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Old 3rd December 2005, 07:45 PM   #1
Stocker is offline Stocker  United States
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Question 254nm UV for etching?

I was just given an EPROM eraser which uses a 254nm lamp for the UV source... assuming the lamp is still good, is this wavelength suitable for PCB etching with the commonly available DIY chemistries?
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Old 6th December 2005, 09:21 PM   #2
Stocker is offline Stocker  United States
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Nobody?

this wavelength seems (on Google) to be mostly used for killing microscopic thingies and erasing EPROMS... but will it work for DIY PCB etching?
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Old 8th December 2005, 09:25 PM   #3
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My workmate has tried the eraser lamps, but found plain old sunlight worked better. 254nm is too short, and too dangerous. Permanent damage threshold for your eyes is about 8 minutes! Short UV at that wavelength kills bacteria by crosslinking its DNA : ie causing massive genetic damage.
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Old 9th December 2005, 12:01 AM   #4
Stocker is offline Stocker  United States
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Thanks for that. Maybe Ebay or a DIY water cleaner...
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Old 10th December 2005, 12:07 AM   #5
Devius is offline Devius  Portugal
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Positiv 20 works at 340-420 nm.
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Old 10th December 2005, 01:55 AM   #6
Stocker is offline Stocker  United States
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ah, ok thanks but the bulb is specified as 254, not 354nm.
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Old 10th December 2005, 02:11 AM   #7
Devius is offline Devius  Portugal
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ok... but that was my point. I just didn't concluded that in the post because it was obvious :P

I use a Philips TL20W/05, but that's just when there isn't enough sunlight because the sun gives me much better results than artificial lighting.
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