DARQ Rockwool Insulation Board is a resin-bonded stone wool (rockwool) board and slab engineered for thermal insulation, acoustic control and fire protection in buildings and industry. Made from molten basalt stone wool bonded with a thermosetting resin, it holds its shape, resists fire up to 750°C, and stays stable through years of service. Available in densities from 48 to 144 kg/m³, in plain or aluminium-foil-faced form.
Product Overview
Rockwool boards (also called stone wool slabs) are produced by spinning molten basalt rock into fine fibres, then bonding them with resin into a rigid, dimensionally stable board. The result insulates against heat and sound while being completely non-combustible — one material covering thermal efficiency, acoustic comfort and passive fire safety. Higher densities give greater rigidity and compressive strength for load-bearing and industrial duty. Explore our full range of mineral wool insulation.
Key Technical Features
Non-combustible stone wool — fire-safe up to 750°C service temperature
Densities 48 / 64 / 96 / 128 / 144 kg/m³ to suit every application
Low thermal conductivity — from 0.036 W/m·K
Excellent acoustic absorption for walls, floors and ceilings
Water-repellent — resists moisture, helps prevent corrosion under insulation (CUI)
High compressive strength — 240 kg/m² min at 10% deformation
Surface burning FSI 0 / SDI 0 (ASTM E84)
Available plain or aluminium-foil-faced; custom sizes on request
Technical Specifications
Property | Standard | Value |
Material | — | Resin-bonded stone wool (basalt rock) |
Density | — | 48, 64, 96, 128, 144 kg/m³ |
Thickness | — | 25 – 100 mm |
Standard size | — | 600 × 1200 mm (custom available) |
Facing | — | Aluminium foil or plain |
Max. service temperature | IS 8183 | Up to 750 °C |
Leachable chlorides | ASTM C871 | 10 ppm max |
Surface burning (FSI / SDI) | ASTM E84 | 0 / 0 |
Shot content | IS 8183 | 25% max |
Incombustibility (weight loss) | IS 8183 | 5% max |
Moisture content | IS 8183 | 2% max |
Water vapour absorption | IS 8183 | 2% max |
Fibre diameter | IS 8183 | 7 µm max |
Sulphur content | IS 8183 | 0.2% max |
Recovery after compression | IS 8183 | 90% min |
Alkalinity (pH) | IS 8183 | 7 – 10 |
Resin content | IS 8183 | 3.5% max |
Compressive strength (10% def.) | ASTM D1621 | 240 kg/m² min |
Linear shrinkage | IS 8183 | 2% max |
Compliance | — | IS 8183 · ASTM C612 |
Thermal Conductivity (W/m·K)
Mean temp (°C) | 50 | 100 | 150 | 200 | 250 | 300 |
λ | 0.036 | 0.042 | 0.051 | 0.064 | 0.073 | 0.084 |
Why DARQ Rockwool Board
Stone wool does three jobs in one board — it blocks heat, absorbs sound, and won’t burn. Being non-combustible, it adds genuine fire safety to a structure rather than just insulating it, and its water-repellent fibres hold performance in damp conditions where other materials fail. DARQ supplies project and OEM quantities with full documentation, in the density and facing matched to your actual duty — not generic stock.
Minimum Order Quantity
Project and bulk quantities supplied to schedule; sample boards available on request.
Technical Support & Pricing
For density selection, thickness sizing or project pricing, contact our technical team — we respond within 24–48 hours.
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