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| From [log in to unmask] Tue Feb 20 16: |
39:38 1996 |
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Randy
B-24 is a single sided specimen with 4 SIR comb patterns of 16mil lines
and 20 mil spaces. This was developed for the CFC alternatives, Phase 3
program looking at flux based alternatives.
B-25 is double sided with 6 comb patterns (3 on each side) that have
25/25, 12.5/12.5 and 6.5/6 lines and spaces. In addition B-25 has a number of
other patterns that were originally used in MIL-P-55110C qualification
For your information as part of the IPC-SM-840C (Solder Mask)
specification revision, we developed IPC-B-25A which is now available.
This pattern is a single sided board with 2 B-24 combs, with 1 B-25
(12.5/12.5) comb, 1 military "Y" pattern, and patterns for solder mask
tenting and a checkerboard pattern for adhesion testing.
Hope this helps.
Regards
__________________________________________________
David W. Bergman, Technical Director
IPC
2215 Sanders Road
Northbrook, IL 60062-6135
847-509-9700 x340 Phone
847-509-9798 Fax
email [log in to unmask]
www http://www.ipc.org
---------------------------------------------------
On Mon, 19 Feb 1996 [log in to unmask] wrote:
> What is the difference between the B-24 and the B-25 coupons?
>
> Randy Reed
> Merix Corporation
> [log in to unmask]
> 503.359.9300 X4421
>
>
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