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Aerosil 200 works as anti-settling, thickening and anti-sagging agent.
Aerosil 200 is a hydrophilic fumed silica.
Aerosil 200 permits rheology and thixotropy control of liquid systems, binders, polymers.
CAS Number: 7631-86-9
Molecular Formula: O2Si
Molecular Weight: 60.08
EINECS Number: 231-545-4
Synonyms: Silicon Dioxide, Silica, Dioxosilane, 7631-86-9, Silicic anhydride, Diatomaceous silica, Wessalon, Zorbax sil, Silica, amorphous, Silica, colloidal, Sillikolloid, Extrusil, Santocel, Sipernat, Acticel, Carplex, Neosil, Neosyl, Porasil, Silikil, Siloxid, Zipax, Aerosil 380, colloidal silica, White carbon, Silicone dioxide, Cab-o-sil M-5, Vulkasil S, Snowtex O, Corasil II, Tokusil TPLM, Dri-Die, Manosil vn 3, Ultrasil VH 3, Ultrasil VN 3, Carplex 30, Carplex 80, Snowtex 30, Zeofree 80, Aerosil K 7, Min-U-Sil, Syton 2X, Positive sol 232, Aerogel 200, Aerosil 300, Amorphous silica dust, Ludox hs 40, Silanox 101, Vitasil 220, Positive sol 130M, Silicon dioxide (amorphous), Aerosil A 300, Aerosil E 300, Silicon dioxide, fumed, Nalfloc N 1050, Quso 51, Quso G 30, Aerosil 200, Sg-67, CHEBI:30563, ETJ7Z6XBU4, HK 400, CI 7811, U 333, INS NO.551, DTXSID1029677, INS-551, E-551, Dioxide, Silicon, 380, Aerosil, Quso G32, G32, Quso, Quso G 32, Precipitated amorphous silica, Sandstone, Silicea, Silica marina, Naturasil Scars, Olea Olidental, Super-cel, Fire Agate, Red Jasper, Red Quartz, Tigers Eye, Chrysolith 6X, Silicea 3X, Silicea 6X, Dental type silica, Honest-Paste Kids, Quartz 8, Silicea 12X, Silicea 30C, Silicea 30X, Aventurine 8101, Chrysoprase 8113, Quartz 30, Sandstone 8144, Aerosil 130, HAIRBALLS, Silicea 200C, Silicea 200X, SKIN ERUPTIONS, Syloid 244, Carneol 8109, Citrine 8114, Fire Agate 8116, Red Jasper 8138, Red Quartz 8139, Silicea 8012, Tigers Eye 8152, Rose Quartz 8142, Naturasil Stretch Marks, Cab-O-Sil M-5P, Silica 6 Special Order, SILICEA 200ck, Quso F-22, silica (silicon dioxide), OPRECARE 12, OPRECARE 24, TONICPET 12, Jasper 17 Special Order, Quartz 60 Special Order, Silica 20 Special Order, Silica 30 Special Order, 28TAK DOUX TOOTH, SCAR REMOVAL SHEETS, Silicea Organic Cane Sugar, TOOTH NOTE AQUA MINT, 2080 Dentistry Night Fresh, Fruity Scrub Body Exfoliation, PHYENLIMCIDE TOOTHPASTE, Rxhomeo Homeopathic Combo 21, 2080 Dentistry Night Repair, Dr. Zenni Kids tooth (Baby), DTXCID009677, Cinis comp A 21 Special Order, Nekvnro SCAR REMOVAL SHEETS, Jacksons Cell Salts SILICA 6X, TOOTH NOTE PINEAPPLE MINT, Bestmade Natural Products Silicea, Cinis comp. 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Aerosil 200 is a high-purity, fumed amorphous silica manufactured by Evonik Industries through a flame hydrolysis process, in which silicon tetrachloride (SiCl₄) is reacted in a hydrogen-oxygen flame.
This process produces extremely fine silica particles that aggregate into a loose, white, fluffy powder with a very large specific surface area of approximately 200 m²/g, hence the name “200”.
Aerosil 200 belongs to the hydrophilic (water-attracting) grade of AEROSIL materials, meaning its surface contains silanol groups (Si–OH) that allow it to interact effectively with polar systems, such as water-based formulations or hydrogen-bonding materials.
Because of its fine particle size (primary particles around 12 nanometers), high surface area, and purity (over 99.8% SiO₂), Aerosil 200 plays a crucial role in modifying the rheology, stability, and mechanical performance of a wide variety of products across different industries.
Aerosil 200 occurs almost everywhere on earth.
Aerosil 200 is one of the most important and abundant oxides on earth, constituting about 60% weight of the earth’s crust as silica itself or in combination with other metal oxides in silicates.
Aerosil 200 commonly is found as sand in the vast ocean and river shores, their beds, deserts, rocks, and minerals.
Aerosil 200 exists in several structural forms: polymorphic crystalline silica, synthetic quartz crystals, amorphous silica, and vitreous silica.
This classification is not complete as there are other forms of silica synthesized for specialized applications.
A silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.
Aerosil 200 is a hydrophilic fumed silica with a specific surface area of 200 m²/g. With this product, rheology and thixotropy control of liquid systems, binders, and polymers is possible easily.
It is also used to improve free flow and anti-caking characteristics of powders as well as an anti-settling, thickening, and anti-sagging agent.
As ingredient Aerosil 200 can be used in a broad variety of applications, like lipsticks, sulfate-free shampoos, mascara.
Aerosil 200 is listed with the INCI-name 'Silica' and holds a COSMOS certification.
Aerosil 200 is silicon dioxide, one of the most abundant materials on the earth's crust.
Aerosil 200 is used as a filler in fertilizers, and also, in the manufacture of glass, ceramics, abrasives, rubber and cosmetics.
Aerosil 200 is an anti-caking, free-flowing, gelling, suspending, dispersing and thickening agent.
It is hydrophilic fumed silica which is used to transform cosmetic oils to highly viscous gels.
It produces largely transparent products with a markedly pseudoplastic flow behavior.
In toothpaste formulations, whether in all-silica formulations, in carbonate pastes, or in those using phosphate abrasives, it gives the rheological body.
Aerosil 200 can help increase the volume of the hair, counteracting the flattening effect of the conditioning agents.
It prevents a premature reaction and caking of powdered colorant component (hair dyes).
Aerosil 200 helps improve the homogeneous distribution of the pigments in color cosmetics.
It prevents the agglomeration of active ingredients—generally aluminum and zirconium salts (AP salts)-helping to ensure that they are evenly distributed and have an intense and long-lasting effect.
Aerosil 200 also avoids white residue.
Aerosil 200 is suggested for use in skin care, oral care, hair care (beaches, dyes, conditioners), make-up (powder, nail polish, lipstick/lip gloss) and antiperspirants & deodorants (sticks) applications.
One of the primary uses of AEROSIL® 200 is to control the flow behavior (viscosity) of liquids and pastes. When added to formulations such as paints, inks, adhesives, or coatings, it forms a three-dimensional network through hydrogen bonding, making the mixture more viscous and preventing it from dripping, sagging, or separating.
In systems with suspended particles—like pigments in paints, fillers in epoxy resins, or actives in cosmetics—Aerosil 200 helps keep those particles evenly dispersed by preventing sedimentation over time.
It is especially valuable in low-viscosity liquids where settling would otherwise occur quickly.
While Aerosil 200 is non-toxic and non-crystalline (thus not causing silicosis), it is very dusty and lightweight, which makes it easy to inhale or disperse into the air during handling.
Proper safety practices such as dust masks, gloves, goggles, and localized ventilation are strongly recommended in industrial environments.
Melting point: >1600 °C (lit.)
Boiling point: >100 °C (lit.)
Density: 2.2–2.6 g/mL at 25 °C
Bulk density: 200–800 kg/m³
Vapor pressure: 13.3 hPa at 1732 °C
Refractive index: 1.46
Flash point: 2230 °C
Storage temperature: 2–8 °C
Solubility: Practically insoluble in water and mineral acids (except hydrofluoric acid). Dissolves in hot alkali hydroxide solutions.
Form: Suspension
pKa: 6.65–9.8 (at 20 °C)
Specific gravity: 2.2
Color: White to yellow
Odor: Odorless (at 100%)
pH: 5–8 (100 g/L, H₂O, 20 °C) — slurry
Resistivity: 1 × 10²⁰ μΩ·cm (ρ)
Water solubility: Insoluble
Sensitive: Hygroscopic
Hydrolytic sensitivity: 6 — forms irreversible hydrate
Crystal structure: Trigonal
Merck Index: 14,8493
Exposure limits:
• NIOSH IDLH: 3000 mg/m³
• NIOSH TWA: 6 mg/m³
Stability: Stable
Aerosil 200 gives non-Newtonian flow properties to liquids, meaning the viscosity changes with applied stress.
In practical terms, this means a formulation becomes thinner when stirred or pumped but returns to a thicker state when left undisturbed.
Thanks to its high surface area and moisture-binding ability, Aerosil 200 is used in powdered food, pharmaceuticals, and agrochemicals to prevent clumping and enhance flowability.
Aerosil 200 coats individual particles, reducing friction and preventing moisture from causing agglomeration.
In silicone rubber formulations, Aerosil 200 acts as a mechanical reinforcement agent, significantly improving tensile strength, elongation, and elasticity.
It’s crucial in making high-performance elastomeric products used in automotive, electronics, and medical devices.
In tablet and capsule production, Aerosil 200 improves the flowability of powders, making filling, mixing, and pressing more consistent.
It also enhances tablet disintegration and stability, contributing to better product uniformity and shelf-life.
Due to its optical clarity and dielectric properties, Aerosil 200 is used in optical adhesives, LED encapsulants, and electronic coatings to improve transparency, heat resistance, and moisture control in sensitive environments.
In skincare, sunscreen, and makeup products, it functions as a texturizer, oil absorber, and stabilizer.
Aerosil 200 gives products a smooth, silky feel, reduces greasiness, and extends shelf life by preventing ingredient separation.
Aerosil 200 improves the flow properties, dispersibility, and stability of pesticide formulations, fungicidal powders, and crop protection granules.
Aerosil 200 acts as a carrier or anti-caking agent, especially in formulations where active ingredients are prone to moisture absorption or poor dispersion.
The surface of Aerosil 200 contains many silanol (Si–OH) groups, making it highly reactive toward hydrogen bonding and polar compounds.
Diatomaceous earth is used as a filtering agent and as a filler in construction materials, pesticides, paints, and varnishes.
The calcined version (which has been heat treated) is the most dangerous and contains crystallized silica, and should be handled as silica.
Purification of silica for high technology applications uses isopiestic vapour distillation from concentrated volatile acids and is absorbed in high purity water.
The impurities remain behind preliminary cleaning to remove surface contaminants uses dip etching in HF or a mixture of HCl, H2O2 and deionised water.
Colorless amorphous (i.e., fused silica) or crystalline (i.e., quartz) material having a low thermal expansion coefficient and excellent optical transmittance in far UV.
Silica is insoluble in strong mineral acids and alkalis except HF, concentrated H3PO4, NH4 HF2 , concentrated alkali metal hydroxides.
Owing to its good corrosion resistance to liquid metals such as Si, Ge, Sn, Pb, Ga, In, Tl, Rb, Bi, and Cd, it is used as crucible container for melting these metals, while silica is readily attacked in an inert atmosphere by molten metals such as Li, Na, K Mg, and Al.
Aerosil 200 is obtained like silica gel by acidifying an aqueous solution of sodium silicate.
Aerosil 200 is used as filler in rubber for automobile tires and reinforcement particulate in elastomers, and as a flatting agent in paints and coatings for improving the flatness of coatings.
Aerosil 200, amorphous is a noncombustible solid. Generally unreactive chemically.
Incompatible with fluorine, oxygen difluoride, chlorine trifluoride.
Soluble in molten alkalis and reacts with most metallic oxides at high temperature.
Uses:
Aerosil 200 is also known as silicone dioxide.
Aerosil 200 has a variety of applications: to control a product’s viscosity, add bulk, and reduce a formulation’s transparency.
Aerosil 200 can also function as an abrasive.
In addition, it can act as a carrier for emollients, and may be used to improve a formulation’s skin feel.
Aerosil 200 is porous and highly absorbent, with absorption capabilities roughly 1.5 times its weight.
A typical claim associated with silica is oil control.
Aerosil 200 is found in sunscreens, scrubs, and wide range of other skin care, makeup, and hair care preparations.
Aerosil 200 has been successfully used in hypoallergenic and allergy-tested formulations.
Functionalized RAFT agent for controlled radical polymerization; especially suited for the polymerization of styrene; acrylate and acrylamide monomers.
Aerosil 200 group can be used to conjugate to a variety of alkyne-functionalized biomolecules.
Aerosil 200 mixture of sodium alkyl sulfates consisting chiefly of sodium lauryl sulfate
Aerosil 200 is mined from deposits of diatomaceous soft chalk-like rock (keiselghur).
This is an important group of extender pigments, which is used in a variety of particle sizes.
They are used as a flatting agent to reduce gloss of clear coatings and to impart shear thinning flow properties to coatings.
Aerosil 200, amorphous is used as carriers, processing aids, anti-caking and free-flow agents in animal feed.
Defoamer applications such as paint, food, paper, textile and other industrial applications.
Synthetic silicon dioxides are used as a rheology control agent in plastics.
Aerosil 200 is also used to manufacture adhesives, sealants and silicones.
Aerosil 200 is widely used as a rheological additive to control and adjust the viscosity and flow behavior of liquid formulations, such as paints, coatings, sealants, and adhesives.
When dispersed evenly, it creates a three-dimensional network of silica aggregates through hydrogen bonding, which allows the material to resist dripping, running, or sagging under the force of gravity.
This property is particularly valuable in vertical applications or during the storage of low-viscosity formulations where stability is essential.
In the rubber and elastomer industries, Aerosil 200 is incorporated into silicone rubber formulations as a reinforcing filler to significantly enhance the mechanical properties of the final product.
By interacting with the silicone polymer matrix, it improves tensile strength, tear resistance, elasticity, and elongation at break, which are critical for applications requiring flexibility, durability, and mechanical resilience—such as in automotive gaskets, medical-grade tubing, or electronics insulation materials.
Due to its high surface area and moisture-binding capacity, Aerosil 200 is commonly added to powdered products like food ingredients, pharmaceutical excipients, detergents, and fertilizers to act as an anti-caking agent.
Aerosil 200 coats individual particles and absorbs ambient moisture, preventing powders from clumping together during storage or transport.
This ensures that the powder remains free-flowing, which improves dosing accuracy and ease of handling in both industrial and consumer settings.
In personal care and cosmetic products such as sunscreens, lotions, gels, serums, and makeup, Aerosil 200 is used to thicken formulations, stabilize emulsions, and enhance the sensory profile.
Aerosil 200 provides a smooth, silky texture and improves the consistency of creams and gels without the need for synthetic polymers or waxes.
In addition, it helps suspend pigments or active ingredients evenly throughout the formula, preventing separation or settling over time.
Aerosil 200 is used in the pharmaceutical industry as a glidant or flow aid during tablet and capsule manufacturing.
It is often added to powdered or granular active pharmaceutical ingredients (APIs) and excipients to improve their flowability through machinery, ensuring uniform weight and distribution in tablets.
Furthermore, it minimizes sticking and clumping during mixing, pressing, and filling processes, thereby enhancing production efficiency and product consistency.
In inks and pigmented coatings, Aerosil 200 serves as an effective anti-settling and suspension agent, especially for heavier pigments or fillers that tend to settle at the bottom of containers.
Its high surface area enables it to form a network that traps and suspends these particles, maintaining uniform color, gloss, and performance in the final application.
This makes it highly beneficial in automotive paints, industrial coatings, and UV-curable printing inks.
AEROSIL® 200 is often used as a carrier matrix for transforming liquid, oily, or volatile components into dry, free-flowing powders in applications such as fragrance powders, oil-based pharmaceuticals, or agrochemical formulations.
The silica adsorbs the liquid into its porous structure, allowing it to be processed and delivered in solid form, which improves handling, storage, and controlled release of the active ingredients.
Because of its chemical purity, small particle size, and low refractive index, Aerosil 200 is suitable for use in optical coatings, transparent adhesives, and electronics encapsulation materials where clarity and stability are important.
Additionally, due to its low thermal conductivity, it can be used as an insulating additive in high-performance materials designed for thermal protection and energy efficiency, such as in aerospace panels or high-temperature sealants.
Safety Profile:
Aerosil 200 is not chemically corrosive or acutely toxic, it can still cause mechanical irritation to the skin and eyes due to its abrasive, high surface-area texture.
If the powder comes into contact with the skin, especially in dry or sensitive areas, it may cause dryness, itching, or minor irritation.
Accidental eye exposure may lead to grittiness, tearing, redness, or mild conjunctival inflammation, and therefore eye protection such as safety goggles is recommended during handling.
The pure unaltered form is considered a nuisance dust.
Some deposits contain small amounts of crystahne quartz and are therefore fibro genic.
When diatomaceous earth is calcined (with or without fluxing agents) some silica is converted to cristobalite and is therefore fibrogenic.
Aerosil 200 has never been detected in calcined batomaceous earth.
The primary hazard associated with Aerosil 200 arises from its extremely fine particle size, which allows it to become easily airborne during handling, mixing, or transferring. When inhaled, these ultrafine particles (typically 7–40 nanometers in primary size) can cause mechanical irritation to the respiratory tract, leading to symptoms such as coughing, throat discomfort, shortness of breath, or a dry sensation in the nose and throat.
Although Aerosil 200 is classified as amorphous silica, which is considered less hazardous than crystalline silica, prolonged or repeated exposure to high dust concentrations may cause lung stress or inflammation, especially in poorly ventilated environments.
Aerosil 200 is inorganic and non-flammable, its fine, fluffy particulate nature can make it combustible as a dust cloud in air under the right conditions.
If large amounts of silica dust are suspended in the air and come into contact with a strong ignition source, such as a spark or flame, it can potentially ignite and explode.
This type of dust explosion risk, while rare, is recognized in industrial environments that involve dry powder processing, pneumatic conveying, or large-scale batch mixing. Strict controls on ventilation, grounding, and dust collection systems are needed to prevent electrostatic buildup and dust cloud formation.
