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February 1998

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Subject:
From:
George Toman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 19 Feb 1998 17:11:31 -0500
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Mr. Mullet,

Type B is photoimageable (dry film [B2] or LPI[B1]), while type A is screened.

George Toman
Circuit Center Inc.
----------
> Dear TechNetters,
>
> We have been specifying, on our Fab Drawings, the use of "Type B"
> soldermask.  I am under the assumption that this "Type B" is LPI, and "Type
> A" is screened soldermask.  Is this correct? Where can I find these "types"
> defined.  As far as I know there's nothing defined in IPC-SM-840C.
>
> Thanks for you help.
>
> Mr. LaVern Mullet
> Thomas & Betts
>
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