| abstract |
A working fluid composition for a compression type refrigerator, comprising: n (A) a refrigerant composed of ammonia or at least one hydrofluorocarbon having the number of carbon being not more than 2 and containing no chlorine; and n (B) a lubricant for the refrigerator, said lubricant comprising 100 parts by weight of a synthetic oil and 0.5 to 10.0 parts by weight of at least one benzotriazole derivative expressed by the following formula (I). ##STR1## in which R 1 is hydrogen or an alkyl group having the number of carbons being 1-10, and R 2 and R 3 independently indicate an alkyl group having the number of carbons being 4-18. |