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June 2005

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Subject:
From:
David Tremmel <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, David Tremmel <[log in to unmask]>
Date:
Mon, 27 Jun 2005 10:59:48 -0500
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Technetters,

I have received some microBGAs which I have to reball and they have a
no-clean flux residue which is difficult to remove.  Also, when it comes in
contact with our water-soluble flux it creates an acid which is not very
'friendly' to the part.

Would any of the chemical gurus care to edify one of the uneducated ones why
no-clean flux, when dried and allowed to set for a couple of months is so
difficult to completely remove and what possible acids or chemicals are
created when it is combined with water-soluble flux (type ORM1)?

As always, I appreciate the responses I receive.

David Tremmel
Technical Manager
BT Mexico

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