The positive resists I am aware of are all 375 nm or greater. NB: incandescent lamps may put out to 350 nm. I use Injectorall, and it recommends something around 390'ish nm. ±20nm is not going to make much difference. Injectorall also allows exposure with ordinary incandescent lamps.
John
----- Original Message -----
From: Dave Sage
To: Homebrew_PCBs@yahoogroups.com
Sent: Saturday, February 25, 2012 10:16 AM
Subject: [Homebrew_PCBs] Re: Novel way to expose photo resist??
SO, can anyone quote the required wavelength of light required for some UV
photo resists? The MG Chemicals exposure light is 375nm. I think it will do
both their pre-coated positive resist boards and their negative dry film
resist. Of course positive pre-sensitized boards are of no use to the laser
plotting technique proposed.
Sage
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