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Abm® MB40 Multifunctional Building Insulation/Acoustic/Firestop Rock Wool Board. A-Class Fireproof Safety: Non-combustible material maintaining structural integrity during fires to aid evacuation. Excellent Water Repellency: 99% water repellency rate prevents moisture penetration and ensures long-lasting performance. Customizable Dimensions: Thickness adjustable from 50-150mm with various faced options like Aluminum Foil. Eco-Friendly Manufacturing: Green production with no solid waste, waste water, or ultra-low gas emissions.