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Original Text
From: Aric Parr@01635@Lectron_RH, on 6/18/98 7:30 AM:
To:
EatonWHQ@CorpMail@WHQCleveOH[C=US/A=INTERNET/DDA=ID/rickt(a)appliedsynergy.c
om, internet[[log in to unmask]]]
Try a selective coating system. Start up cost is significantly higher,
material cost is lower, masking cost is lower.
Hand spraying provides little process control for coverage and thickness
relative to any automatic process.
100% reactive formulations should be used for EPA permitting reasons.
Thermal cure systems require oven bakes, where not all components can
handle the cure properties. Lower temperature cure relative to the
supplier's specifications can result in poor coating adhesion, no permanent
cure, poor performance....
RTV systems (moisture cure) work great and will always cure. They may also
cure inside the sytem if you don't design for it. Many do not require an
oven for rapid curing.
Avoid UV cure. Shadow cure mechanisms are not very robust. It is also very
sensitive to flux residues.
ARIC PARR
Sr. Manufacturing Engineer
Eaton Corp
1400 S. Livernois
P. O. Box 5020
Rochester Hills, Mi 48308-5020
[log in to unmask]
248 608 7780
Fax: 248 656 2242
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From: C=US/A=INTERNET/DDA=ID/rickt(a)appliedsynergy.com, on 6/17/98 11:23
PM:
To: Aric Parr@01635@Lectron_RH,
EatonWHQ@CorpMail@WHQCleveOH[C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG]
Hi Technetters,
A number of our customers are starting to request more conformal coating of
the PCBA's we assemble for them, and I have been given the task of
evaluating various materials and equipment for doing this in-house rather
than outsourcing it. Specifically, I looking for any help or pointers I
can
get on sources of equipment, specific types (SR, etc) I should consider,
environmental and health concerns and regulations, etc. Spraying appears
to
be our best application method at this point. Any comments on building a
spray booth vs. purchasing a unit from one of the vendors supplying these
would also be appreciated.
Thanks in advance for any tips you might provide.
Regards,
Rick Thompson
Ventura Electronics Assembly
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