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Modern Design Rock Wool Board for Boiler Thermal Insulation External Wall Supplier. Fireproof and Non-Combustible: Class A reaction to fire rating, ensuring safety in industrial and building applications. Excellent Sound Absorption: NRC rating of 0.75-0.95 for effective noise reduction in various environments. Durable and Stable Material: Made from basalt rock with high chemical stability against acid and alkali corrosion. Customization Available: Offers full customization, minor customization, and flexible options based on samples or designs. Professional Manufacturer: Over 10 years of experience with 100% inspection and ISO9001/ASTM compliance.