Shula on sun 6 jul 08
Hi,
This may sound totally off the wall, but here goes. I am thinking of making soap dishes and am wondering what I could use to test the glazes I may use for stability. That is, I don't want to create a soap dish and then have someone come back in the future because the soap ingredients have discolored or done something else to the glaze. Is there something I can use to speed up testing rather than using the glaze for my own soap dish at home?
Thanks
Shula
Desert Hot Springs, California USA
Ivor and Olive Lewis on mon 7 jul 08
Dear Shula,
The answer to your question <testing rather than using the glaze for my own soap dish at home?>>
depends on the nature of soap and why it might be corrosive towards a
fused alumino silicate.
To get an accelerated result might require you to boil samples in
Caustic Soda, which is extremely corrosive if it contacts your skin
and would cause severe burns. Something I would not attempt
Considering ceramic basins have been in contact with soap solutions
for years and their surfaces rarely seem to deteriorate I think you
are imagining a problem where there is none.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Ron Roy on sat 12 jul 08
Dear Ivor,
On the contrary - you can be sure the sink and bathtub makers are very sure
to test their glazes for resistance to alkali attack - and expansion of
course.
RR.
>Dear Shula,
>The answer to your question <>testing rather than using the glaze for my own soap dish at home?>>
>depends on the nature of soap and why it might be corrosive towards a
>fused alumino silicate.
>
>To get an accelerated result might require you to boil samples in
>Caustic Soda, which is extremely corrosive if it contacts your skin
>and would cause severe burns. Something I would not attempt
>
>Considering ceramic basins have been in contact with soap solutions
>for years and their surfaces rarely seem to deteriorate I think you
>are imagining a problem where there is none.
>
>Best regards,
>Ivor Lewis.
Ron Roy
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Ivor and Olive Lewis on sun 13 jul 08
Dear Ron Roy
Fair comment.
Perhaps you would like to describe the tests for resistance to alkali
corrosion.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Ron Roy on wed 16 jul 08
Hi Ivor,
See Ceramics Glaze Technology by J. R. Taylor and A. C. Bull - page 181.
Testing glazes using acid, soap, and washing machine agent.
For soap, A thermostatically controlled bath is necessary - Two sets of
examples used - one set immersed in a solution (1/2%) of soap flakes, free
from inhibitors, for 32 hours at 60C plus or minus 2C. The solution is
stirred continuously. Compare sample with other samples not tested.
Washing machine agent: A set is immersed in (0.5%) solution of washing
machine agent for a minimum of 32 hours at 76C plus or minus 2C.
These are the tests used by the British Ceramic Research Association.
They also outline the standard test for acid resistance - 5% acetic acid at
room temp. for 16 hours - immerse sample and compare with untested sample.
There is also a list of surface appearance to asses durability from 1 (no
affect) to #7 - no gloss left.
Hope you find this book Ivor - it is one of the best.
RR
>Dear Ron Roy
>Fair comment.
>Perhaps you would like to describe the tests for resistance to alkali
>corrosion.
>Best regards,
>Ivor Lewis.
>Redhill,
>South Australia.
Ron Roy
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Ivor and Olive Lewis on thu 17 jul 08
Dear Ron Roy,
Thank you for that information. I hope the person who was going to
make soap dishes reads it and follows through.
I have tried to get hold of Taylor and Bull but it is not in our State
Library System.
A lot of important books may be in Australia but they are in private
hands.
Stock came in today form the Chem Wholesale Supplier . I will be able
to test the relative strength of some potential flocculating agents
and compare them to the regular ones. I will include Urea as an
example.
Best regards,
Ivor
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