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]).

Los datos sobre este material han sido proporcionados por GNPGraystar Specialty Materials.

A menos que se indique lo contrario, todas las medidas corresponden a condiciones de temperatura ambiente. A menos que se indique lo contrario, se utilizan las unidades del SI.
Las normas armonizadas son similares a uno o varios estándares del proveedor. Es posible que algunas normas armonizadas se ajusten al estándar original, mientras que otras pueden quedar fuera de su alcance.

Ashby charts

Propiedades

General

PropertyValueComment

Rango de tamaño de partículas

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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Valor de pH

7.5 - 11.0 [-]

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Mecánica

PropertyValueComment

Dureza (en mohs)

9.0 [-]

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Dureza Knoop HK2

2100 [-]

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Knoop (100)

Aplicaciones térmicas

PropertyValue

Temperatura de fusión

2000.0 °C

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Chemical properties

PropertyValueComment

Aluminio

99.59 %

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Al₂O₃

Hierro

0.03 %

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Fe₂O₃

Silicona

0.03 %

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SiO₂

Sodio

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.