{HEAD ~ The protective sealing} impregnant of {TAIL ~ this invention} must be highly resistant to the more degrading and reactive R22 chlorofluorocarbon refrigerant, as a gas, or as a liquid in any concentration in a refined petroleum base or other lubricating oil, or in a foamed state, at temperatures of up to about 185° C 
impregnant of
{ HEAD ~ The protective sealing } impregnant of { TAIL ~ this invention } must be highly resistant to the more degrading and reactive R22 chlorofluorocarbon refrigerant , as a gas , or as a liquid in any concentration in a refined petroleum base or other lubricating oil , or in a foamed state , at temperatures of up to about 185 ° C
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