supply of activated alumina balls for service air dryers and instrument air dryers in unit-i ii. , supply of activated alumina balls for service air dryers and instrument air dryers in unit-i & ii. , supply of activated alumina balls for service air dryers and instrument air dryers in unit-i & ii. technical specification: size: 5 to 8mm (in 50 kgs.air tight drum packing) moisture:2% max particle diameter: 2.0 to 5.0mm ph of 6% solution:4.6 min, 8.0 max aluminum oxide (as a12 03):91%min water soluble chlorides(as c1):0.7%max water soluble sulphates(as so4): 0.7% max sodium its compounds m(s na2o):0.8% max. adsorption capacity :16 to 20.3% min pore volume: 0.40ml/g.min surface area: 350m2 /g.min bulk density: 0.75g/ml. attrition, loss % by weight d) by tumbling:0.50% max e) by rotation: 1.50% max f) by crushing strength:90 min