Premium Hydrophobic Fumed Silica Manufacturer
Advanced Surface Modification Technology | Direct Factory Pricing | 100% Batch Consistency for Coatings, Клеї & Defoamers.
Hydrophobic Silica
Hydrophobic silica, also known as surface-treated fumed silica, is a functional powder obtained through organic silicon surface grafting treatment of hydrophilic fumed silica.
This hydrophobically modified nano silica is safe and efficient.
It is an ideal choice for high-end industrial formulations.
Our hydrophobic silica uses specific surface treatment agents such as DDS, HMDS, or silicone oil to replace hydrophilic silanol groups (-Si-OH) on the surface with hydrophobic organic groups.
This gives the material characteristics such as moisture resistance, easy dispersion in non-polar systems, and precise rheology control.
KosNature hydrophobic silica provides more complete surface coverage and higher hydrophobic efficiency.
100% free from heavy metal impurities.
Complies with international regulations .
Suitable for various high-end industrial applications.
Your Trusted Silica Manufacturer of Hydrophobic Silica in China – KosNature
KosNature hydrophobic silica is a high-performance functional additive used in industries such as coatings, Клеї, sealants, and industrial defoamers.
We manufacture in strict accordance with international standards such as ISO 9001 .
These hydrophobic fumed silica products are suitable for solvent-based coatings, inks, Клеї, sealants, industrial defoamers, powder coatings, and composite materials.
Our team can provide a range of hydrophobic silica grades according to your formulation requirements.
These include DDS-treated fumed silica, HMDS-treated fumed silica, and silicone oil treated fumed silica.
We are committed to producing hydrophobic silica derived from natural mineral sources.
All products are selected from high purity silica quartz raw materials.
They are manufactured through strict and precise surface chemical modification processes.
We believe they can provide satisfactory rheology modifier performance and formulation stability.
Please contact us for more information.
Технічні характеристики
| Пункт | Test Standard | Typical Range |
| Specific Surface Area (BET) | ISO 9277 | 110–200 m²/g |
| Carbon Content (DDS Treated) | Internal Method | 0.6%–1.2% |
| Carbon Content (Silicone Oil Treated) | Internal Method | 3.5%–5.0% |
| pH Value (4% Water Dispersion) | ISO 787-9 | 3.5–7.5 |
| Втрати при висиханні (105°C, 2h) | ISO 787-2 | ≤0,5% |
| Tapped Density | ISO 787-11 | 40–80 g/L |
| SiO₂ Content | Internal Method | ≥99,5% |
| Важкі метали (Pb, як, Рт.ст.) | ICP-OES | Complies with REACH Limits |
| Crystalline Silica | XRD | Not Detected |
Hydrophobic Silica Improves Formulation Performance
Hydrophobic silica can build a three-dimensional hydrogen bonding network in solvent-based systems.
It can also help prevent pigment settling under static conditions.
It allows shear thinning during application.
After application, the thixotropic structure recovers immediately.
This helps prevent sagging.
Hydrophobic silica provides excellent anti-sagging performance and storage stability for adhesives and sealants.
Hydrophobic silica acts as a solid penetrating particle in industrial defoamers.
It can significantly improve foam breaking efficiency and foam suppression performance.
Hydrophobic silica can also be used as a free flow agent for powder coatings and dry powder systems.
It helps prevent moisture absorption and caking.
Benefits of Our Hydrophobic Silica
Provides excellent hydrophobicity and moisture resistance
Provides excellent thixotropy and anti-sagging agent performance
Provides stable thickening and anti-settling agent performance in oil-based and non-polar media
Advantages of KosNature Hydrophobic Silica
Carbon content variation between batches is less than 5%, helping ensure stable and reliable formulations.
High hydrophobic efficiency with moisture content below 0.5%.
Suitable for highly moisture-sensitive polyurethane systems.
Multiple modification technology platforms are available:
DDS treatment (equivalent application level to Aerosil R972 and Cab-O-Sil TS-610)
PDMS silicone oil treatment (equivalent application level to Aerosil R202 and Cab-O-Sil TS-720)
HMDS treatment (equivalent application level to Aerosil R812 and R812S)
Specific surface area range from 110–200 m²/g.
Suitable for different thickening and thixotropic requirements.
Vacuum packaging options are available.
This can help customers reduce ocean freight container costs by 30%–50%.
100% amorphous silica structure.
Contains no crystalline silica.
Complies with food contact and industrial safety requirements.
Documentation support available, including MSDS, TDS, and COA.
Упаковка
10–20 kg per bag
Inner packaging: polyethylene bag
Outer packaging: woven bags or kraft paper bags
Custom packaging available upon request
Loading Capacity
Advantages of KosNature Silica
Non-GMO is not applicable (industrial mineral source)
Easy dispersion and low odor
High purity silica (SiO₂ content ≥99.5%)
Documentation and Support
We can provide COA, TDS, SDS / MSDS, and samples to support your R&D, procurement, and quality evaluation process.
As a reliable silica supplier and silica manufacturer, we ensure stable quality and professional bulk silica supply for your business.
Applications of Hydrophobic Silica
Coatings, Фарби, and printing inks: used in solvent-based coatings, wood coatings, automotive coatings, and inks for matting, anti-settling, anti-sagging, and scratch resistance.
Adhesives and sealants: used in silicone sealants, polyurethane adhesives, and epoxy resin systems for rheology modification, Потовщення, anti-sagging, and crack resistance.
Industrial defoamers: used in silicone oil defoamer systems as solid penetrating particles to improve foam breaking and foam suppression performance.
Powder flow and anti-caking applications: used in dry powder fire extinguishing agents, powder coatings, feed additives, and premixes as a free flow agent and anti-caking agent.
Composite materials: used in unsaturated polyester and epoxy composite systems for thickening and reinforcement.
Electronics and new energy applications: used in electronic potting compounds and lithium battery cathode materials for moisture removal and rheology control.
Benefits of KosNature Hydrophobic Silica for Industrial Formulations
Reduce moisture absorption risk.
Hydrophobic silica can effectively protect moisture-sensitive systems such as polyurethane sealants from container swelling or performance degradation during storage.
Reduce UV and moisture aging.
Hydrophobic silica provides excellent weather resistance and moisture resistance.
It helps protect the long-term stability of coatings and adhesives in outdoor environments.
Provide long-term rheology stability.
After more than six months of storage, formulation viscosity shows no significant decline.
This helps avoid secondary reactions caused by incomplete surface modification.
Reduce formulation settling and cracking.
It helps coatings and adhesives remain uniform during vertical application.
It helps prevent sagging and cracking.
Improve dispersion efficiency.
Precise particle size control and surface modification levels help ensure rapid dispersion in resin systems.
This helps reduce grinding time and energy consumption.
Promote free flow performance in powder systems.
It provides excellent anti-caking and free-flowing performance for dry powder fire extinguishing agents, powder coatings, and premixes.
Enhance mechanical properties.
In composite materials and sealants, hydrophobic silica can improve tensile strength and tear strength.
Meet high transparency requirements.
High purity HMDS-treated hydrophobic silica comparable to R812S has minimal impact on formulation transparency.It is suitable for high-end optical coatings and electronic adhesives.
Choosing the Right Silica for Your Application
Silica: FAQ Guide
Так, hydrophobic silica is White Carbon Black that has undergone “hydrophobic modification treatment.”
The relationship between them is that of “raw material” vs. “modified finished product.” Here’s how you can understand their differences:
White Carbon Black (Hydrophilic Silica): It is hydrophilic. Its surface is covered with a large number of silanol groups (–Si–OH), making it highly absorbent to water and unable to disperse uniformly in oil-based systems.
Hydrophobic Silica: It is hydrophobic. Using White Carbon Black as the raw material, chemical modifiers (such as silicone oil, hexamethyldisilazane, etc.) replace the surface silanol groups. This makes it insoluble in water and perfectly compatible with oil-based resins.
Так. Our KN-R972 is a 1:1 seamless alternative specifically developed for R972 and TS-610.
Why you can switch with confidence:
| Parameter | Evonik R972 / Cabot TS-610 | KosNature KN-R972 |
|---|---|---|
| Modifier | DDS (Dimethyldichlorosilane) | DDS (same) |
| BET surface area | 110 ± 20 m²/g | 110 ± 20 m²/g |
| Carbon content | 0.6% – 1.2% | 0.6% – 1.2% |
| pH value | 3.5 – 5.5 | 3.5 – 5.5 |
| Втрати при висиханні | < 0.5% | < 0.5% |
| Tamped density | ~50 g/L | ~50 g/L |
Our recommended switching process:
Request a free sample (1–2 kg)
Run lab tests in your own formulation — test viscosity, thixotropy, anti-sagging
Compare data — we provide full TDS and batch COA
Place bulk order only after confirming zero formulation drift
What you gain:
25-40% reduction in raw material cost
Stable supply — no more allocation limits or indefinite delays from major global producers
Так. We recommend starting with small sample testing.
After validation, you can proceed to trial orders or bulk purchasing of bulk silica.
This approach helps reduce your trial and error cost.
Так. These documents support your internal quality control and evaluation by R&D and procurement teams.
If you have specific testing requirements, you can inform us in advance.
Looking for Reliable Alternatives to Big Brands?
Our hydrophobic grades are engineered to seamlessly replace global standard models with matching physical properties at competitive factory prices.