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Old 25-05-2004, 08:06 PM
Khaimraj Seepersad
 
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Default [IBC] Fw: [IBC] Ceramic Pots

Good Day to all,

not to spoil the fun,but Vitrification in Stoneware is
supposed to mean 3 to 5 % porous?[as far as I
can remember.]

Inducing too much of the glass state is supposed
to weaken the object with regards to thermal
shock,isn't it ?

Has pottery science changed?

When in doubt about a piece of pottery a visit to
a potter or at least to ClayArt[on-line list] does
a world of good.
Stay Well all.
Khaimraj
Wet,Wet,West Indian Island Inhabitant.

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Old 25-05-2004, 09:03 PM
dalecochoy
 
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Default [IBC] Fw: [IBC] Ceramic Pots

I was kind of expecting a similar response...

----- Original Message -----
From: "Khaimraj Seepersad"
Subject: [IBC] Fw: [IBC] Ceramic Pots


Good Day to all,

not to spoil the fun,but Vitrification in Stoneware is
supposed to mean 3 to 5 % porous?[as far as I
can remember.]


Ahhh, most all of the stoneware clays I use are indeed about 2.5% , as I
recall, when fired to maturity. Do you figure they are doing a lot of
"breathing" at 2.5% porosity? ?
Have you EVER had moisture seep through your stoneware clays ( at 3-5%) as
with terra cotta or earthenware ( sometimes) and leave a crust of dried
water minerals on the outside? Now THAT'S "breathing" ! That's a "One
Season" pot in Ohio! :)


Inducing too much of the glass state is supposed
to weaken the object with regards to thermal
shock,isn't it ?

Has pottery science changed?


Thermal shock....is that important once the pot is finished fired? I don't
quite understand the comment in reference to a finished bonsai pot. Thermal
shock is a problem to consider when firing, not after it's in use.

What about porcelain??

Regards,
Dale

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Old 25-05-2004, 09:03 PM
Khaimraj Seepersad
 
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Default [IBC] Fw: [IBC] Ceramic Pots

Evening All,
Dale,

I simply gave you the limits as defined by Pottery
Science,since I have noted that once these statements
pass across the IBC,they will be treated as fact.

Freeze/Thaw is thermal shock.

Check your body mixes for Stoneware and Porcelain,
you will find the answer there.

The answers become relevant when you spend $$ for
a pot and it breaks when you don't look after it.

To much glass in the body and what happens when you
knock it,does it shatter like a bottle or chip like a flower
pot?

I would say if you guys give such precise information on
trees or fertiliser or insecticides,the pots should be afforded
the same.
Stay Well.
Khaimraj
You know where.

************************************************** ******************************
++++Sponsored, in part, by John Quinn++++
************************************************** ******************************
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Old 26-05-2004, 03:09 AM
dalecochoy
 
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Default [IBC] Fw: [IBC] Ceramic Pots

----- Original Message -----
From: "Khaimraj Seepersad" Subject: [IBC] Fw: [IBC] Ceramic Pots


Dale,
I simply gave you the limits as defined by Pottery
Science,since I have noted that once these statements
pass across the IBC,they will be treated as fact.

Freeze/Thaw is thermal shock.


No, thermal shock is the shock your clay gets when heated to fast in the
kiln ( can shatter) and a similar thing happens when cooled to quickly as in
the methods of making Raku. Clays are specially designed for these types of
shock. This doesn't really have anything to do with vitrified clay ( or
should I say "Not vitrified" clay) absorbing water and shattering when it
freezes ( as was, I believe, the concern of the original poster?)

Check your body mixes for Stoneware and Porcelain,
you will find the answer there.


uh...OK.


The answers become relevant when you spend $$ for
a pot and it breaks when you don't look after it.

To much glass in the body and what happens when you
knock it,does it shatter like a bottle or chip like a flower
pot?


Well, not quit sure how to answer. I've never seen a bonsai pot "shatter
like a bottle" from too much "Glass) in the clay? and they all pretty much
chip if "whacked" but high fired stoneware is more durable to chipping than
a "flower pot"


I would say if you guys give such precise information on
trees or fertiliser or insecticides,the pots should be afforded
the same.


uh...OK...again
Dale

************************************************** ******************************
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************************************************** ******************************
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