Name: SemiSIL® Fumed Silica Series
Brand: SEMITECH
Availability: InStock

Technical Grade Selection Matrix

Select the optimal hydrophilic or hydrophobic grade based on your resin system’s polarity and viscosity requirements.

Grade / Model	Surface Property	BET Area (m²/g)	Carbon Content	Recommended Application
SEMISIL 150	Hydrophilic	150 ± 20	—	RTV Silicone Rubber, Coatings, PVC
SEMISIL 200	Hydrophilic	200 ± 20	—	RTV Silicone, Adhesives, Paints
SEMISIL 300	Hydrophilic	300 ± 20	—	HTV Silicone Rubber, Defoamers, Resins
SEMISIL 380	Hydrophilic	380 ± 20	—	LSR, Gel Coats, Specialty Greases
SEMISIL R110	Hydrophobic	100 ± 20	3.5 – 5.5%	Moisture-sensitive RTV, Advanced Coatings
SEMISIL R272	Hydrophobic	110 ± 20	0.6 – 1.2%	Printing Inks, Industrial Adhesives
SEMISIL R620	Hydrophobic	260 ± 30	2.8 – 4.0%	Liquid Coatings, Pharmaceutical Excipients

Industrial Applications

High-performance rheology and mechanical reinforcement across four core industries.

Controller Rheology Modifier

Coatings & Paints

Optimizing surface integrity, adhesion, and suspension stability for high-performance coating systems.

Rheological Precision: Prevents pigment settling and phase separation.
Anti-Sagging: Eliminates paint runoff on vertical surfaces.
Surface Fortification: Enhances scratch resistance and weatherability.
Adhesion Promotion: Strengthens bonding between films and substrates.

Reinforcer Mechanical Support

Silicone Rubber (HTV / LSR)

Enhancing structural integrity and thermal stability via advanced 3D silica networking.

Molecular Networking: Si-OH groups bond with macromolecules for 3D reinforcement.
Mechanical Boost: Increases base rubber strength up to 40× (tensile / tear).
Dynamic Resilience: Improves hardness while maintaining elasticity.
Thermal Protection: Bolsters heat resistance and dielectric properties.

Modifier Dispersion

Printing Inks

Optimises rheology and drying speed for precise imaging on high-speed substrates.

Optical Enhancement: Maximises brightness and colour density.
Dispersion Stability: Controls anti-settling for long storage life.
Precision Rheology: Ensures sharp contours and streak-free flow.

Glidant Medical Grade

Pharmaceuticals

Enhances solid-dosage consistency and liquid formulation stability.

Improved Flowability: Optimises powder flow for precise manufacturing.
Anti-Adherent Action: Prevents tablet sticking and ensures mould release.
Formulation Stability: Stabilises emulsions and suspensions.

Logistics & Loading Specs

Standardised vacuum packaging (10 kg/bag) designed for maximum freight efficiency.

Transport Mode	Pallet Configuration	Total Bags (10 kg)	Total Net Weight
Domestic Truck (17.5 m)	Full Truckload (FTL)	880 Bags	8.8 Tons
20′ Container (Ocean)	10 Pallets (180 kg/pallet)	180 Bags	1.8 Tons
40′ High Cube	20 Pallets (220 kg/pallet)	440 Bags	4.4 Tons
40′ High Cube (Max Vol)	20 Pallets + Loose Bags	480 Bags	4.8 Tons

Global Delivery Lead Times

Port Preparation Time: Ready at Qingdao Port within 3 days.
Total Origin Lead Time: From order confirmation to departure: 3 to 7 days.
SE Asia Vessel Frequency: 3 to 4 departures per week.
EU / Middle East Frequency: 1 departure per week.

Battery Applications

Fumed Silica in Lithium Battery

SEMITECH fumed silica plays two distinct roles in the lithium battery cell — controlling the rheology of separator coating slurries and enabling gel polymer electrolyte formation. Both rely on its hydrogen-bond-driven thixotropic gel behaviour in polar solvents.

Separator Coating Rheology

Fumed silica at 0.5–1.5 wt % controls alumina slurry viscosity and prevents settling during gravure coating.

Electrolyte Gelation & Semi-Solid

Hydrophilic and hydrophobic grades enable gel polymer electrolytes (GPE) and serve as filler for semi-solid battery formulations.

Explore Lithium Battery Materials Hub →

Frequently Asked Questions

How to choose between Hydrophilic and Hydrophobic silica?

Use hydrophilic silica for polar systems and hydrophobic silica for non-polar systems. Hydrophilic grades provide maximum thickening through hydrogen bonding in polar media (like water-borne coatings). Hydrophobic grades (e.g., SEMISIL R620) are surface-treated to contain a carbon content of 0.6–5.5%, making them essential in moisture-sensitive formulations like epoxy or silicone resins to prevent viscosity drift.

What is the optimal dosage for anti-sagging?

Typically 0.5% to 2.0% by total weight. At this concentration, the particles form a stable 3D thixotropic network that counteracts gravity on vertical surfaces.

How much can it increase silicone rubber tensile strength?

Up to 40 times. By utilising grades with a BET surface area of 300 ± 20 m²/g, the Si-OH groups create dense molecular cross-linking with raw silicone macromolecules.

What impact does BET surface area have on dispersion energy?

Higher BET surface area directly increases the required dispersion energy. High surface area grades (e.g., 380 m²/g) require high-shear equipment operating at a peripheral speed of 10–15 m/s to fully develop the rheological network.