Ink manufacturers use precipitated Calcium Carbonate as an ant settling agent. As an ant settling agent, Precipitated Calcium Carbonate works as an extender assisting in the control of strength and body of the ink.
| Chemical Properties | |
|---|---|
| CaCO3 % by Weight | 98.25 ± 0.25 |
| Lead as pb | 10 ppm Max. |
| Copper as Cu | 2 ppm Max. |
| Arsenic as As | 2 ppm Max. |
| Sulphate as SO4 | 0.4% Max. |
| Soluble alkali as Na2O | 0.25% Max. |
| Silica as SiO2 | 0.5% Max. |
| Iron as Fe | 250 ppm Max. |
| Matter insoluble in HCL | 0.5% Max. |
| pH | 9.5 ± 0.5 |
| Phosphate | 20 ppm Max. |
| Chloride as Cl | 20 ppm Max. |
| Magnesium as MgO | 0.5% Max. |
| Flouride as F | 20 ppm Max. |
| Physical Properties | |
|---|---|
| Whiteness | 95 Min. |
| Crystal Structure | Argonite |
| Water Absorption | 80 to 85 ml/100 gm |
| Oil Absorption | 60 to 65 ml/100 gm |
| Loss on Drying at 105o C | 0.5% Max. |
| Specific Gravity | 2.6 to 2.9 |
| Bulk Density | 0.40 to 0.45 gm/ml |
| Average Particle Size | 5 to 7 μm |
| Residue on 300 mess | 0.2% Max. |