Spray-on postive resist (Positiv 20) in US? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd November 2006, 11:13 PM   #1
gmikol is offline gmikol  United States
diyAudio Member
 
Join Date: Oct 2005
Location: Vancouver, WA
Default Spray-on postive resist (Positiv 20) in US?

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
  Reply With Quote
Old 6th November 2006, 12:10 AM   #2
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
"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.
  Reply With Quote
Old 6th November 2006, 12:41 AM   #3
blmn is offline blmn  Brazil
diyAudio Member
 
blmn's Avatar
 
Join Date: Feb 2001
Location: .
hello,

Try www.farnell.com

regards
  Reply With Quote
Old 10th November 2006, 03:25 AM   #4
gmikol is offline gmikol  United States
diyAudio Member
 
Join Date: Oct 2005
Location: Vancouver, WA
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
  Reply With Quote
Old 10th November 2006, 05:05 AM   #5
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
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/vie...bbb176eabdbab2

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.
  Reply With Quote
Old 10th November 2006, 11:53 AM   #6
blmn is offline blmn  Brazil
diyAudio Member
 
blmn's Avatar
 
Join Date: Feb 2001
Location: .
Quote:
Originally posted by gmikol
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

I think they have it again. See at http://export.farnell.com/jsp/search...questid=136846

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

Best regards
  Reply With Quote
Old 10th November 2006, 12:34 PM   #7
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
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.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Decoupling Cap across the postive and negative pins mudihan Chip Amps 6 17th April 2009 01:50 PM
Which terminal is postive ? Jan Dupont Multi-Way 23 14th March 2007 09:35 PM
Some photoetching questions - positiv 20 Nordic Parts 18 18th September 2006 07:04 PM
Etch Resist Stripping richie00boy Parts 13 29th August 2005 09:05 PM
Couldn't resist this is too funny corryn00 The Lounge 0 31st January 2005 05:16 AM


New To Site? Need Help?

All times are GMT. The time now is 09:09 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2