X-FOAM® HBT 300 is an indigo blue thermal insulation board made of single-layer extruded polystyrene, with extrusion skin and 4 rabbeted edges. The boards have nominal compressive strength values of 300 kPa and are 600 mm wide, 1250 mm long and 30 to 160 mm thick. X-FOAM® HBT 300 has a fire classification of EUROCLASS E according to European standard EN 13501-1.