Aluminum Oxide 12 micron (800 grit)

Aluminum Oxide 12 micron (800 grit)

Aluminum Oxide is a hard, rounded material primarily used for fine grinding. It typically does not fracture into smaller pieces in use. It's more rounded particle shape make it less aggressive, so it grinds more slowly but leaves a smoother surface on the glass. It comes in white color. White Fused Aluminum Oxide is a high purity fused aluminum oxide.  It achieves its white color as it is lower in impurities than brown or pink fused aluminum oxide.  It typically has higher friability than brown fused aluminum oxide.  With a Mohs hardness of 9, Aluminum Oxide is a high strength, wear-resistant material possessing a strong ability to resist vigorous chemical attacks (such as acid and alkali) at extreme temperatures.   Its high degree of refractoriness, along with its superior electrical insulating properties, dielectric properties, and high melting point make White Fused Aluminum Oxide a desirable material choice for a diverse range of applications.  It's an important mineral with chemical and high temperature stability, great purity, hardness and fireproof and refractory characters. White fused alumina is one of the most widely used raw materials for so many industrial fields, including refractory, bonded abrasives and coated abrasives industries.

Application:

  • Refractories
  • Grinding
  • Polishing
  • Lapping
  • Metal Preparation
  • Laminates
  • Coatings
  • Filtration
  • Abrasives
  • Refractory
  • Polishing
  • Milling
  • Filler
  • Electrical Insulator

99.5% Aluminum Oxide

Mechanical

Units of Measure

SI/Metric

(Imperial)

Density

gm/cc (lb/ft3)

3.89

(242.8)

Porosity

% (%)

0

(0)

Color

ivory

Flexural Strength

MPa (lb/in2x103)

379

(55)

Elastic Modulus

GPa (lb/in2x106)

375

(54.4)

Shear Modulus

GPa (lb/in2x106)

152

(22)

Bulk Modulus

GPa (lb/in2x106)

228

(33)

Poisson’s Ratio

0.22

(0.22)

Compressive Strength

MPa (lb/in2x103)

2600

(377)

Hardness

Kg/mm2

1440

Fracture Toughness KIC

MPa•m1/2

4

Maximum Use Temperature 
(no load)

°C (°F)

1750

(3180)

Thermal

     

Thermal Conductivity

W/m°K (BTU•in/ft2•hr•°F)

35

(243)

Coefficient of Thermal Expansion

10–6/°C (10–6/°F)

8.4

(4.7)

Specific Heat

J/Kg•°K (Btu/lb•°F)

880

(0.21)

Electrical

     

Dielectric Strength

ac-kv/mm (volts/mil)

16.9

(420)

Dielectric Constant

@ 1 MHz

9.8

(9.8)

Dissipation Factor

@ 1 kHz

0.0002

(0.0002)

Loss Tangent

@ 1 kHz

Volume Resistivity

ohm•cm

>1014

 

Typical Analysis

Characteristics

AlO2

99.5%

Crystal Form

Rhombohedral Class

TiO2

0.0995%

Chemical Nature

Amphoteric

SiO(not free)

0.05

Specific Gravity

3.95 grm/cc

Fe2

0.08

Bulk Density

116 lbs/ ft3

MgO

0.02

Hardness

KNOPPS = 2000, MOHS = 9

Alkali (Soda & Potash)

0.30

Melting Point

2,000°C

 

 

Reaction with Acids

Subject to mild attack by aqua regia and/or Hydrofluoric