Glossary

The porosity of the fired ceramic is primarily responsible for the microwave suitability. As soon as water penetrates into the pores of the ceramic body, the water is also (very) heated strongly in a microwave device, so that there is an acute risk of burns on the ceramic surface ! Since a sintered stoneware or porcelain body has a water absorption of less than 2%, penetration of moisture into the body is not to be expected. In the case of porous earthenware, on the other hand, the glaze must permanently seal the body at all points (i.e. also on the floor surface) so that the absorption of moisture is prevented.

 

It is known that metallic surfaces are not suitable for use in microwaves. Some of our effect glazes such as Bronze or Gold, however, create precisely these surfaces with metallic precipitates. Such metal surfaces reflect the microwaves, which can cause the ceramic to overheat. However, since a glaze with a metallic surface is not classified as acid-resistant and is therefore not suitable for dishes, there is usually no need to ask for specific information on microwave suitability.

 

For more information, see entry: Acid resistance