When purchasing rock wool boards, focus on fire resistance rating, density, thickness, water repellency, tensile strength, and supply chain stability to ensure the material meets engineering specifications while effectively controlling overall costs.
Core Performance Parameters Must Meet Standards
Fire Resistance Rating: Class A non-combustible materials must be selected, especially for high-rise buildings or densely populated areas. An authoritative test report (such as GB 8624-2012 standard) is required.
Density (Bulk Density): For external wall insulation systems, high-density rock wool boards with a density ≥140kg/m³ are recommended to ensure wind pressure resistance and system stability; 100–120kg/m³ can be used for partition walls or roofs.
Thermal Conductivity: Should be ≤0.040 W/(m·K). A lower value indicates better insulation performance; in cold regions, an even lower value (such as 0.035) is recommended.
Tensile Strength: The tensile strength perpendicular to the board surface should be ≥ 7.5 kPa (thickness 50–100 mm) to prevent the risk of detachment.
Water Repellency: ≥ 98% to ensure long-term use in humid or rainy areas without water absorption or mold growth.
Specifications and Construction Compatibility
Standard Size: Commonly 1200×600 mm, must match the on-site construction module to reduce cutting waste.
Thickness Selection: 80–100 mm is recommended for severely cold northern regions to improve insulation performance; 50–80 mm is sufficient for energy-saving needs in temperate southern regions.
Seam Error: Controlled within 2 mm to avoid thermal bridging and affecting overall insulation performance.