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AEROSIL R 202 is a fumed silica after-treated with polydimethylsiloxane.
AEROSIL R 202 is a trade name for a type of fumed silica, which is a form of silicon dioxide. 
AEROSIL R 202's commonly used as a thickening agent, anticaking agent, and as a carrier in powders in various industries including pharmaceuticals, cosmetics, and food. 

CAS Number: 109944-58-3

Synonyms: SILICON DIOXIDE, Silica, Dioxosilane, Quartz, 7631-86-9, Silica gel, Cristobalite, Tridymite, 14808-60-7, Silicic anhydride, 112945-52-5, 61790-53-2, Sand, 112926-00-8, KIESELGUHR, Aerosil, Diatomaceous silica, Wessalon, 60676-86-0, Silicon(IV) oxide, Zorbax sil, 14464-46-1, Silica, amorphous, QUARTZ (SIO2), Dicalite, Ludox, Nyacol, Amorphous silica, Cristobalite (SiO2), Cab-O-sil, SILICA, VITREOUS, Sillikolloid, Extrusil, Santocel, Sipernat, Superfloss, Acticel, Carplex, Neosil, Neosyl, Porasil, Silikil, Siloxid, 91053-39-3, Zipax, Aerosil-degussa, Silicon oxide, Aerosil 380, Synthetic amorphous silica, Quartz sand, Rose quartz, Silica particles, Cab-o-sil M-5, Silica, fumed, Snowtex O, Silica, colloidal, Tokusil TPLM, Dri-Die, 68855-54-9, Manosil vn 3, Colloidal silicon dioxide, Ultrasil VH 3, Ultrasil VN 3, Aerosil bs-50, Carplex 30, Carplex 80, Snowtex 30, Zeofree 80, Aerosil K 7, Cabosil N 5, Syton 2X, Amorphous silica gel, Positive sol 232, Siliziumdioxid, Aerogel 200, Aerosil 300, Chalcedony, Diatomite, Ludox hs 40, Silanox 101, Silica (SiO2), Vitasil 220, Agate, Positive sol 130M, Silica vitreous, Silicon dioxide (amorphous), Aerosil A 300, Aerosil E 300, Aerosil M-300, colloidal silica, Fused silica, Quartz glass, Silica slurry, Silicon dioxide, fumed, Silicone dioxide, Nalfloc N 1050, Quso 51, Silica, amorphous fused, Nalco 1050, Quso G 30, 15468-32-3, Hydrophobic silica 2482, Kieselsaeureanhydrid, Min-U-Sil, SiO2, CCRIS 3699, Silica Gel, 40-63 Micron Particles, Silica aerogel, (SiO2)n, UNII-ETJ7Z6XBU4, ETJ7Z6XBU4, Silicon Dioxide, Amorphous, Silica 2482, hydrophobic, Silicon dioxide, chemically prepared, 15723-40-7, EINECS 231-545-4, CAB-O-SIL N-70TS, EPA Pesticide Chemical Code 072605, CI 7811, Aerosil 200, 13778-37-5, 99439-28-8, CHEBI:30563, AI3-25549, Crystalline silica, N1030, U 333, Silica gel 60, 230-400 mesh, Silicon dioxide, colloidal, ENT 25,550, [SiO2], Silica, crystalline - fused, Silicagel, Silica gel, pptd.,cryst.-free, 13778-38-6, 17679-64-0, Christensenite, Crystoballite, Silica gel desiccant, indicating, Celite, INS-551, Calcined diatomite, MFCD00011232, MFCD00217788, Silica, amorphous,fumed, cryst.-free, Silica, mesostructured, Amethyst, Aquafil, Cataloid, Crysvarl, Flintshot, Nalcoag, Novaculite, Silikill, Vulkasil, Cherts, Snowit, Imsil, Metacristobalite, silica sand, Quartz silica, alpha-Quartz, Fossil flour, Fumed silica, Quartz dust, Rock crystal, Silica dust, White carbon, SIMETHICONE COMPONENT SILICON DIOXIDE, Chromosorb P, Tiger-eye, E-551, Vulkasil S, Celite superfloss, Cristobalite dust, Corasil II, Silver bond B, Cab-O-sperse, alpha-Cristobalite, alpha-Crystobalite, Gold bond R, (SiO2), Cabosil st-1, Silica Standard: SiO2 @ 100 microg/mL in H2O, Sil-Co-Sil, Silica Standard: SiO2 @ 1000 microg/mL in H2O, Siderite (SiO2), Tridymite 118, Cab-O-grip II, Tridimite [French], HI-Sil, Amorphous silica dust, Silicon Oxide Hollow Nanospheres, Nyacol 830, Sibelite M 3000, Sibelite M 4000, Sibelite M 6000, Quazo puro [Italian], SILICA, AMORPHOUS (IARC), SILICA, AMORPHOUS [IARC], Caswell No. 734A, Sicron F 300, Sikron F 100, Spectrosil, Accusand, Coesite, Fuselex, Nalcast, Nyacol 1430, Optocil, Quartzine, Quarzsand, Rancosil, Suprasil, Tridimite, Siltex, Vitreous quartz, Vitreous silica, Tridymite dust, W 12 (Filler), beta-Quartz, Fused quartz, MIN-U-sil alpha quartz, Quartz-beta, Amorphous quartz, Dri-Die insecticide 67, Quazo puro, Silica, amorphous, fumed, Vitrified silica, Pyrogenic colloidal silica, Silica, fused, Suprasil W, Vitreosil IR, Borsil P, Dioxide, Silicon, Silane, dioxo-, Crystallized silicon dioxide, Optocil (quartz), CP-SilicaPLOT, Sand, Sea, Silicon oxide, di- (sand), 43-63C, Quarzsand [German], S-Col, Admafine SO 25H, Admafine SO 25R, Admafine SO 32H, Admafine SO-C 2, Admafine SO-C 3, Cristobalite asbestos, Keatite (SiO2), Sg-67, Silica, amorphous, fumed, cryst.-free.

AEROSIL R 202 is known for its high purity, surface area, and controlled particle size distribution. 
It typically appears as a white, fluffy powder composed of nanoscale particles.
The silicone oil treatment guarantees the marked hydrophobia of the product.

Fumed silica particles are extremely small and have a very large surface area, which gives them unique properties like thixotropy (the ability to become fluid when shaken or stirred and return to a gel-like state when left undisturbed) and reinforcement in composites.
Highly efficient effect in the thickening and thixotropy of complex polar liquids, such as those based on epoxy, polyurethane, or vinylester resins.
Improves the water resistance of moisture-sensitive formulations, such as cosmetic preparations.
Improvement of the anti-settling behavior of pigments and anti-sagging behavior in 2-C epoxy coatings.

With silicone oil treatment, AEROSIL R 202 offers a tailor-made chemical surface treatment.
Due to its excellent electrical insulating ability and low water absorption, this hydrophobized, small-particle silica easily acquires and conserves electrical charge. 
AEROSIL R 202 is therefore typically used as a surface additive for toner particles in order to increase charge and improve flowability.

The high hydrophobicity of PDMS-treated, small particle AEROSIL R 202 grades makes them particularly effective for achieving a high tribo-charge.
At the same time, PDMS-treated, small particle AEROSIL R 202 grades maintain good flowability.
The slightly oily effect of the AEROSIL R 202 treatment provides additional benefits in some printing processes.

AEROSIL R 202 is a fumed silica after treated with a polydimethylsiloxane. 
It is used for adhesives and sealants, epoxy-, vinylester resins, cable gels, and gelcoats. 
AEROSIL R 202 helps with the thickening and thixotropy of complex polar liquids based on epoxy, polyurethane, or vinylester resins. 

AEROSIL R 202 also helps the thickening and thixotropy of cable gels for fiber optic cables.
AEROSIL R 202 by Evonik is a hydrophobic fumed silica (surface-treated with polydimethylsiloxane) grade. 
Exhibits highly efficient effect in the thickening & thixotropy of complex polar liquids, such as those based on epoxy, polyurethane, or vinylester resins.

The Evonik Corporation Silicas business line is a part of the Smart Materials Division and brings together Evonik’s fumed silica and precipitated silica for industrial applications. 
Sold under the brands AEROSIL R 202, these high-performance materials find application in plastics, agriculture, home care and detergents, adhesives & sealants and many other industries.
AEROSIL R 202 is a fumed silica surface-treated with polydimethylsiloxane with very good thickening properties.

AEROSIL R 202 is a specific grade of fumed silica produced by Evonik Industries. 
Fumed silica is manufactured through a high-temperature flame hydrolysis process of silicon tetrachloride (SiCl4), resulting in ultrafine particles of silicon dioxide with high purity. 
These particles are then treated with various surface modifiers to achieve desired properties.

Large quantities of bonding pastes are used in the manufacturing of wind turbine rotor blades. 
The normal production procedure is to manufacture the upper and lower shell of the rotor blade shell in separate molds and glue them together by the bonding pastes. 
These bonding pastes must have good thixotropic and specific slump properties. 

That is why AEROSIL R 202 fumed silica are used as standard thixotropes in bonding pastes based on epoxy, polyurethane and vinylester resins. 
The hydrophobic fumed silicas AEROSIL R 202 is high-performance thixotropes used in bonding pastes for the manufacturing of rotor blades. 
Furthermore, bonding pastes must also possess excellent fatigue properties. 

Structure-modified fumed silica grades like AEROSIL R 202 can adjust bonding pastes with excellent reinforcing properties.
Organofunctional silanes like AEROSIL R 202 act as adhesion promoters in bonding pastes, and they can further improve the crosslinking density of suitable bonding pastes.
A highly hydrophobic treated fumed silica that is efficient in the thickening and thixotropy of polar emollients and natural triglycerides. 

AEROSIL R 202 also aids in the stability and anti settling of particles in liquid formulations.
AEROSIL R 202 by Evonik acts as a thickening and thixotropic agent of cable gels for fiber optic cables. 
It improves flowability of powders and enables achieving of a high tribo-charge.

AEROSIL R 202, also known as silica, is an oxide of silicon with the chemical formula SiO2, commonly found in nature as quartz.
In many parts of the world, silica is the major constituent of sand. 
Silica is abundant as it comprises several minerals and synthetic products. 

All forms are white or colorless, although impure samples can be colored.
AEROSIL R 202 is a common fundamental constituent of glass.
AEROSIL R 202 the majority of silicon dioxides, the silicon atom shows tetrahedral coordination, with four oxygen atoms surrounding a central Si atom. 

Thus, SiO2 forms 3-dimensional network solids in which each silicon atom is covalently bonded in a tetrahedral manner to 4 oxygen atoms. 
In contrast, CO2 is a linear molecule. 
The starkly different structures of the dioxides of carbon and silicon are a manifestation of the double bond rule.

Based on the crystal structural differences, AEROSIL R 202 can be divided into two categories: crystalline and non-crystalline (amorphous). 
In crystalline form, this substance can be found naturally occurring as quartz, tridymite (high-temperature form), cristobalite (high-temperature form), stishovite (high-pressure form), and coesite (high-pressure form). 
On the other hand, amorphous silica can be found in nature as opal and diatomaceous earth. 

Quartz glass is the form of intermediate state between this structure.
All of this distinct crystalline forms always have the same local structure around Si and O. In α-quartz the Si–O bond length is 161 pm, whereas in α-tridymite it is in the range 154–171 pm. 
The Si–O–Si angle also varies between a low value of 140° in α-tridymite, up to 180° in β-tridymite. 

AEROSIL R 202 is valued for its ability to control the rheological properties of various formulations. 
It can be used to adjust viscosity, prevent sagging or settling in coatings and paints, and enhance the stability of suspensions.
In many liquid formulations such as paints, coatings, and adhesives, AEROSIL R 202 acts as an anti-settling agent. 

AEROSIL R 202 helps to maintain the uniform distribution of solid particles or pigments throughout the formulation, preventing settling or sedimentation over time.
In coatings and paints, AEROSIL R 202 can be used as a matting agent to reduce gloss and provide a matte finish. 
This is particularly useful in applications where a low sheen or satin appearance is desired.

In powdered formulations, AEROSIL R 202 serves as a free-flow agent, improving the flow properties of powders and preventing clumping or caking. 
This is important for products like powdered food ingredients, pharmaceuticals, and industrial powders.
AEROSIL R 202 is an effective thickening agent in various systems, including adhesives, sealants, and personal care products. 

It helps to increase viscosity, improve stability, and enhance the overall performance of these formulations.
Due to its high surface area and unique structure, AEROSIL R 202 is often used as a suspension aid in liquid formulations. 
AEROSIL R 202 helps to keep solid particles uniformly dispersed in the liquid phase, preventing settling and ensuring product stability.

In pharmaceutical and cosmetic formulations, AEROSIL R 202 can serve as a carrier for active ingredients, helping to deliver them evenly and effectively to the desired target area.
AEROSIL R 202 can be surface-modified to impart hydrophobic properties, making it suitable for use in water-repellent coatings, sealants, and other applications where water resistance is required.
In rubber and polymer composites, AEROSIL R 202 acts as a reinforcement agent, improving mechanical properties such as tensile strength, tear resistance, and dimensional stability.

Alpha quartz is the most stable form of solid SiO2 at room temperature. 
The high-temperature minerals, cristobalite and tridymite, have both lower densities and indices of refraction than quartz. 
The transformation from α-quartz to beta-quartz takes place abruptly at 573 °C. 

Since the transformation is accompanied by a significant change in volume, AEROSIL R 202 can easily induce fracturing of ceramics or rocks passing through this temperature limit.
The high-pressure minerals, seifertite, stishovite, and coesite, though, have higher densities and indices of refraction than quartz.
Stishovite has a rutile-like structure where silicon is 6-coordinate. 

The density of stishovite is 4.287 g/cm3, which compares to α-quartz, the densest of the low-pressure forms, which has a density of 2.648 g/cm3.
The difference in density can be ascribed to the increase in coordination as the six shortest Si–O bond lengths in stishovite (four Si–O bond lengths of 176 pm and two others of 181 pm) are greater than the Si–O bond length (161 pm) in α-quartz.
The change in the coordination increases the ionicity of the Si–O bond.

AEROSIL R 202, another polymorph, is obtained by the dealumination of a low-sodium, ultra-stable Y zeolite with combined acid and thermal treatment. 
The resulting product contains over 99% silica, and has high crystallinity and specific surface area (over 800 m2/g). 
AEROSIL R 202 has very high thermal and acid stability. 

For example, AEROSIL R 202 maintains a high degree of long-range molecular order or crystallinity even after boiling in concentrated hydrochloric acid.
AEROSIL R 202 is found naturally in the ground and in our bodies. 
There isn’t evidence that AEROSIL R 202’s dangerous to ingest it through food, but inhaling its dust particles could lead to lung problems.

AEROSIL R 202 is a natural chemical mix of silicon and oxygen that has uses in many food products as an anticaking agent. 
AEROSIL R 202 is generally safe as a food additive, though some agencies are calling for stricter guidelines about silicon dioxide in foods.
AEROSIL R 202, also known as silica or SiO2, is a naturally occurring compound. 

It's made of silicon and oxygen. Both elements are abundant on our planet.
AEROSIL R 202, compound of the two most abundant elements in Earth’s crust, silicon and oxygen, SiO2. 
The mass of Earth’s crust is 59 percent silica, the main constituent of more than 95 percent of the known rocks. 

AEROSIL R 202 has three main crystalline varieties: quartz (by far the most abundant), tridymite, and cristobalite. 
Other varieties include coesite, keatite, and lechatelierite. 
Silica sand is used in buildings and roads in the form of portland cement, concrete, and mortar, as well as sandstone. 

Silica also is used in grinding and polishing glass and stone; in foundry molds; in the manufacture of glass, ceramics, silicon carbide, ferrosilicon, and silicones; as a refractory material; and as gemstones. 
AEROSIL R 202 is often used as a desiccant to remove moisture.
AEROSIL R 202 is used as a pharmaceutical excipient in formulations for tablets, capsules, creams, and gels to improve flow properties, enhance texture, and control rheology.

AEROSIL R 202 is utilized in cosmetics and personal care products such as lotions, creams, and toothpaste as a thickening agent, suspension aid, and to provide a silky feel.
In the food industry, AEROSIL R 202 serves as an anticaking agent, preventing clumping in powdered products like spices, powdered drinks, and dry mixes. 
AEROSIL R 202 also functions as a viscosity modifier and stabilizer in liquids.

AEROSIL R 202 is added to paints, coatings, and adhesives to improve rheological properties, prevent settling, enhance flow control, and provide thixotropic behavior.
AEROSIL R 202 is used to reinforce adhesives and sealants, improving their mechanical properties, reducing shrinkage, and enhancing adhesion.
AEROSIL R 202 is employed as a reinforcing filler in elastomers, plastics, and silicone rubber, enhancing mechanical strength, tear resistance, and dimensional stability.

Uses Of AEROSIL R 202:
Release to the environment of AEROSIL R 202 can occur from industrial use: industrial abrasion processing with low release rate (e.g. cutting of textile, cutting, machining or grinding of metal), of articles where the substances are not intended to be released and where the conditions of use do not promote release and industrial abrasion processing with high release rate (e.g. sanding operations or paint stripping by shot-blasting).
Other release to the environment of AEROSIL R 202 is likely to occur from: indoor use in long-life materials with low release rate (e.g. flooring, furniture, toys, construction materials, curtains, foot-wear, leather products, paper and cardboard products, electronic equipment) and outdoor use in long-life materials with low release rate (e.g. metal, wooden and plastic construction and building materials).

AEROSIL R 202 can be found in complex articles, with no release intended: machinery, mechanical appliances and electrical/electronic products e.g. refrigerators, washing machines, vacuum cleaners, computers, telephones, drills, saws, smoke detectors, thermostats, radiators, large-scale stationary industrial tools) and Vehicles (e.g. personal vehicles, delivery vans, boats, trains, metro or planes)).
AEROSIL R 202 can be found in products with material based on: stone, plaster, cement, glass or ceramic (e.g. dishes, pots/pans, food storage containers, construction and isolation material), plastic (e.g. food packaging and storage, toys, mobile phones), metal (e.g. cutlery, pots, toys, jewellery) and wood (e.g. floors, furniture, toys).

AEROSIL R 202 is used in the following products: adsorbents, coating products, adhesives and sealants, pH regulators and water treatment products and non-metal-surface treatment products.
AEROSIL R 202 is used in the following areas: health services, formulation of mixtures and/or re-packaging and agriculture, forestry and fishing.
AEROSIL R 202 is used for the manufacture of: chemicals and textile, leather or fur.

Other release to the environment of AEROSIL R 202 is likely to occur from: indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners), outdoor use, indoor use in close systems with minimal release (e.g. cooling liquids in refrigerators, oil-based electric heaters) and outdoor use in close systems with minimal release (e.g. hydraulic liquids in automotive suspension, lubricants in motor oil and break fluids).
AEROSIL R 202 is used in the following products: polymers, coating products, polishes and waxes, non-metal-surface treatment products and inks and toners.
Release to the environment of this substance can occur from industrial use: formulation of mixtures and formulation in materials.

AEROSIL R 202 is used in the following products: adsorbents, pH regulators and water treatment products, fillers, putties, plasters, modelling clay, polymers, coating products, non-metal-surface treatment products and metal surface treatment products.
AEROSIL R 202 is used in the following areas: formulation of mixtures and/or re-packaging and agriculture, forestry and fishing.
AEROSIL R 202 is used for the manufacture of: chemicals and textile, leather or fur.

Release to the environment of AEROSIL R 202 can occur from industrial use: in the production of articles, in processing aids at industrial sites, as an intermediate step in further manufacturing of another substance (use of intermediates), as processing aid, as processing aid and of substances in closed systems with minimal release.
AEROSIL R 202 is used as a rheology modifier and anti-settling agent in coatings and paints. 
AEROSIL R 202 helps to control viscosity, prevent sagging, and maintain uniform dispersion of pigments, resulting in improved coating quality and appearance.

In adhesives and sealants, AEROSIL R 202 serves as a thickening agent, reinforcing filler, and anti-settling agent. 
It improves adhesion strength, prevents sagging or slumping, and enhances the overall performance and stability of the formulations.
AEROSIL R 202 is used as a pharmaceutical excipient in tablet formulations to improve flow properties, enhance compressibility, and control release profiles. 

AEROSIL R 202 is also employed in topical formulations such as creams and gels as a rheology modifier and thickening agent.
In cosmetics and personal care products, AEROSIL R 202 functions as a thickening agent, suspending agent, and texturizer. 
It imparts smoothness, creaminess, and stability to lotions, creams, toothpaste, and other formulations.

AEROSIL R 202 is used as an anti-caking agent in powdered food products to prevent clumping and improve flowability. 
It is also employed as a thickener, stabilizer, and texture modifier in beverages, sauces, and dressings.
In rubber and plastic applications, AEROSIL R 202 acts as a reinforcing filler, improving mechanical properties such as strength, tear resistance, and dimensional stability. 

AEROSIL R 202 is particularly effective in silicone rubber formulations.
AEROSIL R 202 finds uses in various industrial applications such as catalyst supports, chromatography, and as a processing aid in the production of catalysts, batteries, and electronic components.
AEROSIL R 202 is used in toothpaste, skincare, and hair care products for its thickening and texture-enhancing properties.

AEROSIL R 202 is used in the production of inks and pigments to control rheology and improve dispersion.
AEROSIL R 202 finds applications in drilling fluids, cementing, and completion fluids in the oil and gas industry for its rheological properties and stability.

Safety Profile Of AEROSIL R 202:
Inhalation of fine particles of AEROSIL R 202 can cause respiratory irritation, especially if exposure occurs in poorly ventilated areas or during activities such as handling, mixing, or processing dry powders. 
Prolonged or repeated inhalation may lead to respiratory sensitization or exacerbate pre-existing respiratory conditions.
Direct contact with AEROSIL R 202 may cause skin irritation, particularly if the skin is dry or damaged. 

AEROSIL R 202 can also cause irritation to the eyes upon contact. Proper personal protective equipment (PPE) such as gloves, goggles, and protective clothing should be worn to prevent skin and eye contact.
AEROSIL R 202 is a fine powder that can form explosive dust clouds in the air under certain conditions. 

This poses a risk of dust explosions in confined spaces or areas with high concentrations of airborne particles. 
Adequate ventilation, dust control measures, and proper housekeeping practices are essential to minimize the risk of dust explosions.

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