Description

Chemical Name：Silicon dioxide powder

Molecular Formula: O₂Si
Molecular Weight: 60.08
Structural Formula:

Specification：

Items	Specifications
Melting point	>1600°C (lit.)
Boiling Point	>100°C (lit.)
Density	2.2–2.6 g/mL at 25°C
Vapor pressure	13.3 hPa at 1732°C
Refractive index	1.46
Flash point	2230°C
Acidity coefficient (pKa)	6.65–9.8 [at 20°C]
Solubility	Practically insoluble in water and inorganic acids except hydrofluoric acid. It is soluble in hot solutions of alkali metal hydroxides.

Function of Silicon dioxide powder：

1. Structural support and reinforcement: providing mechanical support for materials and enhancing wear resistance and impact resistance.
2. Adsorption and purification: The porous structure can adsorb water, gases, or impurities.
3. High-temperature resistance and insulation: High-temperature resistance and excellent electrical insulation properties make it suitable for high-temperature environments and electronic insulation applications.
4. Anti-caking and rheology modification: Silicon dioxide powder can reduce particle agglomeration, improving the flowability and stability of fluids.
5. Optical and catalytic: High transparency makes it suitable for optical devices; nano-sized particles can serve as catalyst carriers to enhance reaction efficiency.

Application of Silicon dioxide powder：

1. Silica is used in the production of flat glass and specialty glass.
2. Silicon dioxide serves as a filler and auxiliary material in coatings and building materials.
3. Silicon dioxide powder can used as a fluxing agent in steel smelting to remove impurities.
4. SiO2 is manufactured into sandpaper and grinding wheels for metal and wood grinding and polishing.
5. Silicon dioxide powder is mixed into dental resin for dental filling materials.
6. Silica can be used as a filler to enhance the hardness and impact resistance of plastics, used in automotive components, appliance housings, etc.
7. High-purity silica is used in the production of refractory bricks and ceramic crucibles, capable of withstanding high-temperature furnace environments; it is also used in semiconductor chip packaging materials, electronic tube housings, and other electronic insulating materials.
8. Porous SiO2 gel is used for moisture-proof drying in food, pharmaceuticals, and electronic products; it can also adsorb harmful gases from industrial exhaust gases.
9. Adding nano-silica to tire materials improves wear resistance, aging resistance, and reduces rolling resistance; it can also serve as a catalyst carrier in chemical synthesis reactions.
10. Silicon dioxide powder is used in telescope lenses, spectrometer prisms, and optical fiber cores (optical signal transmission carriers) for fiber optic communications.
11. Food-grade Silicon dioxide powder is used as an anti-caking agent in powdered foods such as infant formula, protein powder, and spices.
12. High-temperature-resistant silica fibers are used as thermal insulation materials in spacecraft to withstand extreme temperatures.
13. Modified SiO2 can adsorb heavy metal ions or oil contaminants from water and is used in wastewater treatment.

Product Packaging and Transportation Show：

FQAs:

• Q1:What kind of packaging do the products usually come in?
  A: This depends on the specific form of the product.
  a1：If the product is in powder form, it is usually packed in 25kg woven bag/25kg cardboard drum, samples are usually bagged .
  a2：If the product is liquid, it is usually packed in 180kg plastic drum/200kg iron drum, and the samples are usually in bottles.
  a3：If customers have special requirements, please inform us in advance, we will choose the most suitable packaging according to the actual situation.
• Q2:What is your shipping method?
  A1：Usually, we will send small goods by FedEx, UPS and other international courier; bulk goods can be selected by sea, air or sea-land transport and other ways.
  A2：If you have a designated courier or logistics channel, please be sure to inform us in advance so that we can arrange according to your requirements.
• Q3: What methods can customers pay?
  A: We offer a variety of payment methods, including TT transfer and credit card payment, which you can choose according to your needs.
• Q4: What is your delivery time?
  A: The exact delivery time will be determined according to the product category and quantity in your order.
• Q5: If you have any questions or needs, please feel free to contact us, we will be happy to provide you with satisfactory service!

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