HIFULL HB-630 is hydrophobic fumed silica which is produced by hydrophilic fumed silica with specific surface area of 400m2/g after chemical post-treatment with HMDS (Hexamethyldisilazane).


Elastomers, HTV silicone rubber and LSR

Coatings & printings ink


Carbon Powder for Printer


High reinforcement and transparency in HTV and LSR

High hydrophobicity and stable thixotropy

Anti-settling and anti-sagging agent in coatings and printing ink

High anti-foam property

Free flow aid and anti-caking aid for powders


Physical & Chemical Data

PropertiesUnitTypical ValueTesting Method
Specific surface area(BET)m2/g330±30GB/T 20020
pH value in 4% dispersion(H2O:Ethanol=1:1)-6.0~9.0GB/T 20020
Loss on drying(2 hours at 105℃)%≤0.7GB/T 20020
Loss on ignition(2 hours at 1000℃ based on material dried for 2 hours at 105℃)%≤5.0GB/T 20020
Silica Content(Based on ignited material)%≥99.8GB/T 20020
Tamped Density(Based on material dried at 105℃ for 2 hours)g/dm³40~60GB/T 20020
Carbon Content (Based on material dried at 105℃ for 2 hours)%2.5~4.0GB/T 20020