Volume 30 H2O2 is a hair under 9% H2O2.
I see no real added value to using etching solution high in H2O2. If it's used one shot, the extra H2O2 is wasted. If the solution is stored and reused only occasionally, the extra H2O2 will tend to break down between uses. So, again, it's wasted. And I bet it costs far more than 3 times the cost of 3% H2O2.
Jim H
Received from Dave at 3/24/2019 02:19 AM UTC:
toggle quoted message
Show quoted text
Mark,
Yes, I am aware of the issues although I haven't made any solution yet. I was more worried about my shop equipment getting rusted. And my lungs too. But I decided I would do my etching outside and just need to properly store the etchant until I need it again. I see other people use the sponge method too so I may have to give it a try but I have plans to build a tank. And like you, I am not planning on doing a lot of boards but maybe a bunch at a time. Time will tell. My initial research showed a lot of interest in the Volume 30 stuff so I had to get some. :)
Thanks
On 3/23/2019 1:33 PM, Mark Lerman wrote:
High concentrations of H2O2 result in VERY exothermic reactions. Etching takes place in seconds. Lots of heat. Lots of acrid fumes. Do outside or with a good hood. Have water available to put your board in to stop the etching. I did a lot with those high mixtures but decided it wasn't worth the problems and went back to 3% peroxide. I usually use a sponge with a small quantity of etchant. Takes a minute or two but is very controllable and uses only a fraction of the volume, making disposal much easier. I don't make a lot of boards, so it's not worth keeping vats of chemicals around.
Mark
