### Global Warming Potential

Perfluoroisopropyl morpholine (PIPM) (CAS Number: 3 38-84-1)
Summary: This document describes analysis conducted by 3M to determine a Global Warming Potential (GWP) for 

### perfluoroisopropyl morpholine . The format of this report is consistent with submittals to EPA for the use of Provisional GWPs. [1] Estimated CO 2 -equivalent emissions are obtained by multiplying the F-GHG mass emission s by the Global Warming Potential (GWP) for the individual fluorinated gases that com prise the flow. EPA has provided a table of 100-year time horizon GWP values for about 70 in dividual F-GHG, and specifies that these values are to be used for the purpose of comp uting CO 2 -equivalent emissions. [2] The regulation allows a facility to request a provision al GWP when clear scientific evidence exists to support such a value. Table A–1 does not list a GWP for perfluoroisopropy l morpholine (PIPM). As described in greater detail in a subsequent section, the atmosph eric lifetime of perfluoroisopropyl morpholine has been estimated as greater than 1,600 years; the radiative forcing has been measured and the GWP of perfluoroisopropyl morpholi ne has been estimated as 11,000 relative to CO 2 with a 100-year integration time horizon. Evidence Supporting Request: F-GHG Identity: Perfluoroisopropyl morpholine (PIP M)

Chemical Formula: C 7 F 15 NO

CAS Number: 1093615-61-2 Estimated GWP: 11,000 relative to CO 2 with a 100-year integration time horizon Data and analysis: Atmospheric lifetime was estimated by using perfluo romethyl morpholine (PMM) as a proxy as it is structurally similar to PiPM, containing o nly 2 more perfluorinated carbon groups than PMM while retaining the same morpholine functi onality. The atmospheric lifetime for PMM was derived from kinetic data reported by Ko [3 ]. Ko reported lower limits of atmospheric lifetime due to reaction with hydroxyl radical and O(1D) oxygen. These lower limits were used to estimate a total atmospheric li fetime of >1600 years. This value was used as a minimum value in GWP calculations. The radiative forcing was determined using the meth odology outlined in the IPCC [4]. Absorption cross-sections were obtained from the sp ectrum. The spectral data was divided into sections with bandwidth 10 cm -1 . Average absorption cross-sections for each band were calculated. The cross-sections were then weighted using factors reported in Pinnock et al

. [5]. The weighted cross-sections were summed over all bands to obtain the value for instantaneous radiative forcing. The adjusted radiative forcing is 0.71 W

· m -2

· ppbV -1

. Using these data in the equation referenced by the IPCC [4] to determine the GWP of a given substance, a GWP of 11,000 relative to CO 2 with a 100-year integration time horizon was established.1. "Mandatory Reporting of Greenhouse Gases: Additiona l Sources of Fluorinated GHGs;

Final Rule" , Federal Register 75:230 (December 1, 2010) p.7477 4.

2. "Table A-1 to Subpart A of Part 98—Global Warming P otentials" : Table A-1 in 40 CFR part 98, subpart A. 3. Ko, M.K.W. and D.T. Chang, Estimates of the Global Warming Potential of Propos ed Chemical Compounds. 1992, Atmospheric and Environmental Research, Inc. : Cambridge, MA 4. IPCC, 2007: Climate Change 2007: Impacts, Adapt ation and Vulnerability. Contribution of Working Group II to the Fourth Assessment. Repor t of the Intergovernmental Panel on Climate Change, M.L. Parry, O.F. Canziani, J.P. Pal utikof, P.J. van der Linden and C.E. Hanson, Eds., Cambridge University Press, Cambridge , UK, 976pp. 5. Pinnock, S., et al., Radiative forcing of climate by hydrochlorofluoroca rbons and hydrofluorocarbons. Journal of Geophysical Research, 1995. 100 (D11): p. 23227-23238.