Aimee Ehrman on sat 11 may 02
i have been commissioned to make large tiles for the outside of someone's
house and the house is right on the beach- does anyone know if the salt
water of the ocean would affect the glazes on the tiles - or if it would be
normal residue - so far what i have found is that other than normal ware
and tear it would be fine- and any glaze that is high in manganese might
be affected -- thanks
aimee
Janet Kaiser on sun 12 may 02
Yes. Salt is definitely a killer! If salt gets into the body, it will
first pop off the glaze and then start to decompose the clay. If you
want photographic evidence, mail me off list.
Here on the coast of Wales, we get one hundredweight of salt fallout
per acre per year. We also have high rainfall, which dissolves salt
residue and makes a strong saline solution. Much stronger and saltier
than normal sea water. Tiles have to be impervious either through a
stable glaze or through vitrified body or preferably both. Any ocean
site will get salt straight off the sea... Just look at windows after
a windy day. They are white. That is salt.
Watch for hairline cracks in your tiles too. The salt will eat away
both glaze and clay from the crack outwards.
Janet Kaiser
The Chapel of Art / Capel Celfyddyd
Home of The International Potters' Path
8 Marine Crescent : Criccieth : GB-Wales
URL: http://www.the-coa.org.uk
postbox@the-coa.org.uk
----- Original Message -----
> i have been commissioned to make large tiles for the outside of
someone's
> house and the house is right on the beach- does anyone know if the
salt
> water of the ocean would affect the glazes on the tiles - or if it
would be
> normal residue - so far what i have found is that other than normal
ware
> and tear it would be fine- and any glaze that is high in manganese
might
> be affected -- thanks
John Hesselberth on mon 13 may 02
Hi aimee,
You really should take a short course on how to make stable glazes before
you undertake this project. Depending exactly where those tiles are, it is
not just salt--think about sea gulls too--and probably a few other things.
The shortest of the short courses follows: 1) Make sure your glazes have
plenty of silica--preferably >3.0; 2) Make sure they have plenty of
alumina-- >0.25; 3) makes sure they are THOROUGHLY melted during firing; and
4) don't overload them with colorants.
Much more detailed info is available in Ron Roy's and my new book, Mastering
Cone 6 Glazes.
Regards,
John
on 5/11/02 4:09 PM, Aimee Ehrman at aimee_ehrman@HOTMAIL.COM wrote:
> i have been commissioned to make large tiles for the outside of someone's
> house and the house is right on the beach- does anyone know if the salt
> water of the ocean would affect the glazes on the tiles - or if it would
be
> normal residue - so far what i have found is that other than normal ware
> and tear it would be fine- and any glaze that is high in manganese might
> be affected -- thanks
>
>
> aimee
>
Web sites: http://www.masteringglazes.com and http://www.frogpondpottery.com
Email: john@frogpondpottery.com
"The life so short, the craft so long to learn." Chaucer's translation of
Hippocrates, 5th cent. B.C.
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