Silicon Dioxide

Product Details

CasNo： 14464-46-1

MF： O2Si

Appearance： powder

Delivery Time： 15 days

Packing： 25kg/bag

Purity： 99%

• Basic Information
  • Chemical Formula: SiO₂
  • Crystal Structure: In crystalline silicon dioxide, silicon atoms and oxygen atoms are arranged in a long - range ordered manner. In amorphous silicon dioxide, they are arranged in a short - range ordered or long - range disordered manner. The silicon atom is located at the center of a regular tetrahedron, and four oxygen atoms are located at the vertices, and the tetrahedrons are connected through the oxygen atoms at the vertices.
  • Appearance and Properties: Pure natural silicon dioxide crystal is a hard, brittle, insoluble, colorless and transparent solid.
  • Melting Point: 1723℃
  • Boiling Point: 2230℃
  • Solubility: Insoluble in water and acids except hydrofluoric acid, slightly soluble in KOH solution.
• Product Classification
  • Silica Sand: It is a granular material with quartz as the main mineral component, with a particle size of 0.020mm - 3.350mm. It can be divided into ordinary silica sand, refined silica sand and high - purity silica sand. The silicon dioxide content in ordinary silica sand is between 90% and 99%; that in refined silica sand is between 99% and 99.5%; and that in high - purity quartz sand is between 99.5% and 99.9%.
  • Fumed Silicon Dioxide: Such as Wacker fumed silicon dioxide N20, it is a hydrophilic amorphous silicon dioxide synthesized artificially, prepared by the flame hydrolysis method, and is a fluffy white powder.
• Performance Characteristics
  • High Chemical Stability: The silicon - oxygen covalent bond has a very high strength, so it has good chemical stability and is not easy to react with other substances.
  • Good Electrical Insulation: It can be used as an excellent electrical insulation material and is widely used in the electronics field.
  • Strong Wear Resistance: It has high hardness and wear resistance, and can be used to make grinding materials.
• Main Applications
  • Pharmaceutical Field: It can be used as a lubricant, disintegrant, micro - encapsulation material or desiccant, and can also be used as a filter aid and clarifying agent.
  • Food Field: It is commonly used as an anti - caking agent, suspending agent, defoaming agent, etc., to prevent the aggregation and caking of powdery or crystalline foods and maintain their fluid state.
  • Cosmetics Field: Hemispherical silicon dioxide can absorb oil, control oil, and can also enhance the soft - focus effect, improve skin wrinkles, and increase the sun protection value.
  • Paper - making Field: As a filler, it can improve the whiteness of paper and lighten the quality of paper. It is also the preferred pigment for color - ink - jet paper coatings.
  • Construction Field: It is the main component of construction glass. Nano - sized fumed silicon dioxide particles can be used as anti - aging agents in rubber and asphalt adhesives.
  • Electronics Field: The silicon dioxide film plays a key role in the manufacturing of silicon - based micro - electronic chips, and can be used as a mask, passivation and protective film. High - purity silicon dioxide is also used to manufacture optical fibers for communication.
• Packaging Specifications: Common packaging specifications are 1kg, 10kg, 25kg, etc. For example, Wacker fumed silicon dioxide N20 has a packaging of 10kg/bag and 160kg/pallet.
• Price Information: The price varies according to factors such as purity, particle size, use and packaging specifications. For example, the starting price of food - grade silicon dioxide on ChemicalBook is 15 yuan for a 1kg order, 12 yuan for a 25kg order, and 10 yuan for a 1000kg order.