Characteristics
HIFULL HB-139 is hydrophobic fumed silica which is produced by hydrophilic fumed silica with specific surface area of 180m2/g after chemical post-treatment with PMDS (Polydimethylsiloxane).
Applications
Silicone rubber
Coatings and printing ink
Adhesives and Sealants
Greases and cable gel
Unsaturated resin
Powders
Properties
Good thickening and thixotropy property
Good anti-sagging properties and excellent stability in epoxy resin
Excellent reinforcing properties in silicone rubber especially at high filler loading levels and no crepe hardening on aging
Good transparency performance
Free-flow property for water-proof material and powders
Physical & Chemical Data
| Properties | Unit | Typical Value | Testing Standard |
| Specific surface area(BET) | m2/g | 100±20 | GB/T 20020 |
| pH value in 4% dispersion （H2O：Ethanol=1:1） | - | 5.5～7.5 | GB/T 20020 |
| Loss on drying(2 hours at 105℃) | % | ≤1.5 | GB/T 20020 |
| Loss on ignition(2 hours at 1000℃ based on material dried for 2 hours at 105℃) | % | ≤10 | 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) | % | 4.5～6.5 | GB/T 20020 |
