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Fiber Cement Explosion-Proof Tunnel Wall Panel for Defense Bunker Linings. Exceptional Durability: Engineered for 50+ years of service life with minimal maintenance. Customizable Dimensions: Thickness ranges from 2mm to 250mm to fit specific project needs. Customizable Surface Finish: Available in Glossy, Matte, or Brushed finishes. Cost-Effective Installation: Modular design reduces project costs by up to 30% with rapid installation. Excellent Corrosion Resistance: Resists acids, alkalis, salt spray, and moisture effectively. High Sound Insulation: Provides 20-40dB sound insulation and 40%-80% sound absorption.