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We are trying to determine the amount of cleaning necessary, if necessary,
prior to conformal coating with HumiSeal 1A20.
We currently use water soluable flux in our wave soldering machine. We clean
with water, no additivites, in a Trieber SMT type machine. Additional
components may be added, after cleaning, using a no clean flux core solder. A
residue is left on the boards with this type flux.
The question are:
1. Should secondary cleaning be accomplished prior to conformal
coating?
2. What should be used for the second cleaning? This is asked with
regards to using materials without CFC and/or requiring special
equipment?
3. How clean is clean for adhesion ot the conformal coating material,
HumiSeal 1A20 or 1A27.
Any input regarding the above questions will be appriciated.
Richard E. Ackerson
Sr. Industrial Engineer
Elsag Bailey Process Automation
Phone 216-585-7646
Fax 216-585-8867
Interne [log in to unmask]
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