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EC number: 473-390-7 | CAS number: -
See attachment for infrared (IR) spectrum of FC-770. Average cross-section in the absorbance range of ozone (1000 - 1100 cm-1) was 0.10 x 10-18 cm2 molecule-1, which is less than the value (0.148) that would indicate that the radiative forcing should be corrected for confounding by ozone absorbance. Instantaneous radiative forcing was adjusted using a "cloudy-sky" factor of 1.07. The adjusted radiative forcing is 0.71 W∙m-2∙ppbV-1. Assuming an atmospheric lifetime range of 1500-4000 years, the 100-year GWP of FC-770 is 11,200 - 11,400 was calculated for this study summary using the WMO 1998 model with updated CO2 response and forcing. The 100-year GWP is, to a good approximation, independent of lifetime for essentially inert (lifetime >1000 years) compounds. The reported value is rounded to two significant digits for this study summary, for a 100-year GWP of 11,000. A 20-year GWP of 8,100 was also determined.
The 100-year GWP values for reference compounds were determined in a separate study (E11-0095) using the approach described above. The values are essentially identical to those reported in the literature (see Table).
Table, Calculated and reported GWPs for reference compounds
100 yr GWP
3M Environment Lab Calculation
IPCC AR4 Report
Potential effects of FC-770 on climate were addressed by calculation of 100-year integrated global warming potential (100-year GWP). A high-resolution infrared spectrum was taken using a protocol following EPA method 320. Integrated IR cross-section and radiative forcing were calculated using the approach of Pinnock et al (J. Geophys. Res., 100, 23227-23238). Atmospheric lifetime was determined elsewhere in this dossier. GWP was calculated for this study summary using the WMO 1998 model with updated CO2 response and forcing. The integrated radiative forcing was 0.71 W∙m-2∙ppbV-1. The 100-year GWP by this method is 11,000. A 20-year GWP of 8,100 was also determined.
No testing guideline has been promulgated to determine global warming potential. However, the infrared cross-section data were collected according EPA method 320, and the radiative forcing and GWP were calculated by methods accepted by IPCC. The overall approach used in this study was able to accurately reproduce GWP of several standard chemicals which have been reported in IPCC literature. Therefore, this study is classified as reliable without restrictions.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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