Hi Ted and All -
Yes, you were a bit too general. IPC-2221 is a DESIGN STANDARD, whereas
IPC-4101 is the appropriate MATERIAL SPECIFICATION. The subsections of
IPC-4101 allow the designer to select, by slash number (ie., IPC-4101/**)
the specific material group desired. When the end item design criteria
permits I have given the board fabricator and either/or call out.
If you intend to allow the board fabricator some options, it is important
that these callouts also be coordinated with the assembler, so as not to
adversely affect his process set-up. One of the nightmares of
Manufacturing is to learn, after the fact, that the board they have been
assembling with ease for a long period of time, is suddenly made from a
different material which requires a different preheat setup, or is
intolerant of some of the chemistry of their processes.
Regards - Kelly
> [Original Message]
> From: Ted Tontis <[log in to unmask]>
> To: <[log in to unmask]>
> Date: 1/25/02 9:55:12 AM
> Subject: [DC] IPC-2221
>
> I just received a call from our board manufacture regarding
> IPC-2221. This is the note I added to the board in the drawings.
> 2. ALL MATERIAL SHALL BE IN ACCORDANCE WITH IPC-2221, PLASTIC SHEET TYPE
> BASE MATERIAL, GLASS BASED PREIMPREGNATED WOVEN E-GLASS WITH A Tg RATING
OF
> 150 DEG. C BASE MATERIAL SHALL MEET UL 94V-0
> I was told that I should have used IPC 4101, I am still new to the
> IPC standards and I thought that 2221 called for the board standards of
both
> fabrication and assembly. Was I too general, is IPC 4101 more specific in
> regards to the substraight material, or did I forget to add something to
my
> notes.
>
> Thank you,
>
> Ted Tontis C.I.D.
> Engage Networks
> 316 N. Milwaukee Street
> Suite 214
> Milwaukee WI, 53202
> PH 414-273-7600 ext. 7607
> FX 414-273-7601
>
>
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--- Kelly M. Schriver
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