... of steam pervasion are all lower than those of other board heat preservation materials and they have the characteristics of strong ... the fields of het preservation and heat insulation in the construction industry,frost resistance of the high way,railway ,airport,square and ... power (kw) 33 52Driving motor power(kw) 55 55Thickness of board (mm) 20,50,30,40,50,60,75,100Width of ...