Ketan
Thanks for your message. Just because you are running no-clean does NOT
automatically mean that you must clean if you are coating.
However, why are you now going to be coating? Is your existing process not
reliable, so coating is being chosen to "fix" your problem? If so - this is
NOT a good idea.
If anyone out there suggests they have a coating that will OK to apply over
your no-clean processed assemblies, do NOT believe them. The only practical
way of establishing whether your product will be reliable is to run SIR
testing on representative coupons. You might want to try Ion Chromatography,
but this will only inform you of what is present, it will not tell you if
the end product will be reliable - unless you have Brian Ellis analyse the
results?
You should take a read of the IPC-CC-830 and JSTD-001 documents before you
do anything else. You really will have to run some tests - unless the risk
is worthwhile?
Take a look at my web site for more info - www.concoat.co.uk
Regards
Graham Naisbitt
[log in to unmask]
Web: www.concoat.co.uk
Concoat Ltd
Alasan House, Albany Park
CAMBERLEY GU16 7PH
Tel: +44 (0) 1276 691100
Fax: +44 (0) 1276 691227
-----Original Message-----
From: Ketan Bhatt [mailto:[log in to unmask]]
Sent: Monday, December 18, 2000 12:06
To: 'Graham Naisbitt'; 'TechNet'
Subject: RE: Conformal Coating...
I have a typical requirement.
We normally use no clean paste and fluxes, but have to go for cleaning
because we want to do conformal coating.
Can any one please recommend me about any coating material which can be done
directly w/o cleaning ?
Best regards,,
Ketan Bhatt
-----Original Message-----
From: Graham Naisbitt [SMTP:[log in to unmask]]
Sent: Sunday, December 17, 2000 6:07 AM
Subject: Re: Conformal Coating...
Ken
Contrary to Brian's comments, Coating can SAVE your business
Save: Because you will have fewer field failures
Save: Because field failure could very well put you out of business
Save: Because if you design for coating, the cost is minimal v the benefit
Save: Because you may be compelled, by law, to coat - now why do you suppose
that is a mandate?
Save lives! - Circuits that are safety critical such as ABS, Air Bag or
Avionics systems, or weapons systems - where did my nuclear missile go? How
about utilities such as gas, electricity and water meters that often have to
survive for 20 years - GUARANTEED!
I might also point out - and others will correct me if I am wrong but - an
automobile could be guaranteed for more than 10 years if only the
electronics systems would last that long.
Come on Brian - your comments are not entirely fair. It is true to say,
no-one wants to coat but it need not be such a painful experience - what
price safety? Is $0.05 per assembly a high price to pay? - Play-station, TV,
Mobile phone, Computer OK, don't coat, after all, they would prefer you to
replace the unit.
I hope this helps you Ken but if you would like more, let me know
Regards
Graham Naisbitt
[log in to unmask]
Web: www.concoat.co.uk
Concoat Ltd
Alasan House, Albany Park
CAMBERLEY GU16 7PH
Tel: +44 (0) 1276 691100
Fax: +44 (0) 1276 691227
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ken Patel
Sent: Saturday, December 16, 2000 01:29
To: [log in to unmask]
Subject: [TN] Conformal Coating...
Guys,
What are the pros and cons of Conformal Coating on PWAs? Who are vendors in
San Jose Bay area?
re,
ken patel
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