Heavy grade Styrofoam may have different values of the drag coefficient of diffusion of water vapor, which lie in the range from m = 20 m = 100. When calculating the dew point should be used the most is not beneficial for building construction value. Heat resistance of polystyrene When using polystyrene has virtually no lower limit. Volume compression should be considered in cases when it is necessary for the temperature conditions (eg in the construction of warehouses of refrigerators). When operating at high temperatures the value of the maximum temperature depends on the duration and temperature effects on the mechanical load on the foam.
During short periods of time slabs of polystyrene PSB-S can withstand temperatures of 110 C allowing, for example, intermittent contact with hot bitumen. In cases of permanent the impact of higher temperatures is recommended not to exceed 90 C to avoid deformation and shrinkage. The lower limit of temperature for polystyrene is: -180 C. Comfortable with the strong temperature changes. Fire resistance polystyrene foams are all PSB-S refers to a group of flammable materials and izgotovlevayutsya of materials containing fire retardant – flame retardant, which gives the material property of self-extinguishing and comply with GOST 15588-86. Operating temperature of polystyrene from -200 to +85 C. The heat of combustion of polystyrene is 40 MJ / kg, ie 15 kg/m3 – approximately 600 MJ / kg of 20 kg/m3 – approximately 800 MJ / kg of 25 kg/m3 – approximately 1000 MJ / kg Styrofoam is a fire in an open flame with the release of soot formation and burning of falling drops.