Bare Rock Wool Blanket is a highly flexible, roll-form insulation material manufactured from natural volcanic basalt rock. Consisting solely of mineral wool fibers, needle-punched or felted into a uniform, resilient blanket without any surface facing (unlike foil-faced or wire-mesh variants).
Optimized for boilers and large tanks, this rock wool blanket features high-density 60-120 kg/m³ without any chemical binders that might outgas at high temperatures. It is also suitable for industrial and building applications requiring easy wrapping, high thermal resistance, and conformability around pipes, ducts, vessels, or irregular surfaces—typically used where additional protective coverings (e.g., jacketing or cladding) will be applied to contain fibers and provide mechanical protection.
Density: 80k ~120k
L*W: 3000/5000*600mm
Thickness: 50~100mm
Brand: Dongwutianzi or OEM
(Size can be customized)
| Product Performance | Enterprise Standard | National Standards | ASTM Standard |
|---|---|---|---|
| Shot content (Particle diameter ≥0.25mm) % | 4 | ≤6 | 4 |
| The average diameter of fibers (μm) | 4.2 | <7 | <7 |
| Thermal conductivity W/(m·K) Average temperature 70°C | ≤0.039 | ≤0.044 | ≤0.042 |
| Organic content % | 1.3 | ≤1.5 | -- |
| Hydrophobic rate % | 99 | ≥98 | ≥98 |
| Combustion performance | Class A | Class A | Class A |
| Chlorine ion content (ppm) | ≤10 | -- | ≤25 |
| Heat load shrinkage temperature (°C) | 700 | ≥600 | ≥650 |
| Density tolerance % | ±5 | ±10 | ±10 |
For Bare Rock Wool Roll Blankets, the advantages focus on their role as a fundamental, high-performance thermal barrier for large-scale industrial assets. Because they lack a rigid facing, they offer unique benefits in terms of flexibility and thermal directness.
Here are the top 5 product advantages for industrial insulation:
Bare rock wool blankets are engineered with a needle-felted structure that provides exceptional pliability. This allows the material to be tightly wrapped around large-diameter pipes, valves, and irregularly shaped vessels without the cracking or breaking that can occur with rigid board insulation. This ensures a snug, seamless fit that eliminates thermal bridges.
Unlike many synthetic insulation materials, bare rock wool maintains its shape and thickness even under extreme heat (up to 650°C). This dimensional stability is critical for industrial boilers and kilns, ensuring that the insulation does not shrink or sag over time, which would otherwise lead to dangerous hot spots on the equipment surface.
Made from natural volcanic basalt, bare rock wool is naturally fireproof. In industrial settings where flammable gases or high-heat processes are present, these blankets act as a passive fire protection system. They do not ignite, melt, or release toxic smoke, providing essential protection for structural integrity and personnel safety.
Without a foil or plastic vapor barrier, bare rock wool allows the insulated system to "breathe." This is particularly advantageous for preventing Corrosion Under Insulation (CUI) on carbon steel pipes, as moisture is not trapped against the metal. Furthermore, the fibers are chemically inert and low in chlorides, preventing chemical corrosion of the substrate.
Bare rolls are often the most economical choice for high-volume industrial projects. They offer a lower material cost compared to faced or stitched variants while still providing a low thermal conductivity. This leads to a rapid return on investment (ROI) through significantly reduced energy loss in steam and process heating systems.
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