I am carrying out a study of sustainable technology opportunities for etch
resist stripping.  By this I mean that I am interested in finding out what
possible technologies are being used/investigated for recovering tin,
either as tin or tin oxide, from spent etch resist strippers.

If there is a way to recover the tin and reuse the acid there is the basis
of a sustainable approach.

I am assuming that most spent stripper is currently tankered away for waste
treatment and landfill.

Any figure on the scale of the resources used ie lost per year would be
useful.

The key challenge is finding a viable method for getting the colloidal tin
oxide, which forms in the stripper, out for recycling.

Is anyone out there doing anything in this area?

Is anyone still using tin-lead etch resists?

If anyone can help I would be pleased to hear from you.

Thanks, in advance,

Martin Goosey

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