Hubei Huifu Nanomaterials Co., Ltd. is a Chinese nanomaterial chemical manufacturer. With a global footprint, our fumed silica products are consistently chosen to tackle some of the world’s most demanding performance challenges. HIFULL’s main products are hydrophilic fumed silica (7 specifications), hydrophobic fumed silica (10 specifications) and food-grade fumed silica (2 specifications). We have over 20 years of expertise, Furthermore, in our commitment to cater to the escalating global demand, Our annual capacity is 20,000 tons, and another 25,000 tons is in construction

Fumed Silica

Fumed silica, or pyrogenic silicon dioxide, is one kind of pure amorphous white inorganic powder that has a high specific surface area, nano-scale primary particle size, and a relatively high (among silica products) concentration of surface silanol groups. The properties of fumed silica can be chemically modified by reaction with these silanol groups.

Synonyms: Pyrogenic silica, Fumed Silica Dispersion, Silicon Dioxide, Fumed SiO2

Chemical Formula: SiO2

CAS Number: 112945-52-5

Common functions

  • Reinforcement,
  • Transparency
  • Rheology Control
  • Thickening & Thixotropy
  • Anti-sagging
  • Anti-settling
  • Anti-caking, Flow aid
  • Anti-adhesion
  • Thermal insulation
  • Toughening
  • Anti-slip
  • Defoaming
  • Matting
  • Catalyst carrier, etc.

HIFULL® Hydrophilic fumed silica

Hydrophilic fumed silica is a silica-based polymer with a tendency to absorb moisture. It is used in high-technology fields or as an ingredient in the paints, coatings, electronics, and optical fibers industries.


  • Particle Size – Primary: 7-20nm
  • Aggregates (average):150-300nm
  • Agglomerates(average ): 1-50um
  • Specific surface area (BET): 90-400 m2/g
  • Tamped density: 40-120 g/l
  • pH in 4% dispersion: 3.7-4.5
  • Purity: SiO2 Content > 99.8%
  • Sieve residue (45um): < 0.025%
  • Loss on drying: < 0.5-1.5% @ 105℃/2h
  • Loss on ignition: < 1% @1000℃/2h
  • Crystal structure: amorphous
  • Refractive index: 1.46
  • Specific gravity: 2.2g/cm3
GradeSpecific Surface Area (nitrogen adsorption method) (m²/g)pH Value in DispersionLoss at 105℃ (%)Loss on Ignition (%)Sieve  Residue (45μm) (mg/kg)Silica Content (%)Tamped Density (g/L)

HIFULL® Hydrophobic Fumed Silica

Hydrophobic fumed silica is a form of silicon dioxide (commonly known as silica) that has hydrophobic groups chemically bonded to the surface. It’s treated silica or structure-modified silica. HIFULL hydrophobic fumed silica is structure-modified silica after being treated by HMDS(Hexamethyldisilazane), PDMS(Polydimethylsiloxane) and DDS(Dimethyldichlorosilane).


  • Particle Size: a little bit bigger than the relative hydrophilic item
  • Specific surface area (BET): 90-400 m2/g
  • Tamped density: 40-120 g/l
  • pH in 4% dispersion: 3.0-10
  • Carbon Content: 0.5%-6%
  • Sieve residue (45um): < 0.025%
  • Loss on drying: < 0.1-1.5% @ 105℃/2h
  • Loss on ignition: < 1% @1000℃/2h
  • Crystal structure: amorphous
  • Refractive index: 1.45-1.46
  • Specific gravity: 2.2g/cm3
GradeTreating AgentSpecific Surface Area (nitrogen adsorption method) (m²/g)pH Value in DispersionLoss on Drying(2 hour at 105℃)Loss on Ignition (%)Silica Content (%)Carbon Content(%)Tamped Density (g/L)
HB-202NSpecial Silane Treated170±208.0~10.0≤2.0≤8.0≥99.81.0~2.040~60
HB-701Special Silane Treated150±254.0~6.0≤1.5≥4.5≥99.84.5~6.540~60

Check Our Certificate and patents

We supply total of 23 grades of hydrophilic & hydrophobic fumed silica. We get registration of REACH and pre-registration of K-REACH. We are the leading setting body of ISO18473-1:2015ISO18473-3:2018, and ISO 23157:2021. In the list, you can view our relevant certificate details and international patents.

ISO 9001 is the most well-developed quality framework in the world to date, with over 750,000 organizations in more than 161 countries/regions worldwide using it. Companies certified ISO9001 achieve international standards in various management systems, indicating the ability to consistently and stably provide customers with expected quality products.

Through environmental management system certification, it can be confirmed that this company is complied with environmental protection standards and regulations in raw materials, manufacturing process, processing methods, as well as the use and disposal.

ISO 45001 provides a framework for managing occupational health and safety risks and opportunities. The purpose and expected outcome of ISO 45001 is to prevent work-related injuries and health issues for employees and to provide a safe and healthy workplace.

An Energy Management System is a system that focuses on controlling and managing “energy” as its core element. Organizations achieve this by identifying energy factors, setting specific energy goals and objectives, and establishing an energy management system to reduce energy consumption and enhance energy efficiency.

The full name of REACH is the Registration, Evaluation, Authorization, and Restriction of Chemicals. It is a regulation aimed at ensuring the safe entry of chemicals into the European Union market and their safe use. HIFULL fumed silica has obtained a REACH certificate, indicating that this substance is considered safe for use in accordance with REACH regulations. We also get pre-registered UK-REACH, K-REACH and KKDIK.

The Turkey REACH like-law: KKDIK is closely harmonized with the EU REACH provisions and requires companies to pre-register and register substances (on their own, in mixtures or in articles) manufactured in Turkey or imported into Turkey with volumes equal to or above 1 ton per year. Our product HIFULL fumed silica gets the official approval.

The silica dioxide (silicon dioxide) product produced by Hubei Huifu Nanomaterials Co., Ltd. has passed SGS testing. According to the specified scope and evaluation criteria, the SVHC (Substances of Very High Concern) test results for the submitted samples are ≤0.1% (w/w), indicating that the product meets the relevant regulatory requirements regarding SVHC content.

HALAL Foundation Center after examining, inspecting/auditing the ingredients has declared the under-mentioned product fumed silica as halal.

The fumed silica product manufactured by Hubei Huifu Nanomaterial Co., Ltd. is certificated kosher and under supervision.

Our DMF registers No. 035721. Drug Master File (DMF) is a document containing complete information on an Active Pharmaceutical Ingredient (API). In the United States, DMFs are submitted to the Food and Drug Administration (FDA). The document provides the regulatory authority with confidential, detailed information about facilities, processes, or articles used in manufacturing, processing, packaging, and storing.

ISO/TC256 is mainly responsible for standards in coloring materials such as pigments, dyes and extenders. Doctor Wang is also chairman of Hubei Huifu Nanomaterial Co., Ltd.

Guangzhou Huifu Research Institute Co., Ltd. Analysis and Testing Center is officially certified the laboratory accreditation certificate from China National Accreditation Service for Conformity Assessment (CNAS). Certificate number is CNASL15158.

Hubei Huifu is certified as a specialized, Fined, Peculiar, and Innovative Little Giant Enterprise by the Ministry of Industry and Information Technology of the People’s Republic of China.

“Little Giants” include those specializing in new technologies, including “small but strong” and “small but superb”, endeavors with strong innovative abilities throughout science and technology, high market share, and top-notch quality and efficiency combined.

Hubei Huifu is certificated as China National Green Factory by the Ministry of Industry and Information Technology. It is a factory that achieves “intensive land use, harmless raw materials, clean production, waste recycling, and low-carbon energy”.

Vice President of China Association of Fluorine and Silicon Industry (CAFSI)

Founded in 1988, the China Fluorine Silicon Association is the National Association of Industrial Associations and is the only national organization in China. Hubei Huifu Nano Material Co., Ltd. is the vice president member of CAFSI.

We are qualified as a National High-tech Enterprise in China, and Hubei Huifu Nanomaterial Co., Ltd. has continuously carried out research and development of technological achievements, we get our own core independent intellectual property rights and carried out business activities based on those advanced technology.

We are awarded as Manufacturing Individual Champion Enterprise in Hubei Province by Hubei Provincial Department of Economy and Information Technology. This single product is fumed silica/pyrogenic silica.

We get a total of 54 patents, including 26 invention patents (2 of them are international patents) and 28 utility model patents.

International Patents


  • US Patent No. US9273905 B2 
  • EU Patent No. 2796194


Germany Patent No. DE325386170

We completed the formulation or revision of eight standards, including three international standards, two Chinese national standards and three group standards.

ISO Standards

  • ISO18473-3: 2018 Fumed silica for silicone rubber application
  • ISO23157: 2021 Determination of the silanol group content on the surface of fumed silica – Reaction gas chromatographic method
  • ISO18473-4: 2022 Nanoscale titanium dioxide for photocatalytic application  

China national standards 

  • GB/T26824-2020 Nanoscale Alumina              
  • GB/T41948-2022 Particle characterization — Sample preparation

Group standards 

  • T/FSI003-2016 Silicon Tetrachloride for Production of Fumed Silica         
  • T/FSI 049-2020 Determination of Silanol Content on the Surface of Fumed Silica
  • T/FSI078:2022   Fumed Silica for Silicone Rubber

Resource Center

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Frequently Asked Question

A Manufacturer. Hubei Huifu has been researching and manufacturing fumed silica for 20+ years. We are the largest manufacturer of fumed silica with a well-developed and stable manufacturing process in China.
We get registration of REACH and pre-registration of K-REACH & KKDIK. We get certificates of ISO 9001, ISO 14001. We are the leading setting body of ISO18473-1:2015, ISO18473-3:2018 and ISO 23157:2021.

  • Manufacturer: Leading fumed silica manufacturer in China with 20+ years of expertise, 12,000 tons annual capacity 
  • Registration & Certificate: REACH, K-REACH, KKDIK, ISO9001, HALAL, KOSHER
  • Manufacturer Direct Supply: 23 grades of hydrophilic; hydrophobic fumed silica supplied, good quality, competitive price
  • International Standard: Leading setting body of ISO18473-3-2018 Fumed silica for silicone rubber application; Member of the setting body of ISO18473-1-2015 Nanoscale calcium carbonate for sealant application
  • Technology Expertise: 50+ technology patents experienced R&D team from top universities of China Project 211 & Project 985 

Free Sample: All grades of fumed silica sample available, Contact to Us

Pyrohydrolysi & Trichloromethylsilane

Fumed silica is synthesized by the pyrohydrolysis of silicon tetrachloride or trichloromethylsilane in the flame of hydrogen and oxygen. Our main raw material is silicon tetrachloride, and the secondary is trichloromethylsilane.

Hydrophilic Fumed Silica SiO2:

HL-150 / HL-200 / HL-300 / HL-380 / HL-150W / HL-200W

Hydrophobic Fumed Silica SiO2:

DDS Treated — HB-151/ HB-152 ;
PDMS Treated — HB-139 ;
HMDS Treated — HB-132 / HB-135 / HB-612/ HB-615 / HB-620 / HB-630.

Fumed Titanium Dioxide TiO2: NT-50

Fumed Aluminium Oxide Al2O3: Aluna-80 & Aluna-100

Price is based on the actual grade.

When the price of raw material fluctuates, we may adjust the price accordingly, please enquire before placing orders. Our email: Cell : + 8618571019514

When fumed silica is used as filler or additives, it helps in thickening, reinforcement, transparency, free-flow, thixotropic performance, dielectric properties, anti-settling, heat insulation, and anti-sagging. For example, for powder products, HIFULL fumed silica is used as an anti-caking agent; for liquid products, HIFULL fumed silica is used as an anti-settling agent or suspending agent.

ApplicationsFunctionsRecommended Dosage
Paints & Coatingsrheology & thixotropic control,anti-sagging,anti-settling0.5-2%
UPR, Gel Coatrheology & thixotropic control,,anti-sagging,anti-settling0.5-2%
HTV Silicone Rubberreinforcement15-30%
RTV Silicone Rubberthickening & reinforcing10-20%
Adhesivesrheology & thixotropic control, anti-sagging,anti-settling2-10%
Cable Gelthickening5-10%
Gel Batterythickening0.5-6%
Industrial Powdersanti-caking0.5-1%

Quality Stabilization: we are the earliest fumed silica manufacturers with independent R&D in China, which guarantees our product stabilization.

Largest Manufacturer: Our annual output of fumed silica is about 12,000 tons.

Strong R&D Team: Besides our own R&D institute and application& technology department, we’ve to build a research center with Sichuan University and Wuhan University, both are top-tier universities in China.

Leading Authority: We have already been the influential enterprise in the silicon industry in China. Doctor Wang Yuelin, the actual controller of Hifull, is the leader of the Sino-Germany project ISO18473-3 << Fumed Silica for Silicon Rubber>> and he is granted the Outstanding Contribution Award by the committee.

Mainly T/T, L/C and D/P, actual payment terms please check with sales when placing orders.

We will arrange delivery immediately according to the manufacturing schedule and conditions. Due to shipping schedule or other factors, please check with sales when placing orders.

Still have questions?

If you cannot find an answer to your question in our FAQ, you can always contact us and we will be with you shortly.

Contact Support

Hello, Customers

My name is Van, I’m the business manager of HIFULL, I have been in Fumed Silica Industry for more than 10 years. Feel free to contact me. I’m happy to provide you the best service and products.
Business Manager