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Calcium Silicate Board--Professional Passive Fireproof Panel. Grade A1 Incombustibility: Meets A1 incombustibility standard with fire resistance up to 4 hours. 100% Non-Asbestos: Safe material with no radiation or pollution when exposed to fire. 20-Year Warranty: Comprehensive 20 years quality warranty for good installation. Moisture & Pest Proof: Resistant to moisture, fungus, and insects for durable performance. High Bending Strength: Cross bending strength of 6~8MPa ensures structural durability. Easy Installation: Simple to process and install for ceilings, partitions, and ducting. Versatile Application: Suitable for commercial, industrial, transportation, and public buildings.