Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: Alternative photoresist chemicals - Idea?
From: "designer_craig" <cs6061@...>
Date: 2012-04-17
Baxter,
From your description it sounds like this is a negative acting resist in that the exposed parts cross linked and became insoluable. It makes sense but I am a little confused at the moment because the Shipley AZ111 was a positive resist and used similar chemicals.
I did some more reading today and found this entire area is not unique to PCB making. There is an entire group of DIY folks trying to do the same thing for producint 4 color gelatin/dye photo prints. They have been looking into photo chemicals that are safer than the chromates. Also I found that the old Shipley AZ111 is still available but the company is now AZ Electronic Materials and the AZ111 has been reformulated with safer solvents to AS111XFS. Haven't found a small quantity distributor yet or any pricing.
I would like to know what is in the Genesis AQ3000 neative acting water based stuff I have, it may be PVA based. Nope I just found the MSDS it is based on Acrylic Polymers and Multifunctional Acrylates and water.
At one time they had quarts on ebay. www.genesismt.com
Wish they had this stuff in 8oz bottles.
Craig