Joe,

I briefly looked into these.  Opted not to use them based upon two things, 1) Machine vendor wanted to know what they were made of and Bivar would not tell me what they were made (proprietary ya know), and 2) Machine vendor suggested that it would shorten my filter cartridge life.  Our system is a closed loop DI batch washer.

Past experience with plastic spacers was too much time spent trying to put them on the components.  We went to formed leads to get the same result. But, this is just my opinion.

Phil Nutting

-----Original Message-----
From: Kane, Joseph [mailto:[log in to unmask]]
Sent: Wednesday, January 29, 2003 1:30 PM
To: [log in to unmask]
Subject: [TN] Wash-Away Spacers


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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