Cleaning composition based on 1,1-dichloro-1-fluoroethane, methyl formate and methanol
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United States of America Patent
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Oct 6, 1992
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N/A
app pub date -
Feb 7, 1991
filing date -
Feb 7, 1990
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Expired
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Abstract
For replacing cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising 55 to 79.5% by weight of 1,1-dichloro-1-fluoroethane (F141b), 20 to 40% by weight of methyl formate and 0.5 to 5% of methanol. These three compounds form a positive azeotrope (b.p.=28.3.degree. C. at atmospheric pressure). The composition, which may be stabilized, can be used for cleaning solid surfaces, in particular for removing flux from printed circuits and for degreasing mechanical parts.
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