Joseph Herbert on thu 21 jan 99
The Decahydrate thing just means ten water molecules per borate group. The
chemical form given for borax in the CRC Handbook is: Na2O 2B2O3 10H2O (also
given as: Na2B4O7 10H2O) with a molecular weight of 381.43.
The water represents 180 of the total, or nearly half. If you were to use an
anhydrous (no water) version of this material, you would have nearly twice as
much sodium and boron as you intended. If you have some originally anhydrous
borax that is slowly gaining water from the atmosphere, you will have no idea
how much sodium and boron you are adding per weighed amount. Somewhere
between 1/200 gram atomic weight and 1/381 gram atomic weight per gram of
material added to the glaze mix. A large range.
Joseph Herbert
Joseph.Herbert@att.net
Ray Found on fri 4 may 01
I just made a batch of soldner's lava red raku, it has 50% borax and, whi=
le i
knew it was going to crystalize, i had no idea it would turn to concrete =
in
the bucket. Anyways, i was wondering if there is a way too keep the next
batch of Borax glaze to stay suspended. (im dealing with this batch and i=
ts
not getting thrown out, im juts wondering about the next one) Love the Li=
st,
keep it going.
Ray Found
Ababi on fri 4 may 01
My good personal adviser told me I should add to this kind of glaze 1or 2=
%
Calgon. I heard it last week, did not try yet
Ababi Sharon
ababisha@shoval.ardom.co.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
----- Original Message -----
From: "Ray Found"
To:
Sent: Friday, May 04, 2001 6:41 AM
Subject: Borax
> I just made a batch of soldner's lava red raku, it has 50% borax and,
while i
> knew it was going to crystalize, i had no idea it would turn to concret=
e
in
> the bucket. Anyways, i was wondering if there is a way too keep the nex=
t
> batch of Borax glaze to stay suspended. (im dealing with this batch and
its
> not getting thrown out, im juts wondering about the next one) Love the
List,
> keep it going.
>
> Ray Found
>
>
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Martin Howard on sat 5 may 01
Add up to 20 percent dried cat litter, Montmorrilonite or fuller's earth.
If you WANT to pay more, then use 5-10 percent Bentonite.
The glaze will stay usable then, but will still need a stir.
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
http://www.webbscottage.co.uk
iandol on sun 6 may 01
Dear Martin
You suggest as a cure for recrystalisation of raw borax percent dried cat litter, Montmorrilonite or fuller's earth. If you WANT =
to pay more, then use 5-10 percent Bentonite. The glaze will stay usable =
then, but will still need a stir.>
Now is this by volume or weight? And what will it do to the quality of =
the glaze to push that amount of clay into a mixture? Seems a curious =
cure to me.
Best regards,
Ivor
Josie Norman on wed 29 oct 03
Can someone enlighten me on the difference between anhydrous borax and borax ? Is there a difference or just different names for the same thing? Thanks for the help.
Josie in The Village of the Arts in Bradenton, Florida
Josie Norman
crackedpot933@earthlink.net
Why Wait? Move to EarthLink.
Logan Oplinger on thu 30 oct 03
On Wed, 29 Oct 2003 20:38:26 -0500, Josie Norman
wrote:
>Can someone enlighten me on the difference between anhydrous borax and
borax ? Is there a difference or just different names for the same thing?
Thanks for the help.
Josie,
Borax = Na2B4O7-10H2O, or hydrated sodium borate. Also called sodium
borate decahydrate. The 10 molecules of water are incorporated as part of
the crystal structure.
Anhydrous borax has had all of the water removed by heating it (see below).
Some suppliers of the anhydrous form may also use the common term 'borax',
so it can be the same name for the different things. See:
http://www.minerals.net/mineral/borates/borax/borax.htm#Picture
When using 'borax' or 'sodium borate' to make glazes it is important to
know if it is the hydrated or anhydrous form.
The hydrated form has a molecular weight of 381.43. The anhydrous form has
a molecular weight of 381.43-180 or 201.43. You would need almost twice as
much of the hydrated form to get the same effect as the anhydrous form.
A quick test would be to heat some with a propane torch. Lots of bubbling
would indicate the presence of water.
It should also be noted that there are different forms of hydrated sodium
borate. One has only 5 molecules of water (tincalconite), and one has 10
(borax). See:
http://www.borax.com/
For instructions on making the anhydrous for from the hydrated form see:
http://www.anvilfire.com/21centbs/material/borax01.htm
I hope this helps.
Logan Oplinger
Another Pacific Island
Josie Norman on fri 31 oct 03
Thanks to everyone for the help with question on borax. Logan the web sites were a great help, thanks. Josie in the Village of the Arts in Bradenton, Florida It's a great day in the neighborhood.
Josie Norman
crackedpot933@earthlink.net
Why Wait? Move to EarthLink.
Mike Gordon on sat 8 jan 05
Hi all,
I cleaning and organizing my studio. I found 2 - 10lb bags of Borax
that are hard as a rock, I want to transfer them to plastic containers,
is the chemical ok to just break up or do I need to do something
different, before I do the transfer. Thanks Mike Gordon
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