We now just released the MSDS data sheet for alumina grinding media ball, you can find this document at: http://www.alumina-ball.com/resources.html

Abstract:
ALUMINA GRINDING BALL TECHNICAL DATA SHEET
1. Chemical composition
AL2O3    :   92% Min, WT
2. Specific Properties
Sizes    :   40 mm, ±1.5mm
Density    :   3.60 g/cm3
3. Typical physical properties
Material hardness  :   9 (Mohs hardness)
4. Product details
Commodity name  :   Alumina grinding ball
Manufacturer   :   HuaMing Alumina, China
Origin    :   China

For more details, pls goto: http://www.alumina-ball.com/resources.html