Breviary Technical Ceramics






5.3.2 Porosity

As a rule, technical ceramic materials have no open porosity, and are thus gas tight. For some materials, however, porosity is desirable. This may be because thermal stresses are more easily managed by porous materials, or because larger surface areas are required. Porosity can be deliberately generated through the appropriate selection of raw materials, the manufacturing process, and in some cases through the use of additives. This allows closed and open pores to be created with sizes from a few nm up to a few µm.

Test procedures for determining open porosity are specified in DIN EN 623-2.


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