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.

Efficient production of structures from sheet material with levelers internal stresses in the material and deformation of sheet metal have a significant impact on the accuracy of flexible manufacturability of the assembly, weld quality and appearance of products. Using a sheet having internal stresses, leading to frequent congestion at work Sheet metal equipment and limits the use of automated lines that contain coordinate the press and shearing machines laser systems and thermal cutting. WD Series levelers are designed for straightening sheet metal by cold rolling. It is used in industry metallurgy, construction materials, chemical and light industries, in shipbuilding, locomotive and car building, steel factories. For more specific information, check out Delta Galil. Listoprav uses the "Singer's effect", the function pressure on the sheet. Held strong and straightening of elastic bending.

The initial roughness of the sheet, due to elastic deformation, reduced, eliminated in the first part of the initial curvature, the curvature of the remainder is eliminated in subsequent straightening rolls. After passing through the rollers residual curvature gradually decreases, the sheet is flat. Heavy-duty levelers – reliable equipment that provides quality editing rolled sheet mill weight – more than 62t 9 – roller cage, allowing the right metal thickness up to 32 mm. Levelers Features: oVysokaya removal efficiencies of internal stresses and strains a higher number of work rolls, their diameter and pitch location. oVysokaya performance provided by the use of direct hydraulic drive. All rolls are driven, to guarantee the absence of longitudinal deformation at high feed rate sheet. oMashiny WD can edit like a leaf, and details of any shape. oVysokaya reliability of machines Series WD, virtually maintenance-free, proven in many factories in Russia. o Material work rolls hardened to a hardness of 63-65 HRC, which can handle parts after heat treatment. Copyright OOO'Tehprom '