Hi Joe,

We use them quite a bit for standing off axial parts, and there's a few boards that we stand off crystals, oscillators, and can transistors too.

We don't use the effervescent type, never have had a problem  washing the normal ones away. We clean in an Electrovert H-500 inline cleaner using straight DI water, and we have an Electrovert MCS-1000 that we use Kyzen XJN in. Both machines clean the spacers just fine, with no ill effects with either machine.

We do quite a bit of conformal coating (Acrylic and Urethane), and never have had an issue because of the spacers...

Hope this helps,

-Steve Gregory-


Anyone had success using wash-away spacers during wave-soldering, then
removing them by aqueous cleaning?  We're looking at them mostly to
control standoff of transistor cans and vertically-mounted resistors.

Looking at the Bivar catalog, spacers come in two types, normal and
"effervescent", which dissolve more quickly.

Do they wash away completely?  Leave any residue that affects conformal
coat adhesion?  Any problems with the materials reacting with the wash
chemistry, either saponifier or alcohol based?

Joe Kane
BAE SYSTEMS Controls
Johnson City, NY


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