1) Iodine absorption number: 36±6g/kg
2) DBP absorption number: 90±7cm3/100g
3) DBP absorption number of compressed sample: 66 ~ 82cm3/100g
4) CTAB surface area: 29 ~ 43cm2/g
5) Nitrogen surface area: 29 ~ 41cm2/g
6) Heating loss: ≤1.5%