On Sun, Apr 23, 2006 at 10:51:43PM -0400, Marvin Dickens wrote: > Karel Kulhavy wrote: > >Is it true that PCB's should be washed by isopropyl alcohol and not > >ethanol because ethanol has small molecules that creep into the part > >cases and wreak havoc there? > > > > > I've never heard of washing PCB's in ethyl alcohol or isopropyl alcohol. > In fact, - Yuk. > > Both isopropyl alcohol and ethyl alcohol are both reasonably flammable > at 70% purity or above. > Further, isopropyl alcohol has a low vapor pressure. In the long term, > without a well thought out > ventilation system, flash fires would occur (Not if- but when....). > > We wash our boards in a mild solution of distilled water, clear ammonia > and a mild surfactant. > This is followed with a wash with distilled water. The boards are then > dried for several > hours in a drying oven.
But does ammonia dissolve rosin? CL< > > > > Best > > > Marvin
