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Fumed Silica Powder is used as a reinforcing filler in elastomers, mainly silicone-elastomers.
Fumed Silica Powder acts as a free flow additive in the production of technical powders, in food and feed and in pharmaceutical products.
Fumed Silica Powder is used to enhance paper sizing.
CAS Number: 112945‑52‑5 (hydrophilic fumed silica) — also sometimes 7631‑86‑9
EC / EINECS Number: 231‑545‑4
Chemical Formula: SiO₂ (synthetic amorphous silicon dioxide), molar mass ~60.08 g/mol
SYNONYMS:
Pyrogenic silica, Fumed Silica Dispersion, Silicon Dioxide, Fumed SiO2, Fumed silica, Pyrogenic silica, Colloidal silicon dioxide, Fumed silicon dioxide, Synthetic amorphous silica, Colloidal silica, Silicic anhydride, Aerosil, Cab‑O‑Sil, XYSIL, Silicon dioxide amorphous, Pyrogenic silica, Silica fume, Fumed colloidal silica, Silica, fumed, silicic anhydride, fumed silicon dioxide, Aerosil, Cab-O-Sil, Cabosil, silicon dioxide amorphous, synthetic amorphous silica, colloidal silicon dioxide, ts-100 acematt, White Carbon Black
Fumed Silica Powder, or pyrogenic silicon dioxide, is one kind of pure amorphous white inorganic powder that has a high specific surface area, nano-scale primary particle size, and a relatively high (among silica products) concentration of surface silanol groups.
The properties of Fumed Silica Powder can be chemically modified by reaction with these silanol groups.
Fumed Silica Powder (also known as pyrogenic silica and silicon dioxide) is one of the lightest substances known.
Fumed Silica Powder is very light and fluffy and have bulk densities of 3 lbs/cu ft (38 kg/cu m).
Silicon metal and alloys are produced in electric furnaces.
The raw materials include quartz, coal, and wood chips.
The smoke that results from furnace operation is collected and sold as Fumed Silica Powder.
Fumed Silica Powder is synthetic, hydrophilic amorphous silica, produced via flame hydrolysis.
Fumed Silica Powder is a white colloidal powder of high purity.
Processing: A good dispersion is a must to assure optimum performance.
Fumed Silica Powder is a nano-scale white powder produced by the high-temperature hydrolysis of silicon halide in a hydrogen-oxygen flame.
Fumed Silica Powder is an amorphous silica product with a primary particle size of 7~40nm.
The aggregate particle size of Fumed Silica Powder is about 200-500 nanometers, and the specific surface area is 100-400m2/g.
The purity of Fumed Silica Powder is high – the content of SiO2 is not less than 99.8%.
The untreated Fumed Silica Powder aggregates contain a variety of silanol groups.
In the preparation process of Fumed Silica Powder powder, silicon tetrachloride, hydrogen and air undergo high-temperature reactions in a reactor to form primary particles with a particle size of 7 to 40 nm.
Because the primary particles are extremely fine, they generate aerosols with gases, which are difficult to capture.
In order to facilitate packaging, storage and transportation, first use an agglomerator to aggregate the particles into larger particles, that is, Fumed Silica Powder powder.
Fumed Silica Powder, also known as pyrogenic silica, is a fluffy, amorphous white powder composed of 96-99.8% SiO2, 0.05-1.3% Al2O3, 0.003-0.06% Fe2O3 and 0.03% TiO2.
Fumed Silica Powder has a high specific surface area (200-390 m2/g), nanoscale primary particle size(5-40nm) and a relatively high density of surface silanol groups (1.5-4.51/nm2).
The properties of Fumed Silica Powder can be chemically modified by reacting with these silanol groups.
Fumed Silica Powder is available in a variety of types and sizes including hydrophilic, hydrophobic and food grade.
Fumed Silica Powder, often known by trade names Cabosil and Aerosil, or as colloidal silica, is a thixotropic flow modifier.
USES and APPLICATIONS of FUMED SILICA POWDER:
Fumed Silica Powder Filler – 0.25kg is applied as a thickening and thixotropic agent in many organic systems, e.g. in unsaturated polyesters, coatings, printing inks, adhesives, cosmetics and others.
Fumed Silica Powder is used as a reinforcing filler in elastomers, mainly silicone-elastomers.
Fumed Silica Powder acts as a free flow additive in the production of technical powders, in food and feed and in pharmaceutical products.
Fumed Silica Powder requires significant agitation (stirring) to become fully mixed into a resin.
Use of a mechanical stirrer will make the process quicker and easier but manual mixing is perfectly possible.
Fumed Silica Powder added to resin at a ratio of 0.7% – 1% (by weight) will produce a thixotropic resin.
2-3% will produce a gelcoat consistency.
Percentages up to 3%+ can be used to make a filler paste although additional filler powders are typically also required.
Please note the addition of Fumed Silica Powder will reduce the clarity of clear resin systems meaning it is not ideal for turning clear laminating resin into a clear gelcoat.
Fumed Silica Powder particles are very small and will become airborne as soon as the material is scooped, moved or mixed.
Always wear protective gloves and a dust mask when handling Fumed Silica Powder in its raw state.
Fumed Silica Powder has a wide range of applications in the food, chemical, pharmaceutical, cosmetic and composite industries, where it can be used as an adhesive, antifoam agent, pesticide, thickener, anticaking agent, lubricant, polishing agent, desiccant, sealant, abrasive and so on.
It can improve the thermal and mechanical properties of epoxy/Fumed Silica Powder composites.
The addition of nanosilica improves the thermal stability of the composites and slows down the pyrolysis process.
Fumed Silica Powder is combined with highly mineralised water to form polymeric fracturing fluids for fracking and oil containment applications, which effectively improves the thixotropy of highly mineralised fracking fluids and enhances the temperature resistance of highly mineralised fracking fluids.
Fumed Silica Powder was also used to deplete lipids and hormones in Taqman assays of human hepatocellular carcinoma cells HuH-7 and the human hepatocyte cell line HepG2.
As well as for the preparation of photocatalytic materials, etc.
Fumed Silica Powder is a powder composed of submicron-sized amorphous silica spheres arranged in branching chains of varying lengths.
To produce Fumed Silica Powder, silicon tetrachloride or quartz is burnded in a flame of hydrogen and oxygen to yield molten uniform-sized spheres that subsequently fuse into three-dimensional aggregates.
Though the lengths and shapes of these chains differ (lending Fumed Silica Powder an enormous external surface area), the size of the spheres themselves can be controlled during the preparation process.
Fumed Silica Powder exhibits thixotropic properties and is typically used as a dessicant, thickening and anti-caking agent, and stabilizer in pharmaceuticals, cosmetics, paints and coatings, sealants, and gel-cell batteries (as an additive to acid-based electrolytes).
American Elements can produce both hydrophilic and hydrophobic (treated) Fumed Silica Powder in a range of different sizes and surface areas.
Fumed Silica Powder is used to enhance paper sizing.
Fumed Silica Powder is a colloidal quartz material.
Depending on the processing, Fumed Silica Powder may be used as a hydrophilic or a hydroponic.
From sidewalks and foundations to paint cans, printed pages and pet litter boxes, Fumed Silica Powder's application as a universal thickening agent means it can be found in widely dissimilar places.
Slightly abrasive and light-defusing, Fumed Silica Powder is used in personal care products such as toothpaste and cosmetics.
As the Fumed Silica Powder from the connected bulk bag fills the receiving hopper beneath it, the air inside the hopper is forced out.
Unless this air passes through a filter, airborne dust particles can escape into the surrounding atmosphere.
A dust collector mounted on the discharger frame will contain the dust inside the conveyance system, lowering the risk of a potentially dangerous dusting.
This same ventilation system can also be used to de-gas the empty bulk bags after the unloading of the Fumed Silica Powder, completely deflating them and making the folding and storage or disposal of these bag a much cleaner operation.
To suppress dust during the dumping and compacting of the bulk bags, a high-velocity fan drawing dust into cartridge filters is recommended.
The filters can then be activated by an automatic reverse-pulse filter system returning the filtered dust into the receiving hopper and reducing waste.
If the Fumed Silica Powder is packaged in smaller bags, a bag dumping station with a dust hood and filtration devices may be sufficient to support the manual unloading of the material in hoppers.
A bag compactor connected to the dumping station will permit operators to pass empty bags directly to a compactor, creating a dust-contained disposal method for the empty bags.
A hopper screen above the receiving vessel will help to prevent the introduction of foreign objects and protects the operators from potentially dangerous conveying equipment.
Standard capacitive level sensors, which are necessary to prevent a conveyor system from running after the feeding hopper has been completely emptied, may be ineffective with Fumed Silica Powder.
An evaluation of both the material and the system used to handle it is recommended.
In some instances, vibrating forks and probes or rotating paddles are more reliable in sensing the levels of the Fumed Silica Powder in the vessel and in alerting operators when levels are nearing full evacuation.
This fine white powder, Fumed Silica Powder, is used to thicken adhesive and fairing mixes and reduce their flow on vertical surfaces.
Relatively small quantities added to a resin mix containing glass bubbles will give non-sag properties.
Silica is also used with micro-fibres to produce high strength, non-sagging structural adhesive.
The inclusion of Fumed Silica Powder will increase the hardness of the resulting mix, making it more difficult to sand.
For this reason silica is usually added in the minimum quantities to any mix for which sanding is anticipated.
Fumed Silica Powder is used as a reinforcing filler in elastomers, mainly silicone-elastomers.
Fumed Silica Powder Filler – 1kg is applied as a thickening and thixotropic agent in many organic systems, e.g. in unsaturated polyesters, coatings, printing inks, adhesives, cosmetics and others.
Fumed Silica Powder acts as a free flow additive in the production of technical powders, in food and feed and in pharmaceutical products.
COMMON FUNCTIONS of FUMED SILICA POWDER:
*Reinforcement,
*Transparency
*Rheology Control
*Thickening & Thixotropy
*Anti-sagging
*Anti-settling
*Anti-caking, Flow aid
*Anti-adhesion
*Thermal insulation
*Toughening
*Anti-slip
*Defoaming
*Matting
*Catalyst carrier, etc.
SYNTHESIS of FUMED SILICA POWDER:
Fumed Silica Powder can be obtained by pyrolysis.
In the pyrolysis method, silicon tetrachloride reacts with oxygen in a flame and the SiO2 seeds gradually increase in size or aggregate.
The sol-gel method is carried out in the liquid phase, and the synthesis of silica nanoparticles is carried out in the presence of silicon oxide with an acidic or basic catalyst and an alcoholic solvent.
When the reaction is carried out under alkaline conditions, it is called the Stöber method.
PACKING of FUMED SILICA POWDER:
Even after polymerization in the agglomerator, the Fumed Silica Powder powder is very fluffy and has extremely high requirements for moisture resistance.
It is difficult to package Fumed Silica Powder with traditional processes.
Vacuum packaging technology solves this problem well.
The pressure difference between the vacuum chamber and the feeding device is used to suck Fumed Silica Powder into the packaging bag so that the powder can be packaged in a sealed vacuum state, and the powder is not exposed.
in the air.
This can accurately control the weight, achieve a good moisture-proof effect, and solve the problem of dust leakage.
The disperse of Fumed Silica Powder powder
Due to the polysiloxane inside the Fumed Silica Powder and the active silanol on the outer surface, it has extremely strong water absorption, making it hydrophilic, and it is difficult to wet and disperse in the organic phase.
Moreover, due to the presence of hydroxyl groups on the surface, the surface energy is relatively large, and the aggregates tend to aggregate, which adversely affects the application performance.
In some fields that require high dispersibility, in order to achieve an ideal dispersion effect, it is necessary to use a dispersing machine and a specific dispersing process.
Hydrophobic Fumed Silica Powder is a new type of fine inorganic material with a special structure, which has almost all the superior properties of ordinary Fumed Silica Powder, and due to its hydrophobicity and special surface structure, the application field is greatly expanded.
CHARACTERISTICS AND CHALLENGES of FUMED SILICA POWDER:
Fumed Silica Powder powder has a high surface area.
Fumed Silica Powder is extremely fluffy and semi-free flowing and usually difficult to handle.
The use of a fine-dust filter respirator by material handlers is recommended.
Fumed Silica Powder is best kept as dry as possible.
Once it is wet, 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 Fumed Silica Powder.
If the Fumed Silica Powder arrives at the processing facility in bulk bags, the frames used to discharge the bags should be equipped with additional accessories designed to reduce the amount of manpower and effort necessary to transfer the Fumed Silica Powder from the bulk bag into downstream equipment.
These devices can elongate and stretch the bags, both from the top and bottom.
This makes the bag rigid, which promotes a better flow and removes any pockets of Fumed Silica Powder cornered in the bags.
Some of these bag activating devices also serve as a dust tight seal between the bulk bag and the receiving hopper.
PHYSICAL and CHEMICAL PROPERTIES of FUMED SILICA POWDER:
Appearance: White to off‑white, fluffy, odorless amorphous powder
Particle size: Primary particles ~5–50 nm forming branched agglomerates;
specific surface area typically ~175–395 m²/g (Aerosil 200 grade ~200–225 m²/g)
Bulk density: ~160–190 kg/m³ (0.16–0.19 g/cm³)
Solid density: ~2.2–2.3 g/cm³
Refractive index: n²⁰_D ≈ 1.46
Melting point: ~1,600 °C; boiling / decomposition ~2,200–2,230 °C
Solubility: Practically insoluble in water, acids (except HF) or organics;
can disperse colloidally in water; dissolves in strong alkali at elevated temperature
Hydrolytic sensitivity: Forms reversible hydrate upon moisture exposure (~5%)
pH of aqueous dispersion: ~3.7–4.5 at ~4% solids
Stability: Chemically stable, non-reactive;
avoid strong acids/bases or extreme heat conditions
Molecular Weight: 60.08
Appearance: White Powder
Melting Point: 1,600° C
Boiling Point: 2,230° C
Density: ~2.3-4.5 g/cm3
Solubility in H2O: N/A
Size Range: 5–50 nm
Specific Surface Area: 200-390 m2/g
Morphology: Spherical
Linear Formula: SiO2
Pubchem CID: N/A
MDL Number: MFCD00011232
EC No.: 262-373-8
IUPAC Name: Dioxosilane
Beilstein/Reaxys No.: N/A
SMILES: O=[Si]=O
InchI Identifier: InChI=1S/O2Si/c1-3-2
InchI Key: VYPSYNLAJGMNEJ-UHFFFAOYSA-N
FIRST AID MEASURES of FUMED SILICA POWDER:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation:
Fresh air.
*In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
*If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available
ACCIDENTAL RELEASE MEASURES of FUMED SILICA POWDER:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.
FIRE FIGHTING MEASURES of FUMED SILICA POWDER:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2)
Foam
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.
EXPOSURE CONTROLS/PERSONAL PROTECTION of FUMED SILICA POWDER:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A
-Control of environmental exposure:
Do not let product enter drains.
HANDLING and STORAGE of FUMED SILICA POWDER:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.
STABILITY and REACTIVITY of FUMED SILICA POWDER:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available
