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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.

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Glossary	Fired Strength Ceramics, by their brittle nature, have high compressive strength. But in functional ceramics we are more concerned about the tensile strength as this relates better to serviceability.

By Tony Hansen

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