Hydrophilic Fumed Silica | Fumed Silica Reinforcing & Thickening Additive for Coating, Epoxy, Ink
Meta Description
Hydrophilic fumed silica (amorphous silicon dioxide) is a high-performance thickening, anti-settling and reinforcing filler.
Widely used in water-based coatings, epoxy resin, water-based ink, adhesive, cosmetics. Good dispersibility, high specific surface area.
Hydrophilic Fumed Silica
Product Definition
Hydrophilic fumed silica is amorphous nano silicon dioxide produced by high-temperature hydrolysis of silicon tetrachloride in flame.
It is unmodified fumed silica with abundant silanol groups on the surface. It can be wetted and dispersed in water,
polar solvents and polar resin systems, widely used as functional additive for thickening, thixotropy, anti-settling and reinforcement.
Key Features
- Nano primary particle size, high specific surface area
- Abundant surface silanol groups, good hydrophilicity
- Excellent thixotropic property
- High purity, low heavy metal content
- Good transparency after dispersion
- Easy to disperse in polar & aqueous systems
Advantages
✅ Effective thickening & thixotropy, prevent sagging on vertical surface
✅ Anti-settling, keep pigment and filler suspended stably
✅ Improve scratch resistance, hardness and tensile strength of finished products
✅ Low addition amount, little influence on system transparency
✅ Good compatibility with water-based resin, epoxy, polar adhesives
✅ High chemical inertness, acid & alkali resistant
Applications & Usage
- Water-based coatings, water-based paints, water-based varnish
- Epoxy resin, water-based epoxy adhesive
- Water-based ink, water-based pigment paste
- Water-based glue, PU aqueous adhesive
- Cosmetic, personal care products
- Battery material, catalyst carrier
- Agriculture, anti-caking agent
Specification
| Item | Standard Parameter |
|---|---|
| Model | A200 |
| Specific Surface Area | 200±25 m²/g |
| SiO₂ Content | ≥99.8% |
| Loss on Drying | ≤1.5% |
| pH Value (4% water dispersion) | 3.6~4.5 |
| Tamped Density | 40~60 g/L |
| Particle Size | Nano grade |
Recommended Addition Ratio
Based on the total weight of the whole formula
- Water-based coating / water paint: 0.5% – 2.0%
- Epoxy resin system: 0.8% – 2.5%
- Water-based ink & color paste: 1.0% – 3.0%
- Water-based adhesive: 0.6% – 2.0%
- Cosmetic formulation: 0.2% – 1.0%
Instructions for Use
- This hydrophilic fumed silica needs high shear dispersion, simple stirring cannot achieve good dispersion effect.
- Add silica powder slowly into resin / solvent under high-speed dispersion machine (dispersion speed: 2000–6000 rpm).
- Disperse for 5–15 minutes until no visible agglomerates.
- Suggest adding in the early stage of grinding & dispersion process.
- Do not add together with other high filler at one time, to avoid agglomeration.
- Storage: Keep sealed, store in dry & cool place, avoid moisture absorption. Once absorbing water, thickening efficiency will drop obviously.
Packaging
- 10kg / bag, 15kg / bag, 20kg / bag, multi-layer kraft paper bag with PE inner liner
- Custom package available upon request
- Hi, Winstar Silicone company, we are interested in your product silicone color masterbatch, could you please offer some free samples to us？ Our company address: ***LA,USA
- Hello Winstar, our product is compression molding product,could you advise which peroxide curing agent to use ?
- Hi friend, we have some problem in silicone to PVC bonding, that bonding strength is not well at all, how to improve it please ?
