The quality of white Calcium Carbonate Powder is a key element in Son Nam commitment. The quality is controlled by automatic electronic system. Beside, Son Nam always take the daily powder samples test to control the quality in the laboratory with modern equipment such as: the UK's MALVERN 3000E laser particle analyzer, MINOTA CR-410 whiteness meter. Particularly for each shipment, before the goods are delivered to customers, the white stone powder is re-checked to ensure that the powder products meet the requirements of customers.