| 摘要 |
To replace cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising, on a weight basis, 80 to 97 % of (n-perfluorobutyl)ethylene, 0.5 to 20 % of isopropyl ether and 0 to 10 % of isopropanol. These three compounds form a positive azeotrope (B.p. = 54.8 DEG C at normal pressure). The composition, optionally stabilised, can be employed for cleaning solid surfaces, in particular for defluxing printed circuits and for degreasing mechanical components. |
