Mixture on the basis of 1,1,1,3,3 - pentafluorobutane, methylene chloride and methanol, for cleaning and / or drying of solid surfaces

摘要

the present invention relates to a mixture of 1,1,1,3,3 - pentafluorbutan, methylene chloride, methanol, and, if necessary, a stabilizer, a azeotrop forms and for drying, cleaning, degreasing and trockenreinigen of feststoffoberflu00e4chen is used, in particular, to entfernun g of lu00f6tzusu00e4tzen and kaltreinigung of printed circuit boards.