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Silicon Dioxide Powder CAS 7631-86-9

Molecular Formula: O2Si

Formula Weight: 60.08

ZSpharmac: Silicon Dioxide Powder Raw Material Supplier

Product Name: Silicon Dioxide Powder
CAS No: 7631-86-9
Purity: 99%

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Basic Info

Product Name:Silicon Dioxide Powder
Other Names:Silicon Dioxide
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:White to Yellow Suspension
EINECS No.:231-545-4
Provide:Silicon Dioxide Powder MSDS;
Silicon Dioxide Powder COA

What is Silicon Dioxide Powder?

Silica, also known as silicon dioxide (SiO2), is the most abundant mineral found in nature, making up approximately 12% of the earth’s crust. It exists in three different crystal forms: quartz, tridymite, and cristobalite. Quartz is the most stable form at room temperature, while tridymite and cristobalite are stable at high temperatures and slowly transform into quartz at lower temperatures.

Quartz comes in various forms with different names based on its characteristics. Large, transparent quartz crystals are referred to as quartz crystals, while those containing trace impurities and appearing purple are known as amethyst. Light yellow, golden, and brown quartz are called smoky quartz, and black, almost opaque quartz is referred to as smoky quartz. Other gem-like minerals containing microcrystalline quartz mixed with other substances are chalcedony, agate, and jasper. Carnelian contains iron oxide, while chrysoprase contains magnesium. Red jasper is mixed with finely dispersed goethite (Fe2O3·H2O).

Quartz sand, commonly found as common sand, contains impurities and is widely distributed in North and South China. There are also crystal mines in several provinces such as Qinghai, Yunnan, Guangdong, Guangxi, and Guizhou. The melting point of quartz is 1610℃, and it is unreactive with halogens, hydrogen halides, and most inorganic acids, except for fluorine, hydrogen fluoride, and hydrofluoric acid. However, it is soluble in hot concentrated alkali solution and molten strong alkali or sodium carbonate.

Silicon Dioxide Powder Property

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
Fp 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
pka6.65-9.8[at 20 ℃]
Specific Gravity2.2
color White to yellow
PH5-8 (100g/l, H2O, 20℃)(slurry)
Odorat 100.00?%. odorless
Water Solubility insoluble


Silicon Dioxide Powder Uses

  1. Silicon Dioxide Powder has a wide range of applications. It is commonly used as a filler for color TV cables, wire casings, and rubber transparent bottoms. Additionally, it serves as a thickener, thixotropic agent, anti-sedimentant, matting agent, plastic opening agent, liquid drug adsorbent, and filler for cosmetics and papermaking.
  2. Furthermore, Silicon Dioxide Powder acts as a reinforcing filler for natural rubber and synthetic rubber, as well as a filler for synthetic resin, ink thickener, anti-settling agent for pigments in coatings, matting agent, soft polishing agent for vehicles and metals, and anti-settling agent in emulsifiers. It is also utilized as a pesticide carrier and a filler for lightweight newsprint.
  3. In addition, Silicon Dioxide Powder is used as an anti-caking agent and can be incorporated in powder flavor, milk powder, cocoa powder, egg powder, non-dairy fat powder, and instant coffee, among other products.
  4. Moreover, it is employed for bonding glass planes in picture tubes, projection tubes, and wave tubes, as well as a moisture-proof adsorbent for food and industrial gases. It also aids in adsorbing polymer proteins in fermented products during industrial fermentation processes.

Silicon Dioxide Powder Content Analysis

Accurately weigh about 1g of the sample that has been dried at 105°C for 2 hours, put it into a weighed platinum crucible, burn it according to the weight loss on ignition (GT-20) method, put it into a desiccator to cool, and weigh it. . Obtain the weight of the burned sample (W1). Wet the residue with 3 to 4 drops of ethanol, add 2 drops of sulfuric acid, and add enough hydrofluoric acid to cover the wet residue. Evaporate to dryness at 95-105°C on the heating plate, then add 5 ml of hydrofluoric acid, carefully rotate the crucible to wash off the material attached to the side wall, and then evaporate to dryness. Burn the dried residue on a gas lamp until it is red hot, put it into a desiccator to cool, and weigh it to obtain the weight of the residue (W2). The weight difference between the ignition sample and the residue (W1-W2) is the weight of SiO2 in the ignition sample.

Silicon Dioxide Powder Production Method

Hydrochloric acid decomposition method.
Operation method: First, combine a water glass solution with a relative density of 1.100 (the mass ratio of Na2O to SiO2 is 1:2.4~1:3.4, and a concentration of 4%~10% is appropriate) and a sodium chloride aqueous solution with a relative density of 1.060. Salt out, and then use 31% hydrochloric acid (sulfuric acid can also be used, called sulfuric acid decomposition method) to decompose, control the pH = 6 to 9.5, and precipitate particulate silica gel, which is rinsed with water, dehydrated, dried, crushed, and sieved to obtain a precipitate Silica.
Carbonization method. The silica sand and soda ash are melted at high temperature, the melt is dissolved, carbon dioxide gas (containing 30% to 35% CO2) is introduced for carbonization and neutralization for 6 to 8 hours, washed with water, and sulfuric acid is added to adjust the pH value to 6 to 8 for the second washing. , dehydrate, dry to moisture content ≤ 6%, crush into 200~350 mesh to obtain the finished product of precipitated Silicon Dioxide Powder.
Rice husk method. The rice husk is carbonized under strictly controlled temperature conditions to remove organic matter in the rice husk and prevent the hydrated silica in the rice husk from being destroyed. The carbonized rice husk is boiled in a certain concentration of sodium carbonate aqueous solution at normal pressure and temperature to dissolve the hydrated silica in the carbonized rice husk. The dissolution rate can reach 90%. The dissolved hydrated silica is filtered. , washed, and spray-dried to obtain the finished product of precipitated Silicon Dioxide Powder.

About Products:
If you need the cosmetic raw material Silicon Dioxide Powder, please contact our service staff directly, we will provide you with high-quality products at the best price.
As an experienced Silicon Dioxide Powder manufacturer and supplier, our company, ZSpharmac will provide Silicon Dioxide Powder raw materials to customers around the world for a long time.
Over the years, the company has adhered to the spirit of “integrity management, strict quality control, and customer first” and has won unanimous praise from customers at home and abroad.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Cosmetic raw materials
  • Products/Service:Cosmetic raw materials (flavors and fragrances,antioxidant products, moisturizing and hydrating, whitening agents, cosmetic additives)
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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