... with other products, Xinzhao board maintains high insulation value and ensures a long term insulation period.2. Excellent water and vapor resistant ... Board is totally closed cell foaming, the structure is rigid , unlike other foaming insulation board so fragile. It is so light to ... Stability70ºC±2ºC,48h%≤1.5GB/T 10295 Extruded Polystyrene (XPS) Insulation Board