摘要 |
PROBLEM TO BE SOLVED: To provide a refrigerant composition being an azeotropic mixture comprising 1,1,1,2,3,3,3-heptafluoropropane and isobutane and having a boiling point lower than that of each constituent refrigerant. SOLUTION: This refrigerant composition is obtained by forming an azeotropic mixture comprising 90-70wt.% 1,1,1,2,3,3,3-heptafluoropropane and 10-30wt.% isobutane. |