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are there toxic vapours produced from using ferric chloride to etch pcb boards? Answered

are there toxic vapours produced from using ferric chloride to etch pcb boards?  I want to present this process in a classroom but there are no windows and wondered if this would be hazardous. There's also the method of mixing hydrochloric acid and hydrogen peroxide to act as an etchant. Thanks!

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rickharrisBest Answer (author)2012-03-22

I wouldn't drink it or get in on my hands but at room temperature no noxious fumes will appear. We used to process PCBs in the class room all the time - using a commercial bubble tank setup.

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steveastrouk (author)2012-03-22

The cupric chloride method DEFINITELY produces fumes. I think they contain Hcl, especially if you use a bubble tank.

I suspect FeCl may also emit Hcl as well, but I am not sure - certainly you have to neutralise spent FeCl, so it becomes acidified in use.

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iceng (author)steveastrouk2012-03-22

It leaves a black iron sludge with exchanging CuCl <== FeCl no smell at all

but ferric chloride stains cloths .

A

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