Compositions based on 1,1,1,3,3-pentafluorobutane and methanol for the cleaning and/or drying of solid surfaces
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United States of America Patent
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Dec 7, 1993
Grant Date -
N/A
app pub date -
Apr 30, 1992
filing date -
May 2, 1991
priority date (Note) -
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Abstract
To replace cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention proposes a composition comprising, by weight, 93 to 99% of 1,1,1,3,3-pentafluorobutane (F365 mfc) and 7 to 1% of methanol. These two compounds form a positive azeotrope (b.p.=36.5.degree. C. at normal pressure). The composition, optionally stabilized, can be used for the cleaning and/or drying of solid surfaces, in particular for the removal of flux from printed circuits and for degreasing mechanical parts.
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