gbulmer
Moderator
siy - Thank you very much for those links and tips.
I'll pass on a link to your post to my friend, and we'll see if we can try some experiments.
I've never seen the Density Toner before.
We have been using 'proper' laser printable masking film, which is translucent rather than transparent, and with the 'hatched polgon' approach has given extremely even dense black. It is about $1/sheet, so we haven't done as many experiments as we might like :-)
gbulmer
Moderator
siy - I have chatted to people who make PCBs industrially.
AFAIK, when they use chemical tin as an etch resist, they later strip that off and re-tin because etching the chemical tin surface (when removing the unwanted copper) also reduces the tins suitability for soldering. Is that what you are finding?
siy
Member
I've not yet tried to solder PCBs made with metal resist. As I've mentioned, I've done only few first experiments with it. If my experiments will be successful I'll describe complete process. By the way, those people didn't mention which chemicals are used to strip tin after etching? First experiments show that tin surface looks not very good and I'm not surprised that it might not be suitable for soldering. Also, can you provide more details about 'proper' masking film?
gbulmer
Moderator
siy - I can't remember the exact part number, but we use these LaserStar films:
http://www.megauk.com/artwork_films.php
It was a couple of years since I talked to the professional PCB folks. I can not remember what was used to strip the tin, sorry.
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