Azeotrope-like compositions and their use

An azeotrope-like composition including perfluorobutyl ethyl ether, wherein said ether consists essentially of about 18 weight percent perfluoro-n-butyl ethyl ether, and about 82 weight percent perfluoroisobutyl ethyl ether, and one organic solvent, and is selected from the group consisting of:

• (i) compositions consisting essentially of the ether and pentafluoro-1-propanol, wherein the compositions, when fractionally distilled, form a distillate fraction that is an azeotrope consisting essentially of about 75 weight percent of the ether and about 25 weight percent of the pentafluoro-1-propanol that boils at about 67° C. at about 730 torr;
• and
• (ii) compositions consisting essentially of the ether and hexafluoro-2-propanol, wherein the compositions, when fractionally distilled, form a distillate fraction that is an azeotrope consisting essentially of about 35 weight percent of the ether and 65 weight percent of the and hexafluoro-2-propanol that boils at about 56° C. at about 731 torr.