Nancy Udell on sun 20 jul 08
Wow, thanks as always to everyone for this wealth of great info. I
am going to study and try and few things. Will report back. Thanks
again.
Nancy Udell
Santa Fe, New Mexico
505.984.9907
www.clayandcolor.net
bobbruch1@AOL.COM on sun 20 jul 08
Date: Sat, 19 Jul 2008 12:25:33 +0000
From: James F
Subject: Re: Problems with slip casting
I would recommend the liquid sodium silicate.
You may have to adjust the amount that you use=C2=A0
depending on the mineral content of the water
that you are using.
Bob Bruch
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<<<odium=3D
silicate. I went round and round with the technical support people at the=
=3D
manufacturer=3D2C and STILL could not get a straight answer.
<<<a =3D
liquid. The dry powder could=3D2C of course=3D2C be weighed out accurately.=
H=3D
owever=3D2C the dry powder has a very short shelf life=3D2C and converts to=20=
sod=3D
a ash and silicic acid from contact with air (CO2=3D2C I believe)=3D2C so no=
lo=3D
nger functions in quite the same way. The liquid form is stable=3D2C but is=
=3D
only a 34% solution. It seemed to me=3D2C therefore=3D2C that one would hav=
e t=3D
o weigh out nearly three times as much liquid (X / .34) to obtain the requi=
=3D
site amount of actual sodium silicate called for. This is the issue upon w=
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hich I could get no straight answer from the manufacturer nor my supplier.
Ultimately=3D2C I still do not know if I am correct in that one must use X /=
=3D
.34 of liquid to equal X dry powder. Any science-types have ideas?
...James
Ivor and Olive Lewis on mon 21 jul 08
Dear Nancy Udell,
Looking at the numbers you gave and comparing them with other values
from several sources I have calculated that you need to reduce the
volume of water you are using by about a quarter This would mean about
30 parts instead of 42.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
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