iandol on wed 10 jul 02
Dear Jorge Nabel,
You quote your guide as suggesting that when preparing Throwing Clay you =
should deflocculate the slurry. Well, test it out with a few pounds and =
see if you get a good strong throwing clay.
I think he is wrong to suggest that once the slurry is in paste form =
"the deflocculants are no more active as the ionic attraction is no =
longer working". Deflocculants work because they cause the clay =
particles to repel each other. Some clays will remain fluid with as =
little as 15% by weight of water but they become sticky pastes as water =
evaporates from them.
Another point at issue is the type of deflocculant being suggested. =
Those based on Sodium compounds add an extra body flux into the =
equation. This may have a major effect by lowering maturing temperature =
or shortening the firing range of a clay though I cannot recall reading =
that this would or does happen.
Plastic Clay is interesting stuff and it's true nature is largely =
misunderstood.
Best regards, and yes! we southern peoples are getting colder weather =
this year.
Ivor Lewis. Redhill, South Australia.
Earl Brunner on thu 11 jul 02
Jorge,
Learn to throw with less water.
--
Earl Brunner
http://coyote.accessnv.com/bruec
mailto:bruec@anv.net
| |
|
