| abstract |
To replace the cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising by weight 60 to 90% of 1,1-dichloro -1- fluoroethane (F141b), 9 to 33% of 1,1,1,3,3-pentafluorobutane (F365 mfc) and 1 to 7% of methanol. These three compounds form a positive azeotrope (bp = 29.1 ° C at normal pressure).n n n The composition, possibly stabilized, can be used for cleaning and / or drying solid surfaces, in particular for defluxing printed circuits and for degreasing mechanical parts. |