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High Purity Silicon Si powder CAS 7440-21-3, 99%

What is silicon powder?

Silicon powder can be used as an organic non-metallic inorganic material that is non-toxic and odorless. Silicon powder has excellent resistance to temperature, corrosion resistance against acid and alkali, and high insulation.
Purity(%): >99.95

APS 30(nm), 50nm, 100nm

Silicon Si powder CAS 7440-21-3
Silicon Si powder CAS 7440-21-3

Feature of Silicon powder:

Silicon fume also known by microsilicon is an industrial process that smelts industrial silicon in an electric furnace at high temperature. Special collection devices are used to collect the dust and smoke that is released with the exhaust gas. Become.

silicon powder has the scientific name “micro silicon” or “silicon”. It is produced by high-temperature smelting industrial silicon and ferrosilicon using an industrial electric furnace. Special traps are used to collect the smoke and dirt that is released from exhaust gas. About 90% of total dust and smoke emitted from exhaust gas is SiO2. The particle size of silicon powder is small. It is also very tiny.

Silicon a non-toxic and odorless inorganic nonmetallic material. It has excellent temperature resistance, alkali and acid corrosion resistance, high frequency coefficient, high insulation and low expansion. pure Silicon powder can be used widely in chemical, electronics and integrated circuits.

The second most abundant element is silicon, which has a concentration of 277,000ppm. It is usually found as silicate which can be found in numerous rocks, clays, soils. By combining silicon dioxide (sand or SiO 2) and carbon, you can obtain Silicon. By using zone refining components that are used for high-purity purposes (such semiconductor devices), they can be further purified and their purity improved to better than 1:109. There are two types of silicon. While brown silicon can be considered a powder or metal, the white crystalline (metal), silicon is generally more popular. Lump silicon does not react with water, oxygen or acids (except HF), however it can be dissolved in hot alkali.

Silicon can be used in many industries. Due to its unique semiconductor properties, the semiconductor industry uses ultra-high purity silica. Some alloys also use silicon as an alloying element, like ferrosilicon (an alloy of iron with silicon that is used to add silicon into steel or cast iron). It can also be used for glass production.

The morphology and structure of elemental silica includes monocrystalline Silicon, and Amorphous Silicon.

If you are interested in buying silicon powder bulk, please send us an inquiry.

Parameter of Silicon Si Si powder CAS 7440-21-3

Descriptions of Nano Silicon Powder

nano silicon powder APS(nm): 2-1000nm

nano silicon powder Purity(%): >99.95

Nanosilicon powder Specific surface area (m2/g) 60

nano silicon powder Volume density(g/cm3): 0.09

nano silicon powder Density(g/cm3): 2.3

nano silicon powder Crystal form: Sphere

Colour: Yellow

nano silicon powder CAS No. : 7440-21-3

nano silicon powder EINECS No. : 231-130-8

Silicon powder performance

It is high in purity. The scattered performance is excellent, and the particle size is small. Because of the large surface area, pine installations the low density, good activeness, and other characteristics. A nanometer-sized silicon can be combined with graphite to make lithium battery’s cathode materials. It may also include a nanometer carbon tube, nanometer titanium trides, or other compounds. These may improve lithium battery’s performance and service life. The new generation electro-optic semiconductor material has the high gap energy.

How is Silicon Si Powder manufactured?

Reducing quartzite and sand with high purity coke produces silicon that is 96-99% pure. In an electric arc furnace, the reduction occurs. Any excess SiO2 can be used to keep the silicon carbide (SiC), from accumulating.

SiO2 + 2 C-Si+ 2 CO

2 SiC+ SiO2 -3 Si+2 CO

This is known as the carbothermal removal of silicon dioxide. It’s usually done in the presence of scrap ferrous iron. The iron contains small amounts of sulfur and phosphorus, and thus forms ferrosilicon. Ferrosilicon (iron-silicon alloy) is a mixture of iron and silicon that contains different levels of elemental iron. It accounts for approximately 80% world elemental Silicon production. Ferrosilicon can be found in the steel industry. This alloy is used primarily as an additive to iron and steel. As shown below, another possible reaction is called thermite-reduction of silica.

3 SiO 2 + 4 Al-3 Si + 2 Al 2 O 3

A mixture of water and 96-97% pure powdered silicon can yield approximately 98.5% silicon that is suitable for the chemical industry. To achieve higher purity for semiconductor applications however, it is necessary to reduce tetrachlorosilane or trichlorosilane. While the first is produced by chlorinating waste silicone, the second is an by-product from organic silicon production. Because these compounds are volatile they can be removed by multiple fractional distillation. They then become elemental silicon when reduced with very pure zinc as a reducer. This produces sponge-like silicon wafers that are meltable and can then be grown into single crystals. These are then further refined using zones. Silane or Tetraiodosilane can also be used (SiI4).

An alternative method to reduce sodium fluorosilicate is to use metallic sodium, which is a commonly used waste product of the phosphoric acids fertilizer industry. It is exothermic so it does not need any external fuel. Ultra-fine Silicon has a greater purity than other materials. In order to produce transistors, it is necessary that the impurity of silicon crystals be lower than 10 percent in 10 1 parts. Also, if you are obtaining ultra-fine silicon under certain circumstances, then the impurity content must not exceed 12 percent in 101 parts.

Application o Silicon Si powder :

Finely processing silicon powder involves crushing, grinding, polishing, and grading. The powder has a high purity, white colour, and reasonable particle size. This unique material has a broad range of applications.

Silica fume, an effective active admixture that can dramatically improve concrete’s strength, impermeability and frost resistance, is a great choice. Silica fume concrete has attracted attention due to its unique properties. This concrete can be used for water conservation and hydropower, bridge engineering, construction engineering, and highway engineering.

(1) High insulation: Because of the purity and stability of the silicon powder, as well as the excellent electrical insulation the cured product is very resistant to arcing and insulation.

(2) The exothermic peak temperature for the curing of epoxy resin can be reduced, the linear expansion coefficient and shrinkage rates of the cured products can also be decreased. This reduces the internal stress in the product and helps to prevent cracking.

(3) It is resistant to corrosion. Silica powder doesn’t react well with many acids and alkalis. Because its particles are uniformly distributed over the surface of an object, it is strong in resisting corrosion.

(4) A reasonable particle gradation allows for the reduction and elimination of precipitation and delamination in use. This can improve wear resistance, tensile strength, compressive strength, thermal conductivity, as well as the product’s resistance to heat. Combustion performance.

(5) Silica powder with silane coupling agents has good wettability and adsorption performance.

Sixth, Silica powder can be used to fill the organic resin. It not only increases the product’s performance but it also lowers its cost.

Storage Conditions for Silicon Powder

It is important to keep this product in a dry, cool environment.

Packaging silicon powder

Vacuum packaging of nanosilicon powder, 1kg/bag or as requested

Fluffylogic advanced materials Nano Technology Co. Ltd., (Fluffylogic), is a reliable global supplier and manufacturer. With over 12-years of experience, Fluffylogic has been providing high-quality chemical products and Nanomaterials including Boride, Nitride, Graphite, Sulfide, 3D printing powders, as well as boride, nitride, graphite, and sulfide.

Send us an inquiry if you’re interested in high-quality silicon powder. (brad@ihpa.net)

Silicon Si powder Properties

Additional Names
Silicon Si powder, Si, Si powder, nano silicon powder

Compound Formula

Molecular Weight
28.08 g/mol

You can choose to be brown or you could go silvery.

Melting Point

Boiling Point



Electrical Resistivity
3-4 microhm-cm @ 0 degC

Poisson’s Rate
0.064 – 0.28

Specific Heat
0.168 Cal/g/K @ 25 degC

Thermo Conductivity
1.49 W/cm/K at 298.2K

Thermal Expansion
(25 degC) 2.6 um*m-1*K-1

Young’s Module
51-80 GPa

Exact Weight


Silicon Si powder Health & Safety Information

Safety Notice

Hazard Statements

Hazard Codes

Risk Codes

Safety statements


Transport Information
UN 1346 4.1/PG3


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