GRINDING MEDIA

1. Glass Beads
[ Typical Analysis ]
SiO2 - 72.5%
NaO - 13.7%
CaO - 9.8%
MgO - 3.3%
A12O3 - 0.4%
FeO;Fe2O3 - 0.2%
K2O - 0.1%
B2O - 0%
[ Thermal Properties ]
Softening point - 737 0C
Thermal Conductivity - 1.10 W/mK
Expansion of
Co-efficient (0-3000C)
- 7.75 x 10-6 / K
Specific Heat - 770 J / kgK
[ Physical Properties ]
Specific Gravity - 2.45-2.55 g / cm3
Refractive Index - 1.51 - 1.52
Hardness Mohs 6
Rockwell - 47 RC
OPH 50 g load - 540 kj / mm2
Knoop 100 g load - 517 kj / mm2
Coefficient of friction  
Static - 0.9 - 1.0
Dynamic - 0.7 - 0.8
[ Chemical Properties ]
Oil Absorption - 17 g Oil / 100 g sphere
Chemical resistance
(Powder test)
 
4 hours in H2O extracted
at 900C
- 0.05% Na2O
4 hours in N/50 H2SO4 extracted at 900 C - 0.03% Na2O
 2. Carbon Steel Balls EN-9
C 0.50 to 0.60% S 0.06% Max
MN 0.50 to 0.80% SI 0.05% to 0.35%
P 0.06% Max    
3. Chrome Alloy Steel Balls EN - 31
C 0.9 TO 1.2% S 0.05% Max
MN 0.30 to 0.75% SI 0.10% to 0.35%
P 0.06% Max CR 1.00 to 1.60%
4. Steatite Balls
Physical Properties
Hardness (mohs Scale) 7.5
Specific Gravity 2.65
Water absorption 0
Flexural Strength 1300 KG/cm2
Compressive strength 8500 KG/cm2
Co-efficient of thermal
expansion (20-10000C)
8.5 X 10-6/0K
Colour Off White
  Chemical Analysis
Si.O2 61.50%
Mg O 27.40%
Ba O 3.20%
Al2 O3 6.80%
Fe2O 0.50%
Na2O 0.10%
Ca O` 0.50%
5. Agate Pebbles
SILICA (as SiO2) 98.12
ALUMINIUM (as Al2O3) 0.84
FERRIC OXIDE (as Fe2O3) 0.02
SPECIFIC GRAVITY 2.92
HARDNESS ON MOH's
SCALE BETWEEN 6 & 7
 
 

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