Ed,

I do not believe there is an industry standard for this.  Web
thickness depends on glass style, resin content and most
importantly what the customer is happy with.  If our customers do
not give us there spec, we also use 15mil, but we have customers
who spec as low as 10 and as high as 18.

You can find some good information on scoring at

http://www.accuscore.com/faqs.htm

Regards

John Parsons
Circuit Graphics Ltd.
> Hi all my fellow technetters,
>
> I need some help. I have been referencing a standard web thickness of .015
> +/- .003 for a typical scored .062 thick array. Now, I ( for some reason )
> thought this was called out in some IPC spec. However, when recently asked
> where I got that requirement I could not find it...anywhere. I checked the
> D-350, D-275, A-600, 6012, and even the RB-276 and could not locate this
> as a referenced web thickness. So...l am rapidly concluding that I have
> fallen into the preverbal " I Think it because thats the way I have always
> thought it" syndrome. In other words, someone must have told me that was
> the IPC spec years ago and it stuck! I obviously did not actually check it
> out myself. Now, I have seen a lot of prints with that same requirements
> come in from many different customers. So... somewhere out there this
> requirement must be published in some form.
>
> Anyone know where I can find score depth requirements as an industry
> standard?
>
> Thanks,
>
> Ed Cosper
>

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