Calcined Alumina 100

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GNPGraystar’s Precision Calcined Alumina is aluminum oxide that has been heated at temperatures in excess of 1050°C (1922°F) to drive off nearly all chemically combined water. In this form, alumina has great chemical purity, extreme hardness (9 on the Mohs hardness scale, on which diamond is 10), high density, and a high melting point (slightly above 2000°C [3632°F])

This material data has been provided by GNPGraystar Specialty Materials.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts




Bulk density

0.9500000000000001 g/cm³

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Particle size range

60.0 - 80.0 µm

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Specific surface area

75.0 m²/g

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Melting point

2000.0 °C

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Chemical properties



99.3 %

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min. Al₂O₃



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max. CaO



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max. Fe₂O₃



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max. SiO₂



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max. Na₂O

Technological properties

Application areas

GNPGraystar’s Calcined Alumina is used in refractory applications as well as ceramic applications including spark plugs, tap washers, pump seal, electronic substrates, grinding media, abrasion resistant tiles, cutting tools, bioceramics, body armor, laboratory ware, and wear parts for the textile and paper industries.

It is also used as a friction material in brake linings, in potting compounds to disperse heat, and in polishing, lapping, and buffing compounds.