Way it consists of fluorine-containing ketone and the organicity composition the azeotropy and azeotropy, constituent

摘要

PROBLEM TO BE SOLVED: To obtain a new composition needing no worry about the depletion of ozone layer, having little greenhouse effect and keeping excellent properties such as cleaning activity and low toxicity which are characteristic to a chlorine- containing HCFC-based hydrocarbon or a chlorine-containing hydrocarbon. SOLUTION: This composition is composed of 3,3,4,4,5,5,6,6,6- nonafluorohexan-2-one expressed by the formula CF3 CF2 CF2 CF2 COCH3 and at least one kind of organic solvent selected from methanol, ethanol, 2-propanol, methylene chloride and trans-1,2-dichloroethylene.