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March 2002

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Mon, 25 Mar 2002 10:20:08 -0600
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So I take it from the responses so far that no-one has carried out any
testing to determine the length of time they are able to leave electronic
assemblies in solvent strip tanks?

*Well, yes and no.  I occasionally get the same situations that you
describe and am asked if the assembly is still good.  We do some testing on
the hardware to see if we notice any real change or degradation of
properties.  That becomes part of our experience, not part of the
specifications or work instructions for operators.  And, the data is only
good for that solvent, for that exposure, on that solder mask, on that
laminate, etc.  It is not an exhaustive testing to determine process
windows by any stretch of the imagination.

Leaving an assembly in for 'the shortest possible time' is ok in theory but
it isn't a specification for operators to work by.  Does this mean that we
are all relying on manufacturing operatives to make their own decisions on
how long to leave assemblies in for (do they have the training to make
decisions like that)?

*No, the operators do not have the training for that.  This is why we
employ materials experts or Experts On Call, to answer the questions when
they come up.  In our work instruction, we do use "minimal time" and so on.
The operators understand that.  We don't put in "up to one hour" because
some might take it the wrong way and use all of that time, if they figure
it acceptable.

Doug Pauls

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