of rigid boards on complex geometries
Applications
- HVAC & Building Services: Duct insulation, air handling unit casings, boiler room pipe junctions
- Petrochemical: Valve insulation, pipe branch connections, heat exchanger shell patching
- Food & Pharmaceutical: Process equipment insulation where hygiene-grade surfaces are maintained
- General Industrial: Repair and patching of damaged calcium silicate board insulation, gap filling between pre-formed sections, insulation of non-standard geometries
Available Specifications
| Property | Value |
|---|---|
| Max. Service Temperature | 650°C |
| Thermal Conductivity @ 100°C | 0.055 W/mK |
| Thermal Conductivity @ 200°C | 0.066 W/mK |
| Thermal Conductivity @ 300°C | 0.082 W/mK |
| Thermal Conductivity @ 400°C | 0.100 W/mK |
| Cured Dry Density | 220–260 kg/m³ |
| Cold Compressive Strength | ≥0.65 MPa |
| Flexural Strength | ≥0.30 MPa |
| Linear Shrinkage | ≤2.0% |
| Particle Size | 10–250 µm |
| Packaging | 25 kg bags |
| Mixing Ratio (Powder : Sodium Silicate : Water) | 100 : 15–20 : 35–45 (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 do I mix W-CSP 650 powder into insulation paste?
Mix 100 parts W-CSP 650 powder with 15–20 parts sodium silicate solution and 35–45 parts clean water using a low-speed paddle mixer (300–500 RPM) for 5–10 minutes until a lump-free, trowelable paste forms. Pot life is 45–60 minutes at 25°C.
What temperature can W-CSP 650 insulation paste withstand?
W-CSP 650 is rated for continuous service up to 650°C. For higher temperatures, use W-CSP 900 (up to 900°C), W-CSP 1000 (up to 1000°C), or W-CSP 1100 (up to 1100°C).
Is the cured paste as strong as calcium silicate boards?
Yes. After full curing and first thermal cycle, W-CSP 650 paste achieves ≥0.65 MPa compressive strength and 220–260 kg/m³ density — equivalent to Wedge W-LD 650 factory-pressed boards.
What is the maximum thickness I can apply in one coat?
Apply 10–25 mm per layer. Allow 4–8 hours surface drying between coats. Maximum total thickness is 100 mm. Air-dry 24–48 hours before controlled heat-up at ≤50°C/hour.
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