We implement strict testing parameters at every production step. Sourced limestone raw inputs and ground powders undergo systematic analysis in our dedicated laboratory.
In industrial B2B manufacturing, a slight change in particle size distribution (PSD) or whiteness index can disrupt your entire processing line.
Our laboratory checks every batch of Ground Calcium Carbonate. We ensure the moisture content remains below 0.12%, preventing clumping or blockages during pneumatic conveying and compound extrusion. Sieve testing is conducted continuously to ensure zero grit residue.
Standard laboratory values guaranteed across our Ground Calcium Carbonate powder range.
| Chemical Compound | Typical Value | Max Limit |
|---|---|---|
| Calcium Carbonate (CaCO₃) | 98.85% | 98.50% Min |
| Magnesium Oxide (MgO) | 0.25% | 0.40% Max |
| Silica (SiO₂) | 0.08% | 0.15% Max |
| Iron Oxide (Fe₂O₃) | 0.015% | 0.03% Max |
| Alumina (Al₂O₃) | 0.04% | 0.08% Max |
| Property | Standard Value | Test Instrument |
|---|---|---|
| Whiteness (L*) | 98.0% - 98.5% | HunterLab Colorimeter |
| Brightness (ISO) | 96.5% - 97.0% | Reflectance Spectrophotometer |
| Specific Gravity | 2.7 g/cm³ | Gas Pycnometer |
| Moisture Content | < 0.12% | IR Moisture Balance |
| pH Value (10% Slurry) | 8.5 - 9.5 | Digital pH Meter |
