Spray-on postive resist (Positiv 20) in US?

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gmikol

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Joined 2005
#1
Hi there--

I was wondering if anybody out there knew where I could get my hands on a can of this stuff from a US distributor? Or if there's another product in the US that is similar? I've been searching on the web, and it looks like everyone selling it is in Europe. CRC doesn't seem to have a part number for US packaging, even. I found one reference a few years old that said Radio Shack sold it, but I find no evidence of it on their website.

Thanks--

Greg
 
#2
"MG Chemicals" used to sell a positive photoresist spray in spray cans. I didn't get very good results with it: it was better to buy the liquid photoresist, thin it 50%, then spread it with a foam brush. As far as I can see on their website, they no longer sell either product, just pre-coated boards.

Injectorall has a liquid positive photoresist:
http://www.injectorall.com/photoresist.htm

Photoresists are also used in some graphic arts and printing processes, so you might get somewhere asking at a graphics supply dealer.
 
#4
Well, Farnell doesn't have anything in stock, and I'm really looking for a US distributor. Injectorall is a little pricey ($40 for 2 oz.)

I found a negative-acting resist from Datak, but the developer is some "special-sauce" instead of just a simple NaOH developer.

So I'm back to square one...any other suggestions?

--Greg
 
#5
At technical school we used "KPR" - Kodak Photo Resist, which is a negative photoresist.

Suppliers with prices for KPR, but in production quantities:
http://www.dalpro.net/Page.html
http://www.kepro.com/chemcoat.htm

EAGLE NT90 and 2005 developer - Rohm & Haas
were suggested as a replacement for KPR in this thread: http://www.prodigy-pro.com/forum/viewtopic.php?t=9107&view=next&sid=c99b9b1adae7dc6555bbb176eabdbab2

That thread also mentions Cronite, which has KPR (but by the quart), and something that looks more suitable (or at least affordable):

http://www.cronite.com/etchsup.htm
"EP1-225A Resist, Photo-Top, 8 ounces"
"Photo-Top Resist - A negative working liquid solvent developable resist (use positive film for getting an intaglio plate) which can be poured, whirled, or sprayed on. Packaged in small quantity for trial or infrequent users."

Try checking the ads in "Nuts And Volts" magazine for placese that sell prototyping supplies.
 
#6
gmikol said:
Well, Farnell doesn't have anything in stock, and I'm really looking for a US distributor. Injectorall is a little pricey ($40 for 2 oz.)

I found a negative-acting resist from Datak, but the developer is some "special-sauce" instead of just a simple NaOH developer.

So I'm back to square one...any other suggestions?

--Greg
Click to expand...


I think they have it again. See at http://export.farnell.com/jsp/searc...rch_001&Ntt=positiv+20&Ntx=&_requestid=136846

In stock and costs more or less 7 dollars plus taxes.

Best regards
 
#7
I never had good results with the self applied coatings, I'd stick with the precoated, here isn't that much price difference and once you factor in the cost of the coatings...

However, I personally have given up on the whole UV system, I bought myself a cheap HP Laserjet 4000 on eBay and now just use toner transfer. Once you get it down, it's so much quicker.
 
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