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Abstract
Restrictions in the use of CFC blowing agents and difficulties in estimating long term thermal resistance of new gas filled cellular plastaics led to the establishment of an expert task group with a mandate to review and improve R-value evaluation techniques. One, based on measurement of thermal resistance of thin material layers (scaling factors) appraoch was found to be applicable to homogeneous and uniform boards. In one case, the estimate was confirmed by long term R-value measurements performed on the actual product. Future research to extend application of the technique to non-uniform or to faced cellular plastic boards is recommended.
Restrictions in the use of CFC blowing agents and difficulties in estimating long term thermal resistance of new gas filled cellular plastaics led to the establishment of an expert task group with a mandate to review and improve R-value evaluation techniques. One, based on measurement of thermal resistance of thin material layers (scaling factors) appraoch was found to be applicable to homogeneous and uniform boards. In one case, the estimate was confirmed by long term R-value measurements performed on the actual product. Future research to extend application of the technique to non-uniform or to faced cellular plastic boards is recommended.
Date
9/1989
9/1989
Author(s)
F Edgecombe
F Edgecombe
Page(s)
26
26
Keyword(s)
cellular plastic; scaling factor; extruded polystyrene; thermal resistance
cellular plastic; scaling factor; extruded polystyrene; thermal resistance