... white, has massive, spherical shape. Average pore size is 8.0-10.0nm, specific surface area is 300-300 m2/g ... Specifications:Itemsvaluesuperiorfirst gradequalifiedParticle diameter, mm4.0-8.02.0-5.64.0-8.02.0-5.64.0-8.02.0-5.6Size qualification, %≥9490Attrition rate ... , %≤4668810Bulk density, ml/g≥400Pore volume, %0.850 ...