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From [log in to unmask] Mon Mar 11 17: |
37:48 1996 |
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<"PK1Hd.0.q59.S3qFn"@ipc> |
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Regarding silicone coating rework:
First I assume that you are mechanically removing the coating in the
affected area and not burning through to repair. Sufficient material
must be removed to allow cleaning of the solder pad without
recontaminating the solvent by contact with coating remaining on the
board.
Cleaning solvents by effectiveness: 1. Toluene 2. xylene 3. benzene 4.
MEK.
Lightly moisten a swab with solvent and wipe the area once, in one
direction only. Do not allow solvent to puddle or contact surrounding
coating. Repeat this more times than you think necessary. Follow this
with a light IPA cleaning, using the above procedure. Don't reuse
anything.
Good luck!
______________________________ Reply Separator _________________________________
Subject: Rework after conformal coating
Author: [log in to unmask] at internet
Date: 3/5/96 4:27 PM
Anybody have any technical info/references/articles, etc.. on the
effect of solderability during a rework operation to a joint that was
previously conformally coated with a silicone-based coat. Specifically
what are some of the problems that may be encountered with residual
silicone and it's effect on solderability ?
DDrake
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