HIFULL HB-630 is a high-specific-surface-area hydrophobic fumed silica modified with HMDS. It features ultra-high hydrophobicity, high transparency, stable thixotropy and efficient reinforcement, designed for high-end silicone rubber, coatings, inks and defoamers.
High specific surface area – 400m²/g, nano particle size, excellent dispersion and reinforcement
Ultra-high hydrophobic stability – HMDS coated, hydrolysis & moisture resistance, long shelf life
High transparency – no yellowing, suitable for transparent silicone products
Stable thixotropy – anti-sagging & anti-sedimentation, improve coating flatness
Powder flow aid – anti-caking, better processing and storage
High-end silicone rubber (HTV/LSR) – reinforce strength, toughness and transparency
Industrial coatings & inks – thixotropic & anti-sedimentation, better film performance
Defoamer systems – strong hydrophobicity, high defoaming efficiency
Toner & powder coatings – flow aid & anti-caking, improve quality
Adhesives & sealants – optimize rheology, enhance bonding & sealing
| Appearance | White fluffy powder |
| Modifier | HMDS (Hexamethyldisilazane) |
| SiO₂ Content | ≥99.8% |
| BET Surface Area | 380 ± 40 m²/g |
| Loss on Drying | ≤0.7% |
| Tap Density | 30–50 g/L |
| Primary Particle Size | 7–11 nm |
| pH Value | 6.0–9.0 |
| CAS No. | 68909-20-6 / 112945-52-5 |
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