Description
Physical Data
Major Phase: Â Alpha
Specific Gravity: Â 3.95
Knoop Hardness: Â 1800-2200
Mohs Hardness: Â 9
Melting Point: Â 2020 C
PH: Â 7.5-11
L.O.I.: Â <.35
Particle Shape: Â Disc-like
Color: Â White
Typical Chemical Analysis
Al2O3 Â 99.20%
SiO2 Â Â Â Â .03%
Na2O Â Â Â .4%
CaO Â Â Â Â .05%
Fe2O3 Â Â .02%
Each particle is a discrete crystal of alumina having a purity of over 99%. The crystals have a smooth surface and a distinctive platelet shape with an aspect ratio of 5:1. Each particle has exceptional resistance to fracturing.