johankj
New Member
Hi all.
I'm thinking of using NaOH as a developer for my presensitized PCBs. The PCBs are coated with type FR-4 positive resist. (Don't know what FR-4 means)
What I've got is pure crystallized NaOH, but to which ratio do I dissolve it to?
From the wholesales website (ELFA), the developer they sell (Expensive!) is said to contain NaOH, but doesn't mention if it contains anything else. Their water to developer ratio is 20g to 2ltr water. That's 1:100 grams NaOH to mil-liters water.
Any suggestions, or experience with NaOH? What would be a good water temperature? And the water to developer ratio?
I think I've seen acetone being mentioned as a developer too. Has anyone done this? I've also read about people putting all sorts of fancy chemicals into the developer, are they really necessary and what do they do?
Sorry for always posting such long-winded questions The NaOH:H2O ratio is what I really want to know, the rest i curiosity.
I'm thinking of using NaOH as a developer for my presensitized PCBs. The PCBs are coated with type FR-4 positive resist. (Don't know what FR-4 means)
What I've got is pure crystallized NaOH, but to which ratio do I dissolve it to?
From the wholesales website (ELFA), the developer they sell (Expensive!) is said to contain NaOH, but doesn't mention if it contains anything else. Their water to developer ratio is 20g to 2ltr water. That's 1:100 grams NaOH to mil-liters water.
Any suggestions, or experience with NaOH? What would be a good water temperature? And the water to developer ratio?
I think I've seen acetone being mentioned as a developer too. Has anyone done this? I've also read about people putting all sorts of fancy chemicals into the developer, are they really necessary and what do they do?
Sorry for always posting such long-winded questions The NaOH:H2O ratio is what I really want to know, the rest i curiosity.