Hydrophobic Fumed Silica
Product Introduction
Fumed silica, or pyrogenic silica, colloidal silicon dioxide, is amorphous white inorganic powder which has high specific surface area, nano-scale primary particle size and a relatively high (among silica products) concentration of surface silanol groups. The properties of fumed silica can be chemically modified by reaction with these silanol groups.
Commercial available fumed silica can be divided into two groups: hydrophilic fumed silica and hydrophobic fumed silica. it is widely used as an important ingredient in many industries such as silicone rubber, paint and plastics industries.
Product Properties
1. Used in complex polar liquids, such as epoxy resin, polyurethane, vinyl resin, with good thickening and thixotropic effect;
2. Used as thickening, thixotropic agent, anti-settling and anti-sagging in seamstress and cable adhesive;
3. Anti-settling agent for high-density filler;
4. Used in toner for loosening and anti-caking;
5. Used in paints to improve storage stability;
6. Excellent defoaming effect in defoamer;
Product Specifications
| Serial number | Inspection item | Unit | Inspection standard |
| 1 | Silica content | m/m% | ≥99.8 |
| 2 | Specific surface area | m2/g | 80 – 120 |
| 3 | loss on drying105℃ | m/m% | ≤1.5 |
| 4 | loss on ignition1000℃ | m/m% | ≤2.5 |
| 5 | PH of suspension(4%) |
4.5 – 7.0 | |
| 6 | Apparent density | g/l | 30 – 60 |
| 7 | Carbon content | m/m% | 3.5 – 5.5 |
Product Application
Widely used in coatings, adhesives, sealants, photocopying toner, epoxy and vinyl resins and gelcoat resins, cable glue, seamstresses, defoamers and other industries;
Packaging and Storage
1. Packaged in multiple layer kraft paper
2. 10kg bags on pallet
3. Should be stored in the original packaging in dry
4. Protected from volatile substance
