Rock Phosphate, Color : Brown, Grade Standard : Industrial Grade

P₂O₅ Content (Phosphorus Pentoxide): 28% – 34% (commercial grade)

Citrate Solubility (CSP): Minimum 2% – 3% (for Direct Application Phosphate Rock – DAPR)

Moisture: Max 2% – 3%

Mesh Size (fineness): 90% passing through 100 mesh (for better solubility)

CaO (Calcium Oxide): 45% – 50%

SiO₂ (Silica): 4% – 8% (lower is better)

Fe₂O₃ + Al₂O₃ (Iron & Alumina): Max 3% – 4%

Chlorides & Sulphates: Trace levels (should be minimal)

Cadmium (Cd): Below 10 ppm (Indian regulations restrict heavy metals)