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Hot Sales Insulation Material Basalt Rock Wool Board Soundproof Rock Wool Board Price. High Sound Absorption: NRC rating of 0.75-0.95 effectively absorbs and reflects sound waves. Durable & Chemically Stable: Resistant to acid and alkali corrosion with a long service life. Eco-Friendly Material: Made from natural basalt rock, free of harmful substances. Flexible Customization: Full customization, minor customization, and design-based options available. Fast Sample Delivery: Free samples available with delivery within 1-3 days after freight confirmation.