PURPOSE: To obtain the subject incombustible composition having characteristics comparable or superior to those of conventional fluorocarbons and suitable as a fluorocarbon substitute or cleaning solvent by using R244ca, R225ca and 2,2-dimethylbutane as essential components.
CONSTITUTION: The objective azeotropic composition is composed of (A) 39wt.% of 1-chloro-2,2,3,3 tetrafluoropropane (R244ca), (B) 19wt.% of 1,1-dichloro-2,2,3,3,3- pentafluoropropane (R225ca) and (C) 42wt.% of 2,2-dimethylbutane and the azeotrope-like composition is composed of 7-61wt.% of A, 8-71wt.% of B and 5-72wt.% of C, preferably 34-59wt.% of A, 14-49wt.% of B and 5-47wt.% of C. An azeotrope-like composition is produced by using a 5-8C hydrocarbon mixture composed mainly of 2,2-dimethylbutane as the component C and adjusting to the above compositional ratios. The composition has azeotropic point, causes little variation of composition in recycling and can be used in similar manner as conventional simple fluorocarbon.
KITAMURA TATEO
WATANABE NAOHIRO
ASANO AKIO
KAMIMURA TORU
