Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

HIFULL HB-630 Hydrophobic Fumed Silica

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.

Features Of HIFULL HB-630 Hydrophobic Fumed Silica

  1. High specific surface area – 400m²/g, nano particle size, excellent dispersion and reinforcement

  2. Ultra-high hydrophobic stability – HMDS coated, hydrolysis & moisture resistance, long shelf life

  3. High transparency – no yellowing, suitable for transparent silicone products

  4. Stable thixotropy – anti-sagging & anti-sedimentation, improve coating flatness

  5. Powder flow aid – anti-caking, better processing and storage

Typical Applications Of HIFULL HB-630 Hydrophobic Fumed Silica

  1. High-end silicone rubber (HTV/LSR) – reinforce strength, toughness and transparency

  2. Industrial coatings & inks – thixotropic & anti-sedimentation, better film performance

  3. Defoamer systems – strong hydrophobicity, high defoaming efficiency

  4. Toner & powder coatings – flow aid & anti-caking, improve quality

  5. Adhesives & sealants – optimize rheology, enhance bonding & sealing

Specifications Of HIFULL HB-630 Hydrophobic Fumed Silica

AppearanceWhite fluffy powder
ModifierHMDS (Hexamethyldisilazane)
SiO₂ Content≥99.8%
BET Surface Area380 ± 40 m²/g
Loss on Drying≤0.7%
Tap Density30–50 g/L
Primary Particle Size7–11 nm
pH Value6.0–9.0
CAS No.68909-20-6 / 112945-52-5



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