Three-dimensional gaseous transfer within cellular plastic insulation and its consequences

The requirement for producing environmentally friendly plastic foam results in the replacement of the traditional blowing agents, chlorofluorocarbons (cfcs). With zero ozone depletion potential alternatives. The authors present a 3D gaseous transfer model and a simplified mechanical model. Thermal ageing and average volume change of ozone depletion potential foams with different facings are addressed. A formula has been suggested to correlate the elastic modulus and the reduced density of rigid foams over the whole foam density range.