Properties: Insulation materials from PUR- foam are mainly closed cellular, hard foam materials. The amount of the closed cells is >90%. Polyurethane-foam is none aging, rot-proof and fungus resistant, it doesn’t decay and doesn’t have affinity to plasticized foils (e.g.: PVC-foils). PUR-foam reaches a WLG of 025 by gas diffusion resistant cover layers.
heat conductivity λ(R): 0,020-0,030 W/(m·K) spez.
heat storage capacity c: 1.200-1.400 J/(kg·K)
vapor diffusion resistance μ: 30-150 (∞ with gas diffusion resistant cover layer steam tight)
building material category: B 2 hardly inflammable
temperature resistance: 90°C (in the long run) 250°C (short term)
gross density ρ: 30-35 kg/m³
pressure resistance: >0,10 / >0,15 N/mm²
linear expansion coefficient: 5-8 ·10^-5 1/K
primary energy content: 800-1.500 kWh/m³
utilization roof: rafter insulation, ceiling and floor
insulation, basement ceiling insulation
basement: partly as perimeter insulation
Insulation for installation wires (heating)
Remarks: A heat conductivity of 0,020 W/(m·K) is only achieved by the application of HCFC in connection with gas diffusion resistant cover layers. By the year 1993, the ozone depleting CFC R II was used in the production of PUR. In the meantime it is not used any more. After changing the production procedure, CFC was replaced by propellants like pentane, isopentane, CO2 and by the nowadays rarely used H-CFC.
Petroleum products like polyisocyanate and polyol are the intermediate products in the production of polyurethane. PUR hard foam comes into being by a chemical reaction of fluid basic materials with supplement propellants. Pentane is used as a propellant, in small amounts CO2, too and rarely HCFC . The development is not yet closed in the sector of propellants.