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High Quality Fire Retardant Blend Polyol for The Continuous Line, Color Steel Sandwich Panel General Flame Retardant Rigid PU Foam. Excellent Dimensional Stability: Dimensional change within 0-2.0% under standard testing conditions. Strong Steel Bonding: Provides good bonding effect with steel for durable sandwich panels. Low ODP: Environmentally friendly with low Ozone Depletion Potential. Flexible Customization: Offers full customization, minor customization, and sample-based options.