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High Compressive Closed Cell Moisture-Proof XPS Composite Waterproof Backing Board for Bathroom/Basement /Underground Garage. Customizable Dimensions: Available in 10/12/20/30/40/50mm thickness and 600*2500mm/1220*2440mm size, or fully customized. Customizable Colors: Offered in Yellow, White, or fully customized colors to match project requirements. Fire Safety Compliance: Achieves B1 fire rating with no HCFC blowing agents and para-safety level 1ZA smoke toxicity. Professional After-Sales Support: Includes on-site engineer guidance and comprehensive technical support for construction.