摘要 |
PURPOSE:To provide the subject azeotropic and pseudoazeotropic composition capable of being employed as a CFC substitute and also having excellent characteristics as a cleansing solvent, etc., containing tetrachloro-1,2- difluoroethane and trichloroethylene in a specific ratio. CONSTITUTION:An azeotropic composition comprises 46.1wt.% of (A) tetrachloro-1,2-difluoroethane and 53.9wt.% of (B) trichloroethylene, and a pseudoazeotropic composition comprises 35-60wt.% of the component A and 40-75wt.% of the component B. The compositions can be employed for various uses such as a thermal medium or foaming agent similarly as the conventional CFC, and are especially most suitable as a cleansing solvent substitute for R113 because of having an excellent property for dissolving and removing flux, oils, etc., compared with the R113 as a solvent. Since the composition can be used similarly as the conventional CFC, the composition has an advantage not requiring the large change of the conventional techniques. |