[modeleng] Re: Tanalising

Tantalizing thought, that---breathing in all that
stuff!

Al Messer

--- Tony Wells <oaksfield@xxxxxxxxxxxxxxx> wrote:

> When I was at college, nearly 40 years ago, I went
> on a trip around the 
> factory where the process was first invented. The
> tanalsing process involves 
> pressure treating the wood with a variety of
> chemicals, including copper 
> sulphate, which used to be called Bordeux Mixture
> when gardeners were 
> allowed to use it as a fungicide, so it is obviously
> there in the tanalised 
> wood for the same purpose. You should be aware that
> it also includes some 
> other VERY nasty chemicals, including arsenic, and
> it is therefore 
> recommended by the RSPB that it is not used for such
> as bird tables or 
> nesting boxes, as these chemicals can leach out onto
> the surface, poisoning 
> the birds in the process.
> 
> It is also adviseable that you thoroughly wash your
> hands after handling any 
> of it as you do not know how long it has been stood,
> having the chemcials 
> leached out, before you buy it, and definitely do
> NOT turn any of it on a 
> lathe, as the resultant dust will not only be toxic,
> but will hang in the 
> air for several days afterwards, just waiting for
> you to breathe it in. MDF 
> dust is generally accepted as carcogenic, but is
> nothing compared to 
> tanalised dust!
> 
> Tony Wells.
> 
> 
> ----- Original Message ----- 
> From: "Roger Mason" <roger.g3tdm@xxxxxxxxxx>
> To: "Model Engineering List"
> <modeleng@xxxxxxxxxxxxx>
> Sent: Tuesday, July 25, 2006 9:19 AM
> Subject: [modeleng] Tanalising
> 
> 
> > Hi All,
> >
> >    I recently bought some tanalised wood.   I
> screwed and glued (PVA
> > glue) a couple of pieces together.   Of course
> some of the glue oozed
> > out of the join.   I scraped this up using a steel
> bladed scraper.   The
> > scraper became nicely copper plated!
> >
> >    The only time I have seen steel become copper
> plated like this is
> > when it comes into contact with copper sulphate.  
> Is that what
> > tanalising is - just soaking the wood in copper
> sulphate?
> >
> >    I am sure someone here on this list will know.
> >
> >    The wood was being used on the workshop - model
> engineering content!
> >
> >
> >       Cheers,
> >
> >
> >          Roger Mason,  in St. Agnes.
> >
> > MODEL ENGINEERING DISCUSSION LIST.
> >
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> > line.
> > 
> 
> 
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