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OEM/ODM Product Customization High Quality Sandwich Lightweight Easy Installation Composite Rock Wool Board. Superior Sound Absorption: NRC rating between 0.75 and 0.95 for effective noise reduction. Durable Basalt Material: Made from basalt rock and slag, resistant to aging and high compressive strength. Water Repellent: Hydrophobic properties ensure the material repels water effectively. Easy Installation: Lightweight design allows for quick and simple installation on walls and roofs. Comprehensive Warranty: Includes 12-month warranty with free technical guidance support.