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July 2003

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Subject:
From:
Barry Gallegos <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 18 Jul 2003 07:12:47 -0600
Content-Type:
text/plain
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text/plain (95 lines)
Now, Now Joyce.
One could imply by your response that you take offence.

BG

-----Original Message-----
From: joyce [mailto:[log in to unmask]]
Sent: Friday, July 18, 2003 6:05 AM
To: [log in to unmask]
Subject: Re: [TN] Exposed basis metal


I guess I should wait until the "dear sir" answer it officially.  Here
is my un-official answer based on my understanding:

Exposed copper on your roof will soon be green - corrosion
Exposed solder, tin/lead HASL pad just like your old old copper water
pipe used to solder together - much less corrosion
Exposed gold, silver (hopefully, not really pure, add some other stuff)
- much much less corrosion = that is why your wife want it as ring...(of
course, you can put a copper ring, a solder ring and a gold or silver
ring on someone's finger and wait for few years see what happened...
Same thing!)  I would be very upset if someone give me a copper ring as
a body pH tester.....

"Dear Sir" should give you better answer... For sure!

jk

>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of
>August Chang
>Sent: Friday, July 18, 2003 7:12 AM
>To: [log in to unmask]
>Subject: [TN] Exposed basis metal
>
>
>Dear Sir,
>
>We bought one copy of IPC-A-610C, January 2,000 supersedes
>rev:B, Dec .1994. I have got one simple question, but need
>your clarification to see if my understanding is correct?
>
>In section 6.5.2 Exposed basis metal, Figure 6-41 shows a not
>100% wetted pad on PCB land area, it only about 50% in my
>point of view.
>
>Does this mean that the exposed base metal in unsoldered areas
>should be considered normal as shown in the photo of Figure
>6-41, just because it is OPS coated PWB. If so, would you also
>tell me why?
>
>I would appreciate it if you could answer me ASAP.
>
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