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Mullite Crystals


These grow in the porcelain matrix during firing and are a big reason why vitrified porcelain is so strong (the fired porcelain matrix is not just a bunch of silica particles glued together with feldspar glass, it has a complex structure, mullite is a key part of that). Mullite crystals are converted from kaolin particles and are long, producing a fibrous mesh.

In Bound Links

  • (Glossary) Fired Strength

    The fired strength of clays can be measured. The test is sometimes called M.O.R. or modulus of rupture, recognizing the fact that brittle ceramics fail suddenly (as opposed to others that fail after some plastic deformation). It is also known simply as tensile strength (because the point of failure ...


By Tony Hansen




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