I used 35% quite a bit in a former job, it was a calibration fluid for the aforementioned packaging products. You'd sit there and watch the flow measurements changing as it circulated because it started breaking down. Finally worked with the major customers to do a substitute + adjusted output with water.
I've not worked with acids much other than weak stuff like glacial acetic. Nitric did come up every once in a while, but it was used more for passivating stainless flow tubes than as a process fluid.
I used 35% quite a bit in a former job, it was a calibration fluid for the aforementioned packaging products. You'd sit there and watch the flow measurements changing as it circulated because it started breaking down. Finally worked with the major customers to do a substitute + adjusted output with water.
I've not worked with acids much other than weak stuff like glacial acetic. Nitric did come up every once in a while, but it was used more for passivating stainless flow tubes than as a process fluid.
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