... pervasion are all lower than those of other board heat preservation materials and they have the characteristic of ... has been widely used in the fields of heat preservation and heat insulation in the construction industry , frost resistance of ... power ( k w ) 75 5590 9055 55Thickness of board ( mm ) 20,25,30,40,5060,75,10040 ... 12020,50,30,40,5060,75,100Width of board ( mm ) 600,900,1200600,900,1200600,900 ...