Precision Calcined Alumina

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Description

GNPGraystar’s Precision Calcined Alumina is aluminum oxide (shape: Hexagonal Platelets) that has been heated at temperatures in excess of 1,050°C (1,922°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 2,000°C [3,632°F]).

This material data has been provided by GNPGraystar Specialty Materials.

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

Properties

General

PropertyValueComment

Particle size range

1.0 - 50.0 µm

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different specifications, please refer to the table below

True particle density

3.95 g/cm³

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pH Value

7.5 - 11.0 [-]

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Mechanical

PropertyValueComment

Hardness, Knoop, HK2

2100 [-]

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Knoop (100)

Hardness, Mohs

9.0 [-]

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Thermal

PropertyValue

Melting point

2000.0 °C

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Chemical properties

PropertyValueComment

Aluminium

99.59 %

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Al₂O₃

Iron

0.03 %

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Fe₂O₃

Silicon

0.03 %

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SiO₂

Sodium

0.35 %

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Na₂O

Technological properties

Property
Application areas

GNPGraystar’s Precision Calcined Alumina is used primarily for lapping and polishing of various products including precision optics, piezo electronics, precision bearings, optical glass, sime-conductor quartz, stainless steel, Gallium Arsenide, Germanium, and more.

Color

White

Crystal structure

Monocrystalline Alpha Alumina

Other

Sizing Available (in Microns):

1, 3, 5, 7, 9, 12, 15, 18, 20, 25, 30, 40, and 50

Suspension treatment available for water and oil-based lapping applications.