Main specifications of Glass Balls
| Material Properties GLASS bALLS | Units | Soda Lime | Borosilicate | Black | Quartz (SiO2) |
|---|---|---|---|---|---|
| Specific gravity or Density | g/cm3 | 2,5 | 2,23 | 2,57 | 2,2 |
| Young’s modulus | E (GPa) | 70 | 64 | 66 | 73 |
| Refractive index | n | 1,518 | 1,471 | 1,520 | 1,459 |
| Softening temperature (Room) | ºC | 726 | 821 | 650 | 1650 |
| Coefficient of lineair thermal expansion (20ºC to 1000ºC) | X10(-6)/ºC | 9.4 | 3,30 | 7,2 | 0,5 |
| Thermal conductivity Roomtemperature) | W/(m.K) | 1,0 | 1,15 | 0,76 | 1,42 |
| Volume resistivity | Ohm*m | <1 | >10(15) | >10(14) | >10(15) |
| Relative magnetic permeability | mu | <1 | <1 | <1 | <1 |
| Hardness | Mohs | 6 | 6 | 6 | 7 |
| Ultimate compressive strenght | psix10(3) | 131-159 | 275-305 | 109-138 | 152-166 |
| Available in sizes | mm | 1 – 100 | 1 – 100 | 1 – 100 | 0,3 – 10 |
| Chemical and Main SpecificationS | Soda Lime | Borosilicate | Black | Quartz (SiO2) |
|---|---|---|---|---|
| SiO2 | 63-81% | 65-85% | 65-75% | 99,9% |
| MgO | < 6% | – | – | – |
| AL2O3 | < 2% | 1-5% | max 1% | – |
| LIO2 | <2% | – | – | – |
| Na2O | 9-15% | 3-9% | 9,5-15,5% | – |
| CaO | 7-14% | max 2,5% | – | |
| MnO2 | – | – | 5-7% | – |
| TiO2 | max 0,8% | – | – | – |
| Fe2O3 | max 0,8% | – | – | – |
| PbO | max 0,01 | – | – | – |
| K2O | max 1,5% | max 2% | 2-3% | – |
| Other | 0,01% |
Three other availabla types of Glass Balls
Black Glass Balls: Medical and chemical flowmeters, aircraft slips, turn indicators. Variety of functions, most common use into precision instruments.
Borosilicate: Special valves, safety valves, metering pumps. They are used in the pharmaceutical field and photographic devices.
Quartz (SiO2): Optical devices and anti-reflective coatings.
Most common shape is the ball, spherical, shape. The smaller media are often beads or micro beads, For beads the shape is not always spherical. Most of the media can also have other shapes. Please ask if you have special requirements.