WPC Fire Retardant Soundproof Thermal Insulation Wall Panel An exterior WPC wall cladding panel built around three performance gaps in the market: Class B1 fire retardant safety, sound and thermal insulation , and an anti-corrosion wood grain surface for long-lasting facades. Key Selling Points Fire Retardant (Class B1): Inorganic fillers and a flame-retardant formula slow flame spread, suitable for commercial and public facades. Sound & Thermal Insulation: The multi-layer