HIFULL HB-620 is hydrophobic fumed silica which is produced by hydrophilic fumed silica with specific surface area of 240m2/g after chemical post-treatment with HMDS (Hexamethyldisilazane).



HTV silicone rubber & LSR

Coatings & printing ink

Adhesives & Sealants

Powder Coatings


Reinforcing filler for elastomer

High hydrophobicity and stable thixotropy

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

Free flow aid and anti-caking aid for powders

Rheological control for adhesives and sealants


Physical & Chemical Data

PropertiesUnitTypical ValueTesting Method
Specific surface area(BET)m2/g170±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℃)%≤4.0GB/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)%1.5~2.5GB/T 20020