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Hot Sales Insulation Material Basalt Rock Wool Board Soundproof Rock Wool Board. Superior Sound Absorption: NRC rating of 0.75-0.95 effectively reduces noise propagation in buildings. Durable & Stable: Resistant to acid/alkali corrosion with a long service life and high chemical stability. Eco-Friendly Material: Made from natural basalt rock, free of harmful substances and safe for health. Flexible Customization: Full customization, minor customization, and design-based options available. Fast Lead Time: Peak and off-peak season delivery within 15 workdays with competitive pricing.