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Hydrophilic Fumed Silica Powder is a light, loose, bluish-white-colored, odorless, tasteless, amorphous powder.
Hydrophilic Fumed Silica Powder is a silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.
Hydrophilic Fumed Silica Powder may be synthesized by high temperature hydrolysis of SiCl4 in O2(N2)/H2 flame.
CAS Number: 7631-86-9
Molecular Formula: O2Si
Molecular Weight: 60.08
EINECS Number: 231-545-4
Synonyms: Silicon Dioxide, Silica, Dioxosilane, Quartz, 7631-86-9, Silica gel, Cristobalite, Silicic anhydride, Tridymite, 14808-60-7, Sand, 112945-52-5, 61790-53-2, 112926-00-8, KIESELGUHR, Diatomaceous silica, Wessalon, Aerosil, Silicon(IV) oxide, Zorbax sil, 60676-86-0, Silica, amorphous, 14464-46-1, Dicalite, Ludox, Nyacol, Amorphous silica, QUARTZ (SIO2), Cristobalite (SiO2), Cab-O-sil, Sillikolloid, Extrusil, Santocel, Sipernat, Superfloss, Acticel, Carplex, Neosil, Neosyl, Porasil, Silikil, Siloxid, Zipax, Aerosil-degussa, Silicon oxide, Aerosil 380, Synthetic amorphous silica, Quartz sand, Rose quartz, Silica particles, 91053-39-3, Cab-o-sil M-5, Silica, fumed, Snowtex O, Silica, colloidal, Tokusil TPLM, Dri-Die, SILICA, VITREOUS, Manosil vn 3, Colloidal Silicon Dioxide, Ultrasil VH 3, Ultrasil VN 3, Aerosil bs-50, Carplex 30, Carplex 80, Snowtex 30, Zeofree 80, Aerosil,Silicon(IV) oxide, Zorbax sil, 60676-86-0, Silica, amorphous, 14464-46-1, Dicalite, Ludox, Nyacol, Amorphous silica, QUARTZ (SIO2), Cristobalite (SiO2), Cab-O-sil, Sillikolloid, Extrusil, Santocel, Sipernat, Superfloss, Acticel, Carplex, Neosil, Neosyl, Porasil, Silikil, Siloxid, Zipax, Aerosil-degussa, Silicon oxide, Aerosil 380, Synthetic amorphous silica, Quartz sand, Rose quartz, Silica particles, 91053-39-3, Cab-o-sil M-5, Silica, fumed, Snowtex O, Silica, colloidal, Tokusil TPLM, Dri-Die, SILICA, VITREOUS, 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, 68855-54-9, Nalfloc N 1050, Quso 51, Silica, amorphous fused, Nalco 1050, Quso G 30, Hydrophobic silica 2482, Kieselsaeureanhydrid,fused, Suprasil W, Vitreosil IR, Borsil P, Dioxide, Silicon, Silane, dioxo-, Crystallized Silicon Dioxide, Optocil (quartz), CP-SilicaPLOT, Sand, Sea, Silicon oxide, di- (sand), 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, Tridymite (SiO2), Fumed silica, crystalline-free, Stishovite (SiO2), ED-C (silica), Fuselex ZA 30, As 1 (silica), CCRIS 2475, DQ12, Agate (SiO2), Celite 545, Fumed synthetic amorphous silica, Silica, crystalline - tridymite, FB 5 (silica), Fuselex RD 120, Corning 7940, Microcrystalline quartz, Synthetic amorphous silica, fumed, Denka F 90, Denka FB 30, Denka FB 44, Denka FB 74, Denka FS 30, Dri-Die 67, Silica gel spherical, 40-75 mum particle size, WGL 300, Cryptocrystalline quartz, FB 20 (silica), Elsil 100, F 44 (filler), D & D, SF 35, Elsil BF 100, F 125 (silica), F 160 (silica), Fuselex RD 40-60, Silica, amorphous, fused, Silica; Silica colloidal anhydrous; Silicium dioxide, EINECS 238-455-4, EINECS 238-878-4, EINECS 239-487-1, 43-63C, HK 400, TGL 16319, Silica, crystalline quartz, Silicon Dioxide (vitreous), Silica, amorphous, fumed, cryst.-free, Silica, crystalline, quartz, Silica, crystalline: quartz, tripolite, GP 7I, Precipitated amorphous silica, Chrysoprase, Ronasphere, Silica, crystalline tridymite, Speriglass, Carneol, Citrine, Kieselgel, NaturasilScars, Sandstone, Silica, crystalline - quartz, Silicea, Spherica, AF-SO 25R, Quartz [Silica, crystalline], Siilca, Zorbax, quartz-glass, silica sand, Silicom dioxide, Silica flour (powdered crystalline silica), Silica marina, Silica, crystalline: tridymite, silica-gel, Fused-silica, pyrogenic silica, Silica,fumed, GP 11I, RD 8, silica-, Fine grain sand, QuarZ, Super-cel, Fire Agate, Greensil K, Sea sand, silica gel white, W 006, Silicon di-oxide, Tridymite [Silica, crystalline], Zelec Sil.
Hydrophilic Fumed Silica Powder is a type of silicon dioxide characterized by extremely small, amorphous particles that possess a high surface area and have not undergone surface treatment to repel water, meaning they readily absorb and interact with moisture.
Hydrophilic Fumed Silica Powder, which is chemically modified to repel water, hydrophilic fumed silica naturally attracts water molecules due to the presence of silanol (Si–OH) groups on its surface, making it highly compatible with aqueous systems.
Produced by flame hydrolysis of silicon tetrachloride in a high-temperature hydrogen-oxygen flame, Hydrophilic Fumed Silica Powder consists of tiny, non-porous primary particles that aggregate into chain-like clusters, giving the powder a low bulk density and unique rheological properties.
These properties enable it to act as a thickener, anti-caking agent, and suspending additive in liquids and powders where water compatibility is important.
Hydrophilic Fumed Silica Powder is a nanomaterials with strong hygroscopicity(absorbing moisture).
This fluffy white powder is based on high purity amorphous silica.
Hydrophilic Fumed Silica Powder is can be wetted by water, and dispersed in water forming a suspension.
When it firstly produced from oxyhydrogen flame，the moisture content is very low.
If exposed into air for about 30 seconds to 180 seconds, this number will be double or even tripled.
In chemical terms, the loose white silicone powder consists of highly pure amorphous silicon dioxide.
Hydrophilic Fumed Silica Powder is wetted by water and can be dispersed in water.
They have good temperature resistance, chemical resistance and thixotropic properties.
Hydrophilic Fumed Silica Powder, a reliable silicone manufacturing company, are widely used in adhesives & sealants, silicone elastomers, coatings & inks, composites, personal care cosmetics and fire extinguisher.
Hydrophilic Fumed Silica Powders are used to for rheology control (thickening, anti-sag, anti-setting, thixotropy), reinforcing (improve strength).
Hydrophilic Fumed Silica Powder provide good scratch and abrasion resistance, free-flow and anti-caking, corrosion resistance, and enhanced adsorbency.
Hydrophilic Fumed Silica Powder is amorphous in nature and possesses very high specific area.
Because of its hydrophilic nature, this type of fumed silica disperses well in water-based formulations and forms a three-dimensional network that increases viscosity and stabilizes emulsions and suspensions by preventing the settling of particles or separation of components.
This makes it especially useful in paints, coatings, adhesives, cosmetics, pharmaceuticals, and food products where water is a primary solvent or medium.
Its ability to control flow behavior and improve mechanical strength without significantly affecting clarity or texture has led to widespread use in industries requiring enhanced stability and performance in water-rich environments.
Additionally, Hydrophilic Fumed Silica Powder is chemically inert, thermally stable, and non-toxic, which further broadens its range of applications.
The micro droplets of amorphous silica fuse into a branch and form a chain like agglomerate.
Hydrophilic Fumed Silica Powder has a very strong thickening effect.
The particles are non-porous and have a surface area of 50–600 m2/g the density is 160–190 kg/m3.
Hydrophilic Fumed Silica Powder serves as a universal thickening agent and an anticaking agent (free-flow agent) in powders.
Hydrophilic Fumed Silica Powder, it serves as a desiccant.
Hydrophilic Fumed Silica Powder is used in cosmetics for its light-diffusing properties.
Hydrophilic Fumed Silica Powder 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.
Hydrophilic Fumed Silica Powder readily forms a network structure within bitumen and enhances its elasticity.
Hydrophilic Fumed Silica Powder is made from flame pyrolysis of silicon tetrachloride or from quartz sand vaporized in a 3000 °C electric arc.
Major global producers are Evonik (who sells it under the name Aerosil), Cabot Corporation (Cab-O-Sil), Wacker Chemie (HDK), Dow Corning, Heraeus (Zandosil), Tokuyama Corporation (Reolosil), OCI (Konasil), Orisil (Orisil) and Xunyuchem(XYSIL).
Hydrophilic Fumed Silica Powderis a nanomaterial with strong hygroscopicity(absorbing moisture).
This fluffy white powder is based on high purity amorphous silica.
Hydrophilic Fumed Silica Powder is can be wetted by water, and dispersed in water forming a suspension.
Melting point: >1600 °C(lit.)
Boiling point: >100 °C(lit.)
Density: 2.2-2.6 g/mL at 25 °C
vapor pressure: 13.3hPa at 1732℃
refractive index: 1.46
Flash point: 2230°C
storage temp.: 2-8°C
solubility: Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
form: suspension
pka: 6.65-9.8[at 20 ℃]
Specific Gravity: 2.2
color: White to yellow
PH: 5-8 (100g/l, H2O, 20℃)(slurry)
Odor: at 100.00?%. odorless
Water Solubility: insoluble
Hydrolytic Sensitivity 6: forms irreversible hydrate
Sensitive: Hygroscopic
Merck: 14,8493
Exposure limits NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3
Stability: Stable.
Hydrophilic Fumed Silica Powder’s surface chemistry is dominated by silanol (Si–OH) groups, which enable strong hydrogen bonding with water molecules, resulting in excellent wettability and dispersibility in aqueous systems.
This intrinsic affinity for water allows it to form stable, gel-like networks within liquids, which significantly increase viscosity and improve the suspension of pigments, fillers, and other solid particles, preventing them from settling or clumping over time.
Hydrophilic Fumed Silica Powder is valued because of its extremely small particle size, typically in the range of 7 to 40 nanometers, and its high specific surface area, which can be as large as 200 m²/g or more.
These properties make it highly effective at modifying the flow, texture, and mechanical characteristics of many materials.
When dispersed in liquids, Hydrophilic Fumed Silica Powder forms a three-dimensional network that significantly increases viscosity without greatly increasing weight, which is especially useful in products like paints, coatings, and cosmetics where smooth application and stability are important.
Because Hydrophilic Fumed Silica Powder is amorphous rather than crystalline, it is generally considered less hazardous to human health than crystalline silica, although inhalation of fine dust should still be avoided.
Because it is not surface-treated, hydrophilic fumed silica maintains its natural tendency to absorb moisture from the environment, which can influence processing and storage conditions, requiring careful handling to avoid unwanted agglomeration or caking.
Its low bulk density and fine particle size mean it can be easily aerosolized, so precautions such as dust masks or ventilation are recommended during handling to reduce inhalation risks.
Industrially, Hydrophilic Fumed Silica Powder is valued for its ability to enhance the thixotropic behavior of water-based paints and coatings, allowing them to be applied smoothly while resisting sagging or dripping once applied.
In adhesives and sealants, it improves mechanical strength and controls flow, enabling more precise application and stronger bonds.
In personal care and pharmaceutical products, Hydrophilic Fumed Silica Powder is used to stabilize suspensions and emulsions, providing a desirable texture and preventing separation, while also acting as a mild abrasive in toothpaste formulations.
Its inert nature and biocompatibility make it suitable for these sensitive applications.
Furthermore, Hydrophilic Fumed Silica Powder is employed in food products as an anti-caking agent to maintain free-flowing properties in powdered ingredients, where its compatibility with moisture is crucial to prevent clumping.
Its broad thermal stability allows it to function effectively under a wide range of temperatures without degradation.
Hydrophilic Fumed Silica Powder is best kept as dry as possible.
Once it is wet, Hydrophilic Fumed Silica Powder becomes very slimy and is extremely hard to handle as a heavy precipitate.
Precautionary measures to prevent static discharges are also integral to the safe movement of Hydrophilic Fumed Silica Powder.
Uses Of Hydrophilic Fumed Silica Powder:
Hydrophilic Fumed Silica Powder is mainly used to provide thixotropic properties in coating and adhesive; to provide reinforcement in silicone rubber.
Besides, it acts as free flow and absorbing agent in pharmacy, food and cosmetic products.
Hydrophilic fumed silica powder is extensively used as a rheology modifier and thickening agent in water-based paints and coatings, where its ability to form a stable three-dimensional network within the liquid helps to control viscosity, prevent pigment settling, and improve application properties such as sag resistance and smoothness.
In adhesives and sealants, this type of Hydrophilic Fumed Silica Powder enhances mechanical strength and controls flow behavior, enabling precise application and improved bonding performance while maintaining the stability of water-based formulations.
The cosmetics and personal care industries rely on Hydrophilic Fumed Silica Powder for stabilizing emulsions and suspensions in products like lotions, creams, and makeup, where it contributes to a smooth, silky texture and prevents separation of ingredients over time.
Its high purity and inertness also make it suitable as a gentle abrasive in toothpaste and as a matting agent in powders.
Pharmaceutical formulations incorporate Hydrophilic Fumed Silica Powder as a suspending agent and flow enhancer, improving the uniformity and stability of liquid medicines, topical creams, and powders to ensure consistent dosing and efficacy.
In the food industry, Hydrophilic Fumed Silica Powder is used as an anti-caking agent in powdered products such as spices, powdered milk, and dry drink mixes, where its moisture-absorbing properties prevent clumping and maintain free-flowing characteristics even in humid conditions.
Hydrophilic Fumed Silica Powder is also employed in silicone rubber and elastomer formulations as a reinforcing filler, where it improves mechanical strength, durability, and resistance to deformation without compromising flexibility.
Furthermore, it finds applications in water-based inks, detergents, and cleaning products, where it acts as a thickener and stabilizer, improving product consistency and performance during storage and use.
Hydrophilic Fumed Silica Powder has interesting thickening and thixotropic properties, and an enormous external surface area.
Hydrophilic Fumed Silica Powder is produced by a vapor phase hydrolysis process using chlorosilanes or substituted silanes such as, silicon tetrachloride in a flame of hydrogen and oxygen.
This material is formed and collected in a dry state.
Hydrophilic Fumed Silica Powder contains no detectable crystalline silica.
Hydrophilic Fumed Silica Powder is widely used in pharmaceuticals, cosmetics, and food products.
Its small particle size and large specific surface area give it desirable flow characteristics that are exploited to improve the flow properties of dry powders in a number of processes such as tableting and capsule filling.
Hydrophilic Fumed Silica Powder is also used to stabilize emulsions and as a thixotropic thickening and suspending agent in gels and semisolid preparations.
With other ingredients of similar refractive index, transparent gels may be formed.
The degree of viscosity increase depends on the polarity of the liquid (polar liquids generally require a greater concentration of colloidal silicon dioxide than nonpolar liquids).
Viscosity is largely independent of temperature.
However, changes to the pH of a system may affect the viscosity1.
In aerosols, other than those for inhalation, Hydrophilic Fumed Silica Powder is used to promote particulate suspension, eliminate hard settling, and minimize the clogging of spray nozzles.
Hydrophilic Fumed Silica Powder is also used as a tablet disintegrant and as an adsorbent dispersing agent for liquids in powders.
Hydrophilic Fumed Silica Powder is frequently added to suppository formulations containing lipophilic excipients to increase viscosity, prevent sedimentation during molding, and decrease the release rate.
Hydrophilic Fumed Silica Powder is also used as an adsorbent during the preparation of wax microspheres; as a thickening agent for topical preparations; and has been used to aid the freeze-drying of nanocapsules and nanosphere suspensions.
Safety Profile Of Hydrophilic Fumed Silica Powder:
Hydrophilic Fumed Silica Powder poison by intraperitoneal, intravenous, and intratracheal routes moderately toxic by ingestion.
An inhalation hazard much less toxic than crystalhe forms.
Questionable carcinogen with experimental carcinogenic data mutation data reported.
Hydrophilic Fumed Silica Powder is widely used in oral and topical pharmaceutical products and is generally regarded as an essentially nontoxic and nonirritant excipient.
However, intraperitoneal and subcutaneous injection may produce local tissue reactions and/or granulomas.
Hydrophilic Fumed Silica Powder should therefore not be administered parenterally.
Hydrophilic fumed silica powder, while generally considered to have low toxicity, presents certain hazards primarily related to its physical form as a very fine, respirable dust.
Inhalation of airborne particles can cause irritation to the respiratory tract, leading to symptoms such as coughing, sneezing, and shortness of breath, especially when exposure occurs in poorly ventilated environments or over prolonged periods.
Because of its extremely small particle size and low bulk density, the powder can easily become suspended in the air during handling, increasing the risk of inhalation and potential respiratory discomfort.
Although Hydrophilic Fumed Silica Powder is amorphous and does not carry the same severe health risks as crystalline silica, such as silicosis, repeated or chronic inhalation of fine dust should still be avoided to minimize lung irritation.
Contact with the skin or eyes may cause mild irritation or dryness, due to the powder’s strong moisture-absorbing properties, which can strip natural oils and moisture from the skin or mucous membranes.
Protective measures such as gloves, safety goggles, and dust masks are recommended during handling to reduce the risk of irritation and accidental exposure.
