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Natural Clay

La terra cruda fornace fonti

For a long time the furnaces, characterized and authorized from the decree Ronchi (D.M. 25/02/98),used like to digest of mud of industrial workings, characterized they give the Ronchi decree, mud that, also if not injurious, denaturalized the heavy raw material inserting in the structure, metals, chemical compounds, that they can generate of the efflorescence and hat, however, incorporeted in the product , elements strangers to the natural clay.

The Fornace Fonti s.r.l. guarantees that its products are made with virgin clay of the Po plain, free from whichever additived of mud or industrial powders.  

The naturally-occurring clay found in all parts of the world is the base material used in all our earthenware. The clay is created through a formation process that lasted millions of years and that brought about the disintegration of igneous rock. Atmospheric events like rain, wind, ice etc. caused the decomposition of the rock, transforming it into clay.

Its plasticity is its most important property, and is exclusive to it out of all the materials on earth. It is able to take any form and maintain it.
Natural clays are classified according to their plasticity, and the colour they assume before and after kilning. It is the impurities that give colour and plasticity. The purpose for which the clay is used is determined by its plasticity. After kilning, the clay hardens and is once more stone-like. The clays with fewer impurities are: the whitest after baking, the least plastic, kilned at higher temperatures and also the rarest because they remained in the area of their formation.

Argille naturali  Argille naturali  Argille naturali

  Argille naturali


Clay is baked at at least 700 degrees Celcius, that is the required temperature needed to make it hard and robust. The higher the temperature used in kilning, the more compact, hard and glass-like the clay will be. Some clays, for instance the Chinese or porcelain clays, continue to harden even after the “cone 14” (1400 degrees); however at a certain point they all become softer and turn into glass.
Our products are kilned at variable temperatures between 980 and 1050 degrees Centigrade


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