Overview
HJSIL R272 is a hydrophobic fumed silica treated with DDS (dimethyldichlorosilane), supplied as a high-purity white colloidal powder with a BET surface area of 110 ± 20 m²/g. Its hydrophobic surface makes it suitable for moisture-sensitive formulations including RTV silicone rubber, sealants, coatings, cable compounds, cosmetics, and food/pharmaceutical applications.
Technical Specifications
| Property | Unit | Value | Standard |
|---|---|---|---|
| Specific surface area (BET) | m²/g | 110 ± 20 | GB/T20020 |
| pH value (4% dispersion) | — | 3.8–5.0 | GB/T20020 |
| Loss on drying (105°C, 2 hrs) | Wt% | ≤0.5 | GB/T20020 |
| Loss on ignition (1000°C, 2 hrs) | Wt% | ≤2.0 | GB/T20020 |
| Silica content | Wt% | ≥99.8 | GB/T20020 |
| Tamped density | g/L | 40–60 | GB/T20020 |
| Carbon content | Wt% | 0.6–1.2 | GB/T20020 |
| Surface treatment | — | DDS (dimethyldichlorosilane) | — |
| Appearance | — | Lightweight, fluffy white powder | — |
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Applications
- RTV silicone rubber
- RTV-1 and RTV-2 sealants and adhesives
- Paints and coatings
- Printing inks and toners
- Powder coatings
- Cable compounds and gels
- Water-repellent exterior paints
- Cosmetics and personal care products
- Plastics and polymers
- Food and pharmaceutical anti-caking agent
- Lubricants
- Electronics encapsulants
- Oil and gas drilling fluids
Packaging & Storage
Supplied in 10 kg kraft paper bags. Store in closed containers under dry conditions and protect from volatile substances.
Lead time: 10 days.
Related Products
- HJSIL® Fumed Silica
- HJSIL R110 — PDMS-treated hydrophobic fumed silica, 100 m²/g BET
- HJSIL R274 — DDS-treated hydrophobic fumed silica, 170 m²/g BET
- HJSIL R620 — HMDS-treated hydrophobic fumed silica, 190 m²/g BET
- HJSIL R622 — HMDS-treated hydrophobic fumed silica, 260 m²/g BET
Next step
Request a quote, COA, or sample
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