The term feuerfest means oven proof and is usually only found on various types of ceramics. However, it can sometimes be found on items that appear to be porcelain.
Several German manufacturers held patents on ovenproof porcelain derivatives. To name just two, Mitterteich AG (Mitterteich, Bavaria) marketed their products under the "Porzeton" brand, while Schirnding AG (Schirnding, Bavaria) sold theirs under the "KOSAG" brand.
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