[sdiy] tinning solution toxicity?

[David G. Dixon]

Dave,

Liquid Tin is a solution of 10% fluoboric acid, 10% stannous (divalent tin)
fluoborate, and 5% thiourea.  Fluoboric acid is not that harsh, as acids go
-- it's main claim to fame is that it's chemically inert -- and tin is
totally non-toxic (it's the active ingredient in toothpaste).  Prolonged
exposure to thiourea may cause liver tumors, but unless you're drinking the
stuff or taking baths in it, I don't think you have to worry.  Use the
normal precautions for handling any serious chemical (eye protection, rubber
gloves, reasonable ventilation; i.e., don't use it for several hours at a
time in a sealed broom closet) and you'll be right as rain!

Cheers,
Dave

David G. Dixon
Professor
Department of Materials Engineering
University of British Columbia
309-6350 Stores Road
Vancouver, B.C. V6T 1Z4
Canada
 
Tel 1-604-822-3679
Fax 1-604-822-3619
 
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> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> bounces at dropmix.xs4all.nl] On Behalf Of Dave Leith
> Sent: Monday, July 06, 2009 5:31 PM
> To: SDIY
> Subject: [sdiy] tinning solution toxicity?
> 
> Is anyone using a liquid tinning solution like the one made by MG
> chemicals?
> http://www.mgchemicals.com/products/421.html   Seems pretty potent but
> safe with caution?
> 
> I wondered about using this as I like to tin my Press and Peel circuit
> boards but doing by hand is a lot of work
> 
> Thanks dave
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