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Sound Absorbing Wall Roof Lightweight High Quality Composite Rock Wool Board. Excellent Sound Absorption: Noise Reduction Coefficient (NRC) ranging from 0.75 to 0.95. Water Repellent Design: Hydrophobic properties ensure the material repels water effectively. Durable Construction: Resistant to aging with high compressive strength and mechanical durability. Free Technical Guidance: Complimentary expert support available for 12 months after purchase. Customization Available: ODM and OEM services allow customization from samples and designs. ISO Certified Quality: Manufactured under ISO 9002 and ISO 10012 quality system certifications.