... ~5.0Abrasion rate, %≤ 0.25≤ 0.25≤ 0.25Bulk density, g/ml≥ 0.65≥ 0.65≥ 0.65Static water absorption, %≥ 20 ... , %≥ 12.0≥ 12.0≥ 12.0Specific surface area, m 2 /g≥ 100≥ 100≥ 100Compressive strength point contact strength, N/grain≥ 50 ... .5≤ 1.5 0.25%,0.5%,1%,5%,10%,15% Palladium catalyst