HIFULL HB-612 is hydrophobic fumed silica which produced by hydrophilic fumed silica with specific surface area of 150m2/g after chemical post-treatment with HMDS (Hexamethyldisilazane).



RTV silicone sealants,especially electronic potting and Liquid glue

Adhesives and Sealants

Coatings & Printing ink

Powder Coatings


Thixotropy and reinforcement in RTV silicone sealants, the hydrophobic feature enables RTV silicone sealants a long guarantee time

Rheological control of RTV silicone rubber

Anti-settling,anti-sagging and thixotropy agent

Free flow aid and anti-caking aid for powders

 Physical & Chemical Data

PropertiesUnitTypical ValueTesting Standard
Specific surface area(BET)    m2/g140±20
GB/T 20020
pH value in 4% dispersion (H2O:Ethanol=1:1)-5.0~8.0GB/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℃)%≤2.0GB/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)%0.7~1.3GB/T 20020