Characteristics
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).
Applications
Elastomers, HTV silicone rubber and LSR
Coatings & printings ink
Defoamer
Carbon Powder for Printer
Properties
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
| Properties | Unit | Typical Value | Testing Method |
| Specific surface area(BET) | m2/g | 330±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℃) | % | ≤5.0 | 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) | % | 2.5～4.0 | GB/T 20020 |
