Product Description
Fumed Silica (White Carbon Black)
Fumed silica, commonly known as white carbon black, is a highly versatile and important industrial material with unique physical and chemical properties.
1. Production Process
It is typically produced through a vapor - phase hydrolysis method. In this process, silicon tetrachlorid e (SiCl4) is vaporized and then reacted with hydrogen and oxygen in a high - temperature flame. The chemical reaction can be represented as: SiCl4 + 2H2 + O2 → SiO2 + 4HCl. This results in the formation of extremely fine silica particles with a high surface area.
2. Physical Properties
- Particle Size: Fumed silica has an extremely small primary particle size, usually in the range of 7 - 40 nanometers. These tiny particles aggregate to form larger secondary particles, which gives it a very high surface area, often ranging from 50 to 400 m²/g.
- Appearance: It appears as a white, fluffy, and amorphous powder. Its color is similar to that of carbon black, which is why it is called white carbon black, but it has a completely different chemical composition.
- Low Density: It has a low bulk density, typically between 0.04 - 0.2 g/cm³, making it a lightweight material.
3. Chemical Properties
- High Purity: Fumed silica is highly pure, with a silica (SiO2) content often exceeding 99%. It is chemically inert under normal conditions, resistant to most acids (except hydrofluoric aci d) and alkalis.
- Hydrophilicity and Hydrophobicity: There are two main types of fumed silica - hydrophilic and hydrophobic. Hydrophilic fumed silica has hydroxyl groups (-OH) on its surface, which makes it readily dispersible in water - based systems. Hydrophobic fumed silica, on the other hand, has its surface modified with organosilane or other hydrophobic agents. This modification replaces the surface hydroxyl groups with hydrophobic groups, enabling it to disperse well in non - polar organic solvents.
Detailed Photos
Product Parameters
| Item |
Specifications |
Results |
| Property |
Specification |
Compliance Index |
| Appearance |
White powder |
- |
| Specific surface area of nitrogen adsorption (m²/g) |
200 ± 10 |
200 |
| SiO2-content |
> 99.8 |
99.90% |
| pH |
3.7-4.5 |
4.19 |
| Volatile matter % at 105 °C |
≤ 3.0 |
0.82 |
| Tamping density (g/dm³) |
30-60 |
31 |
| Sieve residue (45μm) (mg/kg) |
≤ 250 |
19.93 |
Application
- In the Rubber Industry: It is widely used as a reinforcing filler in rubber products, especially in silicone rubber and high - performance tires. In tires, it can improve the mechanical properties such as tensile strength, tear resistance, and abrasion resistance. It also enhances the wet - skid resistance while maintaining low rolling resistance, which is crucial for fuel efficiency and safety.
- In the Coatings and Paints Industry: Fumed silica acts as a thickening and anti - settling agent. It helps to improve the rheological properties of coatings, preventing pigment settling and ensuring uniform film formation. In addition, it can enhance the scratch resistance and hardness of the coating film.
- In the Adhesives and Sealants Industry: It is used to adjust the viscosity, improve the thixotropy, and enhance the adhesion strength of adhesives and sealants. Hydrophobic fumed silica is particularly useful in moisture - curing silicone sealants, where it helps to prevent premature cross - linking during storage.
- In the Plastics Industry: Fumed silica can be added to plastics to improve their mechanical properties, such as tensile modulus and impact strength. It can also enhance the dimensional stability and heat resistance of plastic products.
Packaging & Shipping
Packaging:
10kg/25kg/50kg bag--27tons/1FCL without pallet
1000kg bag--25tons/1FCL without palletShipping:
We mainly use MSC, Maersk, CMA CGM, COSCO, HPL, ONE, YML, WHL, PIL and ZIM.
Certifications
Company Profile
Shandong Jiuchong Chemical Company Limited was founded in 2016, which is located in Weifang City, Shandong Province, China. We have 228 square meters of office space. Now Jiuchong chemical is a large modern international chemical enterprise with more than 28 series. Since our establishment, the company has gradually established and improved a sound supply chain system, quality monitoring system and service system, ensuring products quality and service.
At the same time, relying on our own geographical location and resource advantages, our company is committed to the optimization of a variety of chemical supply chain, including magnesium chloride, sodium metabisulfite, sodium bicarbonate, calcium chloride, magnesium sulfate, polyaluminium chloride, aluminium sulfate, industrial salt, soda ash etc.
Our products are sold well in 288 domestic cities and more than 36 foreign countries. Now the company has won the praise and trust of domestic and foreign customers. Based on stable quality and output, good team service and staff efforts, we will continue to develop domestic and foreign markets.
Jiuchong chemical takes "integrity, innovation and development" as the concept, puts integrity in the priority position in serving customers, and guarantees high quality products and satisfactory cooperation for customers experience. Your satisfaction is our driving force. Quality is the soul of enterprise and that is what we have always done. In the future, Shandong Jiuchong Chemical Company Limited hopes to build a brilliant tomorrow with you!
FAQ
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