Morning, All,
This is one for Graham really. I'm looking, please, for your valuable
assistance to determine the best methods, solvents and equipment for
completely stripping Humiseal 1B31 from Board Assemblies.
The boards are military avionics boards, the volume/qty that require
stripping is low, but they need to be cleaned well enough to avoid coating
residues contaminating connector pins and getting inside unsealed
components that weren't intended to be internally coated.
Can thinners/solvents be recycled or must they be disposed of once the
coating reaches a certain concentration?
At what concentration level does the coating in the solvent cause as much
contamination as it removes?
How is it measured?
I haven't had to strip boards for a while, and when I did, the only
facility we had were three small tanks of humiseal thinner to soak/strip,
wash and final rinse the boards of coating, then doing a DI water wash on
them. The first tank was emptied and cleaned quite ofen, the wash tank then
became the strip tank, the rinse tank became the wash tank and the cleaned
out strip tank then became the rinse tank. I'm hoping there is something a
little more sophisticated now that doesn't involve soaking the boards, as
this method allows a lovely thin coating of humiseal to get into every nook
and cranny there is, and it was impossible to prevent it getting where you
didn't want it.
Does anyone have a set-up they can recommend and send me details about?
Many TIA's
Peter Duncan
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