Digitalfire Ceramic Glossary

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Surface Area


The physical working behavior and properties of plastic bodies and glaze and body slurries is mainly determined by the nature of the particles that make them up. Individual particles have sizes, shapes, densities, surface texture and reactivity and unique chemistries and mineralogies. Even the mixture of sizes, or size distribution is a major factor. The total surface area of all particles can be measured and provides a number that can help explain important physical properties. The smaller particles are the more surface area is exposed to the water and the greater to total forces acting between particles and particles and water. Kaolins have comparatively large particles compared to ball clays and thus have a much smaller surface area. Only a gram of ball clay can have many square meters (even dozens of square meters) of surface area.

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