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| Insoluble matter in water | 0.005% Max | 
| Residues on ignition (As sulphate) | 0.01% Max | 
| Sulphate (As SO4) | 0.01% Max | 
| Heavy metal (Pb) | 10ppm Max | 
| Iron (Fe) | 5ppm Max | 
| Chloride (Cl) | 0.001% Max | 
	



 
        