What is the hydrophobicity of cement long exterior wall insulation rock wool board?
Release Time: 2026-05-18
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What is the hydrophobicity of cement long exterior wall insulation rock wool board? Hydrophobic refers to liquid water (such as rainwater), while hygroscopic refers to gaseous water (such as water vapor in the air). The working environment of cement plants has high humidity. When purchasing, it is recommended to pay attention to indicators such as water repellency rate ≥ 98% and moisture absorption rate ≤ 1.0%. Rosewool Insulation Refractory Co.,Ltd. provides insulation materials for various industrial plants, with support solutions for external and internal insulation. There are countless cooperation cases with cement plants, and the reputation of rock wool board cooperation customers is excellent, worthy of your trust!
We all know that the cement faced rock wool composite board has a layer of cement polymer mortar covering its surface, which can further enhance the overall waterproof and anti-seepage ability. The reason why ordinary rock wool board can achieve high hydrophobicity is because special hydrophobic agents (such as modified organosilicon) are added during the production process, which forms a molecular level "hydrophobic film" on the surface of rock wool fibers, effectively preventing moisture from entering.
High hydrophobicity rock wool board can maintain a low water absorption rate in humid environments, ensuring its stable thermal conductivity and long-lasting insulation effect. On the contrary, after low hydrophobicity rock wool board absorbs water, its thermal conductivity will significantly increase, leading to a decrease in insulation performance and even potential safety hazards such as detachment.
The hydrophobicity of exterior wall insulation rock wool board does not have an absolute fixed value, it depends on the specific type of product, production process, and brand quality. The rock wool board used for external wall insulation in cement plants should have a water repellency rate of not less than 98.0% according to national standards. The high-quality rock wool board products from Rosewool Insulation Refractory Co.,Ltd. can reach over 99%.
