SemiSIL 200: Hydrophilic fumed silica 200
SemiSIL 200 is a premium technical alternative to leading fumed silica 200 grades. As a factory-direct source, we provide superior molecular stability for coatings, sealants, and resins. As a leading high-performance hydrophilic fumed silica 200, SemiSIL 200 ensures long-term shelf stability.
Quick Profile
- Surface Area (BET): 200 ± 25 m²/g
- Composition: SiO₂ ≥ 99.8%
- CAS Number: 112945-52-5
Industries & Applications of Hydrophilic Fumed Silica 200
- Coatings & Paints: Anti-sagging and rheology control.
- Silicone Rubber: Reinforcing filler for high tensile strength.
- Adhesives & Sealants: Thixotropy and anti-bead collapse.
- Powder Handling: Anti-caking and free-flow improvement.
Key Functional Properties
Thixotropy & Thickening
Creates a robust gel structure that breaks down under shear for improved viscosity.
Anti-Settling
Prevents sedimentation of pigments and fillers during long-term storage.
Reinforcement
Significantly enhances tensile strength and elongation in silicone rubber.
Thermal Insulation
Provides excellent high-temperature insulation and powder flowability.
Chemical Integrity
SiO2 ≥ 99.8%: non-toxic, odourless, and stable for sensitive industrial applications.
Technical Data (TDS)
| Property | Standard Value | Unit | Method |
|---|---|---|---|
| Specific Surface Area | 200 ± 25 | m²/g | GB/T 20020 |
| pH (4% dispersion) | 3.6 ~ 4.5 | - | GB/T 20020 |
| Loss on Drying | ≤ 1.5 | % | GB/T 20020 |
| SiO₂ Content | ≥ 99.8 | % | GB/T 20020 |
Packaging & Logistics
Non-DG Compliance: Fully safe for Railway, Sea (Shipping), and Truck transportation.
20‘FCL Loading
• 180kg / pallet (18 bags)
• 10 pallets / 1800kg total
• 10 pallets / 1800kg total
40‘HQ Loading
• 220kg / pallet (22 bags)
• 20 pallets / 4400kg total
• 20 pallets / 4400kg total
Maximal 40‘HQ Combined Loading
• 4400kg Palletized (220kg x 20 pallets)
• 400kg Loose bags without pallets
• 4800kg Total Loading Capacity
• 400kg Loose bags without pallets
• 4800kg Total Loading Capacity
Common Questions
Is SemiSIL 200 a direct drop-in replacement for Aerosil® 200 or CAB-O-SIL® M-5?
Yes. SemiSIL 200 is a 1:1 technical equivalent to leading hydrophilic fumed silica 200 grades. It shares the identical CAS Number (112945-52-5), a 200 m²/g BET surface area, and ≥ 99.8% SiO2 purity. Formulators can confidently transition to SemiSIL 200 to reduce costs without altering existing milling or dispersion protocols.
What is the recommended addition rate of SemiSIL 200 for rheology control?
For general liquid systems such as Unsaturated Polyester Resin (UPR), coatings, and standard adhesives, the typical dosage ranges from 0.5% to 2.0% by weight. For silicone rubber reinforcement, loadings can range from 10% to 30%. We recommend starting at the lower end and scaling up based on your required thixotropic index.
How do I properly disperse SemiSIL 200 to achieve maximum thickening efficiency?
Because fumed silica builds viscosity by forming a 3D hydrogen-bonded network, high-shear dispersion is critical. We recommend using a high-speed dissolver (e.g., Cowles blade), rotor-stator system, or a three-roll mill. Simple low-shear stirring will leave agglomerates intact, resulting in poor anti-sagging performance and surface defects.
Will SemiSIL 200 lose its thixotropy over time in polar systems like epoxy resins?
In highly polar systems (like certain epoxies or polyurethanes), hydrophilic fumed silica can experience a slight viscosity drop over time, known as the "aging effect." If long-term shelf stability in polar adhesives is your primary goal, we highly recommend switching to our silicone oil-treated hydrophobic grade, SemiSIL R202.
How does moisture affect SemiSIL 200, and what is its shelf life?
As a highly hydrophilic material, SemiSIL 200 readily absorbs moisture from the air, which can physically hinder its ability to form hydrogen bonds and reduce thickening efficiency. It must be stored in its original, tightly sealed multi-layer kraft paper bags in a dry, well-ventilated warehouse. Under proper conditions, its shelf life is 24 months from the date of manufacture.
Factory-Direct fumed silica 200
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