... Size:0.8-1.5,1-1.8,1-2, 2-3, 2.5-3, 2-4, 4-8, 8-16mm Good quality, ... :0.8-1.5,1-1.8,1-2, 2-3, 2.5-3, 2-4, 4-8, 8-16mmGood quality,Relative ... water filtration . Physical Data: Density g/cm31.8 ~ 2.2Filtering velocity m/h4 ~ 12Unit weight g/cm31.4Wear rate %<0.5Voidage ... 1.0Hydrochloric acid soluble rate %≤0.1All exhange capacity mg/g2.2 ~ 2.5 Test ItemTest ResultTest ItemTest ResultWear Rate≤0.05%Specific ...