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Quartzite Gravel is used as a support media in rapid gravity and pressure filters to provide both
protection for the floor nozzles and an even hydraulic distribution over the whole filter area.
| Standards | |
| UK and European | EN12904 |
| Physical Characteristics | |
| Shape | Rounded |
| Specific Gravity | 2.65 |
| Bulk Density | 1.60 kg/litre |
| Hardness | 6 - 7 Moh |
| Acid Solubility | less than 2.0% |
| Sulphate Content | below 0.1gm/litre |
| Chemical Analysis | |
| Silica | 95 - 97% |
| Aluminum Oxide | c 1.35% |
| Ferrous Oxide | c 0.40% |
| Calcium Oxide | c 0.40% |
| Sodium Oxide | c 0.35% |
| Magnesium Oxide | c 0.30% |
| Potassium Oxide | c 0.20% |
| Titanium Oxide | c 0.09% |
| Standard Grades (sizes in mm) | |
| Grade | Size Range |
| 3mm | 2.30 - 4.75 |
| 4mm | 3.20 - 6.40 |
| 6mm | 4.00 - 8.00 |
| 10mm | 6.70 - 13.20 |
| 15mm | 12.70 - 19.10 |
| 20mm | 14.00- 25.00 |
| 40mm | 25.00 - 45.00 |
copyright Western Carbons Ltd 2010