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Subject:	Re: senior chemist at HumiSeal
From:	"Joseph H. Smith" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:	Wed, 14 Dec 2005 12:59:10 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (43 lines)

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]>
To: [log in to unmask]
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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