Colloidal silicon dioxideclassification: silicon dioxide cas no.: 7631-86-9 other names: pyrogenic silicamf: sio2 einecs no.: 231-545-4 model number: f-150, f-200, f-380grade standard: industrial grade purity: 99.99% appearance: white amorphous powderapplication: for industrial use only brand name: fusil model number: f-150, f-200, f-380 specificationscoloidal silica 1.direct manufacturer 2.good transparency 3good disperse heat good suspension, good flatting efficiency, colloidal silica (sio2)items dx-500 dx-520 dx-520w dx-530 dx-530w dx-550 dx-550wform white powder white powder white powder white powder white powder white powder white powderwhiteness 98 98 98 98 98 98 98sio2 (dry basis) % 99.9 99.9 99.9 99.9 99.9 99.9 99.9pore volume ml/g 1.4-1.6 1.8-2.0 1.8-2.0 1.8-2.0 1.8-2.0 1.8-2.0 1.8-2.0ph value 6.5-7.5 6.5-7.5 6.5-7.5 6.5-7.5 6.5-7.5 6.5-7.5 6.5-7.5bet surface area m2/g 260-280 290-310 290-310 290-310 290-310 290-310 290-310dbp absorption value ml/100g 280-320 300-320 300-320 300-320 300-320 180-200 180-200average particle size um 4-5 4-6 4-6 3-4 3-4 4-6 4-6sieve residue (45um) % .