Overview
National Standard Rock Wool is a premium insulation material produced by melting basaltic rocks at 1500°C and spinning them into fine fibers. Compliant with Chinese GB/T standards (e.g., GB/T 19686-2015), it represents the highest quality tier in China's insulation market. The material undergoes strict quality control for fiber diameter (typically 4-7μm), shot content (<10%), and binder distribution. Unlike ordinary rock wool, GB-compliant products guarantee consistent thermal performance (λ≤0.044 W/m·K) and mechanical strength (tensile strength >7.5 kPa). Major Chinese manufacturers use advanced centrifugation technology to achieve homogenous fiber structures, making it suitable for critical applications like high-rise buildings and petrochemical facilities.
Physical and Chemical Properties
The material exhibits exceptional thermal stability with a working temperature range of -260°C to +700°C. Its fibrous structure creates millions of tiny air pockets, delivering thermal conductivity values between 0.036-0.042 W/m·K at 25°C. The random fiber orientation provides isotropic insulation performance. Chemically, it consists of >95% inorganic oxides (SiO₂ + Al₂O₃ + CaO + MgO), ensuring pH stability (7-8.5) and corrosion resistance. The hydrophobic version achieves >98% water repellency through silicone-based treatments. Key mechanical properties include compression resistance (10% deformation at ≥40 kPa for 100 kg/m³ density) and dimensional stability (<1% linear shrinkage at 600°C).
Main Applications
In construction, it's widely used for external wall insulation systems (ETICS), roof insulation, and fire barriers in curtain walls. The material's A1 fire rating makes it mandatory for public buildings under China's GB 50016 fire code. Industrial applications include insulation for pipelines, boilers, and power plant equipment where temperatures exceed 400°C. The automotive and shipbuilding industries utilize specially engineered rock wool for acoustic insulation, with sound absorption coefficients reaching 0.8-1.0 at high frequencies. Emerging applications include modular buildings and cleanroom partitions, where its mold-resistant and particulate-free properties are valued.
Safety and Storage
While non-carcinogenic (exempt from IARC Group 3), installation requires dust masks (NIOSH N95+) and protective clothing to prevent temporary skin itching. The EUCEB-certified variants have soluble fiber content <1%, eliminating long-term health concerns. Storage should avoid stacking heights exceeding 2 meters to prevent compression damage. Pallets must be kept 10cm above ground with moisture-proof wrapping. Shelf life is typically 12 months when stored properly. Fire safety during storage is ensured by the material's inherent non-combustibility.
B2B Procurement Guide
Priority should be given to manufacturers with GB/T 19686 and ISO 9001 certifications. For large projects, request factory inspection reports for thermal conductivity (tested per GB/T 10294) and combustion characteristics (GB 8624). Key procurement parameters include: density tolerance (±10%), thickness tolerance (+5/-3 mm), and fiber orientation (prefer vertical-laid for better tensile strength). For cost-sensitive projects, consider regional production bases in Hebei or Shandong provinces, but verify raw material sources (basalt vs. slag blends). Minimum order quantities typically start at 20 tons for standard products.
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