Unglazed bottoms

Unglazed bottoms of Porcelain

Many porcelain items are expressly manufactured with unglazed bases and bottoms. Baking tins, tarts, GN trays and many more are articles that are used for heat transfer by contact heat, among other things. In order to ensure this, the porcelain item must not have an adjusting ring and should lie "flat" on the heat source.

Since the porosity of porcelain has a density of max. 0.05 my, the unglazed area does not represent any restriction on the function or use of the article. It can happen that a porcelain article (purely) has optical wounds on the underside. Residues of fireclay, sand or minimal porcelain splinters on the firing carriage often leave "firing residues" in the smooth bottoms, but these are part of the normal product image of an article with a flat bottom.

With longer use the bottoms can become discoloured. Crystalline solids settle in the pores and form the breeding ground for stainless steel abrasion or dust firing. This is quite normal and does not represent a hygienic disadvantage when cleaned properly and can be completely removed again with any porcelain cleaner.