Clay vs Ceramic
No plans on letting H20 meet my old friend here. Thanks for the help, though. I just don't know what material this cooker is made of and what I can do with it. If it is clay vs ceramic.
Not sure you mean by clay vs ceramic?
Earthenware vs stoneware? Porcelain vs some other mix?
In my understanding, clay is the raw material, ceramic is the final material post firing. After it reaches about 1100 degrees F clay goes through quartz inversion and becomes ceramic. Earthenware is limited to about cone 04 (~1800 F I think), much beyond that and it will melt. Stoneware is good to cone 10 (~2350 F) and then will melt. The clay is fired to its max temp so that it is "matured" and solid. It will ring like a bell if it is well fired.
Porcelain is simply a very, very refined stoneware.
I'm sure its made of something durable and designed for the function. Ceramicists are very involved with the materials that they use, the chemistry that is involved, and the function of the products they produce. Many mix their own clay from raw powders and most mix their own glazes.
The only way to really know what it kind of clay it is made of is to call the manufacturer. I'm sure its a durable type of clay well suited to its purpose.
I was suggesting to be cautious with the fast cooling in case there is any unknown damage. A hairline crack can easily turn into a full fledged break. Inspect that baby before firing it up.
Hope it helps.