Andrew:
I have also tried Crystal Marks products for several
years. After the board clean, the fluid needs to be dump[d so that the
media does not build up in the cleaning fluid. You also have to worry
about the static charge. The media can generate thousands of volts when
it strikes the surface. The voltage sometimes spiked up and zapped some
sensitive components. I built a close loop humidity control and an ion
shower over the board to minimize the ESD damage. The Swan Blaster
removes the coating well but it is too slow to do a whole board. I am
partial to chemical CC removal for whole boards. For small areas I
would rather use a wide, sharp iron tip. It works very fast and the
curled up CC can be thrown into a regular waste basket. This can be done
on boards that have solder mask outer layer protection..
Ramon
_____
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, December 19, 2005 11:43 AM
To: [log in to unmask]; Dehoyos, Ramon
Subject: Re: [TN] senior chemist at HumiSeal
Ramon,
I have tried the 'bead blasting' method and I am very impressed with the
results. On my application, I still had some issues with removal of the
blasting media. Wash could not get all the beads out from under BGA's.
I have another source that uses Sodium BiCarbonate as the media. Claims
that it water soluable. Company is Crystal Mark in California.
Andrew Kettlewell
Sr Process Engineer
Sypris Electronics
Tampa, Fl
-----Original Message-----
From: Dehoyos, Ramon <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, 16 Dec 2005 08:32:27 -0500
Subject: Re: [TN] senior chemist at HumiSeal
Hi Joseph:
For small areas the best Cutting Media in the market is
CCR1000/2000 from CCRCo, recyclable, @ 800.443.2726. Very low static
generator ( under 50V ). I would not use any cutting media for the whole
board. It would take way too long. It seems that your board coating is
too thick or the chemical stripper is too old.
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask] <mailto:TechNet%40ipc.org> ] On
Behalf Of Joseph H. Smith
Sent: Wednesday, December 14, 2005 12:59 PM
To: [log in to unmask] <mailto:TechNet%40IPC.ORG>
Subject: Re: [TN] senior chemist at HumiSeal
We use Humiseal 1A33 coating. Whe have used Humiseal 1063 stripper but
without much accomplished. Will take 8- 10 hours before anything
happens. This is just unacceptable. Other products have left residue
under BGA's or have been corrosive enough to pit solder joints or remove
component markings. Some semipastes or gel like products have left
residue under leads and so on and so on. So you see that is why I have
asked the question. Actually, bead blasting was a mechanically
technique that sound promising. Removed the coating quite fast but left
blasting media under some components that I could not wash out.
Andrew Kettlewell
-----Original Message-----
From: Edward Mines <[log in to unmask] <mailto:edwmines%40yahoo.com> >
To: [log in to unmask] <mailto:agkettle%40NETSCAPE.NET>
Sent: Wed, 14 Dec 2005 07:22:02 -0800 (PST)
Subject: senior chemist at HumiSeal
I was the senior chemist at HumiSeal for 12 years.
Different polyurethane conformal coatings require different strippers.
Do you know which one you was used? Is it yellow?
Be careful which stripper you use. Some of them can attack components.
Edward Mines BEChE, MEChE
238 Willard Dr.
Hewlett, NY 11557
516 205-6523
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