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AluChem

AluChem AC-99 Tabular Aluminas are high-density, fully shrunk, coarse crystalline alpha aluminas that have been converted to the corundum form. Tabular Alumina is produced by sintering ball-formed calcined alumina at a temperature just under the 2040°C fusion point of aluminum oxide. These Tabular Alumina balls are then crushed, graded or screened, and ground to a wide range of granular or powdered particle size distributions.

The typical chemical and physical properties which characterize AluChem’s AC-99 Tabular Aluminas are presented in this product data. Some of these properties are highlighted by the following:

Chemical purity
99.5% Al₂O₃

Chemical inertness
Resistant to most alkalis and mineral acids

High density
True density of 3.96 with a bulk specific gravity of 3.55 and an apparent porosity of 4.0%

Low water absorption
1.0%

Extreme hardness
9 on the Mohs' scale and a Knoop hardness of 2,000

High thermal conductivity
@ 100°C 0.069 cal/sec cm °C

Good resistance to thermal and mechanical shock

High heat capacity
Specific heat @ 20°C 0.21 cal/gm/°C

High electrical resistivity

Excellent abrasion resistance

General Characteristics

Chemical Formula
Al₂O₃

Bulk Specific Gravity
3.55

Apparent Porosity
4.0%

Water Absorption
1.0%

Melting Temperature
2040°C

Refractive Index
1.76

Mohs' Hardness
9

Appearance
White Crystalline Granules or Powder

Typical Chemical Composition

Properties
AC-99

Al₂O_3, %
99.5

SiO_2, %
0.04

Fe₂O_3, %
0.06

Na₂0, %
0.30

L.O.I. (300 - 1200°C), %
0.00

Alpha Phase
99+

Tyler Sieve Specifications for Standard Products

Screened Convertor Discharge Balls
Size

-3/4 Inch + 1/2 Inch

Crushed Sizes
Sieve Analysis

5% Max. On

Minus 1/4 Inch
1/4 Inch

Minus 6 Mesh
6 Mesh

Minus 8 Mesh
8 Meshh

Minus 14 Mesh
14 Mesh

Minus 28 Mesh
28 Mesh

Ground Sizes
Sieve Analysis

5% Max. On

Minus 48 Mesh
48 Mesh

Minus 60 Mesh
60 Mesh

Minus 100 Mesh
100 Mesh

Minus 325 Mesh
325 Mesh

Minus 325 Mesh
Low Iron 325 Mesh

Graded Sizes
Sieve Analysis
Sieve Analysis

2% Max. On
5% Max. Through

1/4 Inch to 8 Mesh
1/4 Inch
10 Mesh

3 Mesh to 6 Mesh
3 Mesh
8 Mesh

6 Mesh to 14 Mesh
6 Mesh
20 Mesh

8 Mesh to 14 Mesh
8 Mesh
20 Mesh

14 Mesh to 28 Mesh
14 Mesh
35 Mesh

28 Mesh to 48 Mesh
28 Mesh
65 Mesh