Well, I am in the tropics so I don't heat the etchant. Coldest is about 24 �C. I do etch on top of a bar fridge where I keep my solder paste and assorted acrylic glues & sealants. So it's probably a little warmer based on the condenser coil heat at the back of the fridge. Also, I use diluted nitric acid. One full gallon carboyle of the concentrated stuff lasts me about 10-15 years after dilution. Space has a bit of forced ventilation with a BLDC plastic 115CFM fan. The nitric fizzes/agitates on its own when etching and the copper clad rises and falls a couple times a minute if double sided as bubbles build on the bottom. I use a 1 litre rectangular plastic container (3" tall) with a lid usually about half full. Details on the whole process with pics and videos. https://hackaday.io/project/7938-pcb-smt-maker-lab-home Ancel
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Re: Heater for Etchant Bath
2016-10-09 by AncelB