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  • Fumed silica is also known as pyrogenic silica because it is produced in flame pyrolysis of silicon tetrachloride or from quartz sand vaporized in a 3000 °C electric arc. Fumed Silica consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles, agglomerating into tertiary particles. The resulting powder has an extremely low bulk density of 2.5-11.8 lbs/ft3 (40–190 kg/m3), a primary particle size of 5–50 nm (smaller than the average p Fumed silica is a universal thickening agent and an anticaking agent (free-flow agent) in powders. Like silica gel, it serves as a desiccant. It is used in cosmetics for its light-diffusing properties. It is used as a light abrasive in products like toothpaste. Other uses include filler in silicone elastomer and viscosity adjustment in paints, coatings, printing inks, adhesives, and unsaturated polyester resins. It is also used in producing cat litter box fillers and as a core material in produc Fumed silica is an artificial substance, so it’s no surprise that it’s known by multiple names—Diatomaceous earth, Diatomaceous silica, Diatomite, Silicon dioxide (amorphous), and Vitreous silica, at least. In fact, before 1989, its official name was silica (amorphous). Today, however, industry and regulators tend to call the substance fumed silica—not to be confused with silica fume, which is an industrial byproduct quite different from fumed silica. Fumed silica is a beneficial industrial chem The benefits of fumed silica and silica fume in the manufacturing and construction industries are well known. While the two terms seem similar, the products have apparent differences. Unfortunately, most people use the terms interchangeably. Here is everything you need to know about fumed silica and silica fume. Fumed silica or pyrogenic silica is a multi-purpose silica-based additive commonly used to manipulate viscosity and rheology and enhance the functionality of existing polymer matrices. I What is Fumed Silica?Fumed Silica is a form of silicon dioxide, or silicon, with the molecular formula SiO2 and a molecular weight of 60.0843 g/mol. Fumed silica is also known as pyrogenic silica. It is an odorless white powder consisting of droplets of fused silica cooled by forming three-dimensional chains. These are organized into particles of amorphous matter of very low apparent density and very high specific surface area. Fumed silica is insoluble in water. Fumed silica (CAS number 112945- The Aerosil® 200 silica used by the invention, with a BET surface area, differs from the known Aerosil® 300, which has a surface area of 300 m2/g, not only in the surface size but also in the average primary particle size. The Aerosil® 300 has an average primary particle size of 7 nm. Based on these differences, these silicas have different performance properties. The fumed silica of the invention contains no hydrophobic fractions. Despite this, the silica of the invention shows no propensity to The prior art can only prevent deagglomeration if the hydrophilic silica is mixed with 3% by weight of hydrophobic silica and if this mixture is ground utilizing an air-jet mill or a pinned-disc mill (EP 0 076 377 B1). In this case, for a fumed silica having a BET surface area of 200 m2/g, even after compaction to 73 or 107 g/l, a goniometer value of 35 is achieved. For a fumed silica with a BET surface area of 300 m2/g, adding hydrophobic silica before grinding produces a goniometer value of 10 A known procedure is to render fumed silica hydrophobic, grind it in a pinned-disc mill, and then classify it (U.S. 2004/0110077 A1). This known silica is used as an external additive in toner mixtures. Reducing the agglomerate size by dispersing outside a liquid system, in other words, in practice, in the air, or by grinding in the conventional sense, is possible only to a limited extent since in the case of material with a given propensity to agglomerate the comminution is followed immediately The primary particles and aggregates of a fumed silica agglomerate form larger assemblies whose size is generally in inverse proportion to the primary particle size or proportion to the specific surface area. The agglomerate size also increases with the extent to which the fumed silica is compacted. The binding forces holding these agglomerates together are relatively weak. Nevertheless, a certain shearing energy is required when these agglomerates are incorporated into and broken down in a liqu Fumed silica having a BET surface area of 200±15 m2/g, a goniometer value of less than 30 μm, and a median value by PCS of 65 to 85 nm are prepared by grinding a fumed silica having a surface area of 200±25 m2/g, and silicone rubber containing this silica. This application is a continuation of Ser. No. 12/095,840 filed Jun. 2, 2008, a U.S. National Stage Filing of international No. PCT/EP2006/068889 filed Nov. 24, 2006, which claims priority from EP 051125334 filed Dec. 20, 2005, which all are b

What does fumed silica do to epoxy

Hydrophobic fumed Silica hinders moisture integration into the epoxy binder system and, in so doing, eliminates one possible source of moisture that can have a negative effect during the curing process of an epoxy coating system—pigmented grout coat over troweled epoxy mortars. Fumed Silica is a light and easily blended thickening agent, ideal for preventing drainage and creating gels for use on vertical surfaces and as fillers. Note: Fumed Silica adds little structural strength to resin. Use Mi

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Is fumed silica Cancerous

What is Fumed silica?Fumed silica is a universal thickening agent and an anticaking agent (free-flow agent) in powders. Like silica gel, it serves as a desiccant. It is used in cosmetics for its light-diffusing properties. It is used as a light abrasive in products like toothpaste. Abstract. Exposure to crystalline silica dust is associated with an increased risk for pulmonary diseases such as silicosis, tuberculosis, chronic bronchitis, chronic obstructive pulmonary disease (COPD), and lung can

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The vapor silica has high surface activity

In hydrolyzed condensation of vapour silica at high temperature, there is still some silica hydroxyl (Si-OH) residues on the surface. The silica hydroxyl group makes the surface of vapour silica have strong polarity and high surface activity. There are "siloxy group" and "silicon hydroxyl group" on the surface of the vapour phase silicon dioxide, in which the silicon hydroxyl group has high activity, can form hydrogen bonds, or react with other groups, which also ensures that the silicon dioxide

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The unique "three-dimensional dendritic" structure of gaseous silica

In the production process of vapour silica, halosilane is first hydrolyzed and condensed into a single silica Particle. It then gradually grows into a 7-40 nm spherical particle called the "Primary Particle" of silica. The "primary particles" continue to move forward in the direction of the flame in the reactor and collide with each other. Due to the relatively high temperature in the reactor, the particles are still close to a melting state. After the collision, the particles are fused to form

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A matting agent for gaseous silica

The refractive index of gas phase white carbon black is 1.46, close to that of film-forming resin, and does not affect the film's colour. It is an excellent matting agent to migrate to the surface of the paint film in the film-forming process, which can produce the expected roughness of the paint film surface and reduce the surface lustre. The extinction effect mainly depends on three properties of the product: pore volume ratio, particle size and surface treatment. The use of the gas-phase meth

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Rheological auxiliaries of vapor silica

Rheological property is an essential property of coatings, which directly affects the appearance, construction performance and storage stability of layers, and different coating systems have additional requirements for rheological additives. For the oily system, most rheological additives work by forming hydrogen bonds. The gas-phase white carbon black aggregates without surface treatment contain multiple hydroxyl groups, and one is an isolated and undisturbed free hydroxyl group. The second is

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Vapor silica effectively facilitates the flow

What is vaporous silica?Vapour silica is one of the most essential high-tech ultrafine inorganic new materials, with porous, non-toxic, tasteless and pollution-free, the average primary particle size of about 7-40 nano, specific surface area of 50 ~ 380m2/g, high product purity, SiO2 content is not less than 99.8%, is a kind of multi-functional additives. Vapour silica is a kind of ultrafine powder material obtained by hydrolysis and condensation of halosilane in hydrogen and oxygen flame at hig

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Amorphous silicon dioxide product Vapor phase silicon dioxide

What is fumed silica?Vapor phase silicon dioxide (commonly known as vapor phase white carbon black in China, from now on referred to as vapor phase SiO2) is a fine, particular amorphous silicon dioxide product produced by the high-temperature hydrolysis of halosilane in a hydrogen-oxygen flame. The original particle size of this product is between 7-40nm, the specific surface area is generally in the range of 100m2/g~400m2/g, the product purity is high, and the SiO2 content is not less than 99.8

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Ratio and system properties of fumed silica

There is an optimal amount when fumed silica is added to the coating as an additive. If the amount is insufficient, it will not have the expected effect. However, excessive addition of wastes may have side effects, reducing the quality of coating products. To give full play to the functions of fumed silica, it is necessary to fully understand the coating formulation, analyze which raw materials will hinder or promote the processes of fumed silica, and select the optimal addition amount. Feedstoc

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Co dispersant of fumed silica

In a powder system, when dry (low moisture content), particles are less than 75 μ m. The forces between the particles cause the powder to generally bond and agglomerate (especially 25 μ Particles with a size below m), which is challenging for fluidization. At this point, vapor phase silica can be added to solve this problem. The small particle size and high surface energy of fumed silica enable it to adsorb on the surface of the coating powder and form a surface layer on the powder's surface, im

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Production status of fumed silica at home and abroad

Vapor phase silica has a production history of more than 60 years abroad. After years of development and research, countries like the United States, Germany, and Japan have produced and sold fumed silica in large quantities and established a complete application system. In 2000, the global production of fumed silica reached 150000 t/a, with the first manufacturer being Degussa Company of Germany, with a presentation of 60000 t/a, accounting for about 2/5 of the total production of fumed silica i

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Application fields of fumed silica

Vapor phase white carbon black (scientifically known as fumed silica) is a fine, unique amorphous powder material prepared by hydrolysis of dichlorosilane through a high-temperature hydrogen-oxygen flame. The average primary particle size is about 7-40 nm, the aggregate particle size is about 200-300 nm, the specific surface area is 50-380m2/g, the product purity is high, and the SiO2 content is not less than 99.8%. It is a multifunctional additive, widely used in the coating industry, and can p

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