... Ball 1.20 years professioanl manufacture 2.ISO9001:2008 3.Size:3,6,10,13,19,25,38,50mm Inert Ceramic Ball ... of Size 3,6,10,13,19,25,38,50mm XINGFENG Catalyst bed ... gravity (g/cm3) 2.3-2.4 Free volume (%)40Operation temp.(max) (°C)1100Moh’s hardness (scale)>6.5Acid resistance (%)>99.6Alkali ... >122''(50mm)>5600>56 Inert Ceramic Ball of Size 3,6,10,13,19,25,38,50mm