Characteristics
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).
Applications
RTV silicone sealants,especially electronic potting and Liquid glue
Adhesives and Sealants
Coatings & Printing ink
Powder Coatings
Properties
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
| Properties | Unit | Typical Value | Testing Standard |
| Specific surface area(BET) | m2/g | 140±20 | GB/T 20020 |
| pH value in 4% dispersion （H2O：Ethanol=1:1） | - | 5.0～8.0 | 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℃) | % | ≤2.0 | 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) | % | 0.7～1.3 | GB/T 20020 |
