| 1 . | Physical Properties | ||
| 1.1 | Composition | SiO 2 | |
| 1.2 | Structure | Amorphous | |
| 1.3 | Colour | Transparent or white | |
| 1.4 | Melting Temperature | approx.1750 ºC | |
| 1.5 | Specific Gravity | 2.21g/cm 3 | |
| 1.6 | Hardness | 7 Mohs | |
| 1.7 | Thermal Expansion | 0.5*10 -6 | |
|
2 . |
Chemical Properties |
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| Grade A 30-50mm | |||
| 2.1 | SiO 2 | >99.9% | |
| 2.2 | Al 2 O 3 | <100ppm | |
| The finer the power,the higher the Al2O3,as powder is produced by ball mill with Alumina ball. | |||
| 2.3 | Fe 2 O 3 | <30ppm for grains | |
| 2.4 | CaO | <15ppm | |
| 2.5 | Na 2 O | <15ppm | |
| 2.6 | K 2 O | <15ppm | |