The standard is reasonable. Perhaps your supplier is attempting to
maintain the specified thickness across the board, which is not
required. The thickness is to be measured on a flat unencumbered portion
of the board or on a coupon processed with the board.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Colin Weber
> Sent: Tuesday, October 29, 2002 10:34 PM
> To: [log in to unmask]
> Subject: [TN] IPC-SM-840
>
>
> Hi Folks,
>
> Our company has specified; IPC-SM-840, CLASS T, 0.001-0.002"
> THICK. on each board we have had manufactured for the last few years.
>
> I just received notice from our current manufacturer that
> they cannot consistently meet this requirement for 1 to 2
> thou thickness, and want to produce a thickness at a minimum
> of 0.4 thou.
>
> My questions are;
> 1. Is this standard considered old and I should be looking at
> specifying something else? 2. Are there any repercussions in
> changing to the suggested reduced thickness?
>
>
>
>
> Regards,
>
> Colin Weber
>

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