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18mm 20mm 24mm Non-Asbestos Calcium Silicate Board for Floor. Asbestos-Free Safety: 100% asbestos free composition ensuring safe indoor and outdoor usage. Class A Fire Resistance: Incombustibility Class A certified for superior fire safety performance. Sound Absorption: Effective sound absorption up to 48db for quieter environments. Customizable Thickness: Thickness customizable from 6mm to 24mm to meet specific needs. Large Production Capacity: Annual output of 20 million square meters with 10,000 pcs/day. Professional After-Sales: Onsite installation and online technical support available globally.