| 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 |
|
|
