WDS Ultra Microporous Board WDS Ultra is a flame retardent microporous board insulation board which has a low thermal conductivity giving you good insulation properties. The WDS board is not flammable and meets requirements according to DIN EN 13501-1 fire protection class A1. As the surface of the board is porous, it is sensitive to all liquids which can destroy the pore structure. The board is insensitive to high and low thermal shocks. FEATURES and BENEFITS: Microporous board Flame retardent Low thermal conductivity Good insulating properties Non-flammable Fire protection class A1 Insensitive to high and low temperature thermal shocks Non-hazardous substance APPLICATION RESTRICTIONS: Sensitive to all liquids including: Water, oil, petroleum spirit