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Dishwasher Safe
Dishwasher safety is a concern in ceramic table ware, especially if the ware has been imported or made by a small company or potter.
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Details
Dishwasher safe ceramic ware is generally ware that is not overly absorbent and therefore will not water log in use over time (and therefore weaken and become a microwave oven hazard). Dishwasher safety also refers to the ability of ware to handle the changes in temperature it will be subjected to without cracking of the ware or the glaze. To produce ware that can withstand these temperature changes glazes must be thermal expansion compatible with the body (there are many articles and videos here about how to achieve that). The indicators of lack of expansion compatibility are crazing and shivering.
Related Information
Links
| Glossary |
Food Safe
Be skeptical of claims of food safety from potters who cannot explain or demonstrate why. Investigate the basis of manufacturer claims and labelling and the actual use to which their products are put. |
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| Glossary |
Co-efficient of Thermal Expansion
The co-efficient of thermal expansion of ceramic bodies and glazes determines how well they fit each other and their ability to survive sudden heating and cooling without cracking. |
| Glossary |
Thermal shock
When sudden changes in temperature cause dimensional changes ceramics often fail because of their brittle nature. Yet some ceramics are highly resistant. |
| Glossary |
Clay Body Porosity
In ceramics, porosity is considered an indication of density, and therefore strength and durability. Porosity is measured by the weight increase when boiled in water. |
| Glossary |
Glaze Durability
Ceramic glazes vary widely in their resistance to wear and leaching by acids and bases. The principle factors that determine durability are the glaze chemistry and firing temperature. |
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