This paper will address significant issues related to discrepancies between the atmospheric measurements of HCFC142b and estimated emissions from production and use data, and attempt to improve the agreement between them. Current discussions and regulations regarding materials used to make extruded polystyrene foam (XPS) are using insufficient and incorrect data. This poor information may affect current and future use of an important energy management product. This paper presents new data and information regarding emissions of HCFC142b used to make XPS products. The data are from a variety of governmental and industry sources. Furthermore, as HCFC142b is being phased out of use in developed XPS markets, its use is increasing significantly in emerging markets, particularly China. The new information is used to develop a bottom-up model for HCFC142b that reasonably estimates atmospheric measurements. It is a reliable tool for assessing use scenarios of HCFC142b, and can be used to develop useful management actions for the use of this material, and develop appropriate policies for replacement materials for HCFC142b in XPS products.
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