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Subject: Re: [Homebrew_PCBs] MG Chemicals negative dry film resist report

From: Philip Pemberton <ygroups@...>
Date: 2009-05-26

DJ Delorie wrote:
> Exposure: 4 minutes in my exposure box (99x 395nm UV LEDs @20mA) holds
> at 6 on an ST21 gauge. This is less than the Riston film, so will

Would I be right in thinking that the ST21 is the step gauge you mentioned in
an earlier posting? Who makes them?

I've tried a quick Google search, but didn't find anything remotely useful...

Thanks,
--
Phil.
ygroups@...
http://www.philpem.me.uk/