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Unread 07-29-2009, 03:17 PM   #3
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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I will readily admit knowing nothing at all about the clay industry that Ingeborg is familiar with, but let me clarify a bit from the ceramic tile industry side.

To be classified as Porcelain in our industry, a tile must be a ceramic tile, generally dust-pressed or extruded, which has a water absorption rate of 0.5% of its weight or less.

That's it. Excludes other impervious types, such as glass and metal, but if it's ceramic and has an absorption that low, it's porcelain. How you get it there is up to you as a manufacturer, but you generally gotta squeeze it harder and get it hotter, I'm told.

It can be glazed or unglazed, through-body colored or not, textured or not, look ugly or not, but if you make it outa clay and can get it dense enough to meet that absorption standard you can call it porcelain.

My opinion; worth price charged.
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