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weight of fired porcelain


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#1 madi beattie

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Posted 25 April 2012 - 07:27 AM

How much would a 10kilo bag of porcelain weigh after it has been fired, would the fired weight be more or less than the wet clay?? Thanks :)

#2 OffCenter

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Posted 25 April 2012 - 08:11 AM

How much would a 10kilo bag of porcelain weigh after it has been fired, would the fired weight be more or less than the wet clay?? Thanks :)


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#3 Pres

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Posted 25 April 2012 - 08:21 AM

How much would a 10kilo bag of porcelain weigh after it has been fired, would the fired weight be more or less than the wet clay?? Thanks :)


When asking that question, consider the weight of water, and the existence of mechanical water and chemical water in the clay. After firing none of these waters are present.

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#4 Riorose

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Posted 25 April 2012 - 12:46 PM

If the manufacturer cannot tell you then test. cut off 100 grams. wait til bone dry and calculate physical water loss FYI. then high fire the piece, weigh on a gram scale. then use your pre algebra skills to exyrapolate to the full 10 kilos. while you are at it form the 100 grams into a tile and carefully mark off 10centimeters. the shrinkage % CAN THEN BE ESTIMATED AS WELL.

#5 neilestrick

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Posted 25 April 2012 - 12:51 PM

You'll also burn out any carbon-based materials present in the clay. Don't forget this stuff all comes out of the ground, so there's millions of years of decomposed plants and lizards in there, too....

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#6 Diana Ferreira

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Posted 25 April 2012 - 01:15 PM

You'll also burn out any carbon-based materials present in the clay. Don't forget this stuff all comes out of the ground, so there's millions of years of decomposed plants and lizards in there, too....


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#7 bciskepottery

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Posted 25 April 2012 - 09:55 PM

I recall someone telling me that some of the ancient Chinese potters, when preparing porcelain for the next generation, would urinate on the clay to improve plasticity before covering the pit.

#8 Pres

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Posted 25 April 2012 - 10:05 PM

I recall someone telling me that some of the ancient Chinese potters, when preparing porcelain for the next generation, would urinate on the clay to improve plasticity before covering the pit.


This technique was not only used in Asia, throughout Africa, and other countries.

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#9 Matt Oz

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Posted 26 April 2012 - 07:55 AM

You'll also burn out any carbon-based materials present in the clay. Don't forget this stuff all comes out of the ground, so there's millions of years of decomposed plants and lizards in there, too....


I know for a fact, that there is some T. rex in my clay.

#10 timbo_heff

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Posted 26 April 2012 - 02:20 PM

It's about 30 % lighter fired v. moist pugged

#11 neilestrick

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Posted 26 April 2012 - 04:00 PM


You'll also burn out any carbon-based materials present in the clay. Don't forget this stuff all comes out of the ground, so there's millions of years of decomposed plants and lizards in there, too....


I know for a fact, that there is some T. rex in my clay.



T. Rex were not good throwers because of their tiny arms...

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#12 bciskepottery

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Posted 26 April 2012 - 04:24 PM

T. Rex were probably hand-builders . . . mostly earthenware, which led to their extinction. : )

#13 neilestrick

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Posted 26 April 2012 - 04:54 PM

T. Rex were probably hand-builders . . . mostly earthenware, which led to their extinction. : )


You are gonna catch so much crap for that.....Posted Image

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#14 Matt Oz

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Posted 26 April 2012 - 05:15 PM

The ceramic arts are indeed ancient

#15 macdoodle

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Posted 27 April 2012 - 05:53 PM


T. Rex were probably hand-builders . . . mostly earthenware, which led to their extinction. : )


You are gonna catch so much crap for that.....Posted Image


Yes, us old dinosaurs are watching...

#16 bciskepottery

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Posted 27 April 2012 - 06:25 PM



T. Rex were probably hand-builders . . . mostly earthenware, which led to their extinction. : )


You are gonna catch so much crap for that.....Posted Image


Yes, us old dinosaurs are watching...


Most days I feel as if I am one with T.Rex . . . not only is he/she in my clay, but I primarily hand-build.




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