| abstract |
1,1,1,3,3-Pentafluorobutane is made to be repeatedly and stably usable over long. The pentafluorobutane composition and the solvent composition for cleaning each comprises 100 parts by weight of 1,1,1,3,3-pentafluorobutane, 0.1 to 5.0 parts by weight of at least either of nitromethane and nitroethane, and 0.1 to 5.0 parts by weight of at least one member selected among 1,3-dioxolane, trimethoxymethane, trimethoxyethane, and 1,2-butylene oxide. |