Hi Ernie,
    I've had some success by using 2 mil film and dropping the exposure slightly.  By dropping
the exposure, you will gain more elasticity in the resist (Stay in spec on the stouffer
though!!!).  Other things would include: insure adequate overlap of the hole/slot edge (maybe
.010" or greater on a side).  Check the handling at the develop, plate, strip, and etch.  Follow
some lots through and locate the failure point.  Check your nozzle angles and pressures. check
the quality of the slot/holes (burrs, ragged edges, etch.)
If you want to call me,  My office number is 432-2188.  I can offer some other ideas too.

[log in to unmask] wrote:

>                   We seem to have an issue with tents breaking on large
>      holes ( .180 to .250 dia. ) as well as slots, typically .118 x .250.
>      No matter whose film we have tried, the tents break. It is not always
>      every panel, nor every lot. We have an idea that it may be being
>      caused by the developer. Has anyone out there wrestled with this
>      problem, and if so how was it resolved. To switch to secondary drill
>      would just impact that departments output Any help will be deeply
>      appreciated.
>
>                   Ernie Smith
>                   Electropac Co. Inc.
>
>      e-mail to   [log in to unmask]
>
>      or on the technet
>
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