XPS foamed sheet, also named as Polystyrene Extrusion Plastic Sheet (XPS for short) has a perfect closed-pore alveolate structure. Its density, water absorption, coefficient of heat conducting and the coefficient of steam pervasion are all lower than those of other sheet heat insulating materials and they have the characteristics of strong intensity, light material, airtight, anticorrosion, ageing resistance, low cost, etc. It has been widely used in the fields of heat preservation in the construction industry and the highway, railway, airport, square of the heat preservation and household fitment. It is the generally acknowledged and the best heat insulator in the market at present.The Comparison Between PLASTECH XPS Foam Board and Other Heat Insulating Materials ItemXPSPLASTECHEPSPUDensitykg/m3)≥30≤1820-40Thermal Conductivityw/m.k)≤0.0300.04and will increase year by year0.022-0.038Structurecompactrelative vacuumlooseParylene FcompactWater Absorptionkg/m3≤1.0%8%3%Durabilityexcellentunchange for 50yearspoorchange after one yearpoor(change easily)Compression StrengthKpa)25050150Thermal Resistance10years80%10years60%70%Toxic GasNoYesYesCO353Freeze-thaw ResistancestrongeweakweakSize Variation Ratio1%3%10%WaterproofstrongeweakweakThicknessthinthickthick