PURPOSE: To obtain the subject incombustible mixture having characteristics comparable or superior to those of conventional fluorocarbons and suitable as a fluorocarbon substitute or cleaning solvent by using R244ca, R225cb and dichloromethane as essential components.
CONSTITUTION: The objective azeotropic mixture is composed of (A) 17wt.% of 1-chloro-2,2,3,3-tetrafluoropropane (244ca), (B) 24wt.% of 1,3-dichloro-1,1,2,2,3- pentafluoropropane (R225cb) and (C) 59wt.% of dichloromethane and the pseudo- azeotropic mixture is composed of 7-35wt.% of A, 9-42wt.% of B and 45-73wt.% of C, preferably 12-22wt.% of A, 19-29wt.% of B and 54-64wt.% of C. The mixture has azeotropic point, causes little variation of composition in recycling and can be used in similar manner as conventional simple fluorocarbon. It has higher dissolving power than conventional R113 when used especially as a solvent.
KITAMURA TATEO
WATANABE NAOHIRO
ASANO AKIO
KAMIMURA TORU
