Characteristics
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).
Applications
HTV silicone rubber & LSR
Coatings & printing ink
Adhesives & Sealants
Powder Coatings
Properties
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
| Properties | Unit | Typical Value | Testing Method |
| Specific surface area(BET) | m2/g | 170±30 | GB/T 20020 |
| pH value in 4% dispersion （H2O：Ethanol=1:1） | - | 6.0～9.0 | GB/T 20020 |
| Loss on drying(2 hours at 105℃) | % | ≤0.7 | GB/T 20020 |
| Loss on ignition(2 hours at 1000℃ based on material dried for 2 hours at 105℃) | % | ≤4.0 | GB/T 20020 |
| Silica Content(Based on ignited material) | % | ≥99.8 | GB/T 20020 |
| Tamped Density（Based on material dried at 105℃ for 2 hours） | g/dm³ | 40～60 | GB/T 20020 |
| Carbon Content (Based on material dried at 105℃ for 2 hours) | % | 1.5～2.5 | GB/T 20020 |
