| 摘要 |
(Quasi) azeotropic compositions to replace CFC and HCFC based compositions for cleaning and degreasing solid surfaces, containing defined proportions of 1,1,1,3,3-pentafluorobutane, dichloromethane, methanol and 1,1,1,2,3,4,4,5,5,5-decafluoropentane. Azeotropic or quasi azeotropic compositions comprising: (a) 45-65 (50-60) % 1,1,1,3,3-pentafluorobutane; (b) 30-50 (35-45) % dichloromethane; and (c) 1-10 (2-5) % methanol; (d) 0.1-2 (0.2-1) % 1,1,1,2,3,4,4,5,5,5-decafluoropentane. |
