General Description Uses
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Silicon dioxide

General Description Uses
Product Name
Silicon dioxide
CAS No.
7631-86-9
Chemical Name
Silicon dioxide
Synonyms
Aerosil;White carbon;NEOSYL;Dioxosilane;Geduran Si 60;SILICA GEL BLUE;Hollow glass microspheres;Silica gel 60 (0.015-0.040 mm);LICHROSORB SI 100 (10 MYM) 10 G;SILICA GEL 60 PF254 FOR PREPARATIVE LAYE
CBNumber
CB8138262
Molecular Formula
O2Si
Formula Weight
60.08
MOL File
7631-86-9.mol
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Silicon dioxide 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
Flash point:
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
pka
6.65-9.8[at 20 ℃]
Specific Gravity
2.2
color 
White to yellow
PH
5-8 (100g/l, H2O, 20℃)(slurry)
Odor
at 100.00?%. odorless
Resistivity
1∞10*20 (ρ/μΩ.cm)
Water Solubility 
insoluble
Hydrolytic Sensitivity
6: forms irreversible hydrate
Sensitive 
Hygroscopic
Crystal Structure
Trigonal
Merck 
14,8493
Exposure limits
NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3
Stability:
Stable.
CAS DataBase Reference
7631-86-9(CAS DataBase Reference)
NIST Chemistry Reference
Silicon(iv) oxide(7631-86-9)
IARC
3 (Vol. Sup 7, 68) 1997
EPA Substance Registry System
Silica (7631-86-9)
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Safety

Hazard Codes 
Xn,Xi
Risk Statements 
36/37/38-36/37-22-43-52/53-36/38
Safety Statements 
26-37/39-36-36/37/39-36/37-61
OEB
B
OEL
TWA: 6 mg/m3
HS Code 
2811221000
Toxicity
LC inhalation in rat: > 200gm/m3/1H
IDLA
3,000 mg/m3
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H317May cause an allergic skin reaction

H412Harmful to aquatic life with long lasting effects

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P272Contaminated work clothing should not be allowed out of the workplace.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P333+P313IF SKIN irritation or rash occurs: Get medical advice/attention.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
NIST2031C
Product name
Metal-on-Fused-Silica Neutral Density Filters (250 nm to 635 nm)
Purity
NIST?SRM?
Packaging
100G
Price
$13780
Updated
2024/03/01
Sigma-Aldrich
Product number
926892
Product name
MCM-41 100nm nanoparticle
Purity
pore size 30??, thiol functionalized
Packaging
15MG
Price
$350
Updated
2024/03/01
Sigma-Aldrich
Product number
926884
Product name
MCM-41 100nm nanoparticle
Purity
pore size 30??, amine functionalized
Packaging
15MG
Price
$350
Updated
2024/03/01
Sigma-Aldrich
Product number
916153
Product name
Lithiummodifiedsilicananoparticles
Purity
poresizenon-porous,400?nmparticlesize
Packaging
1G
Price
$247
Updated
2024/03/01
Sigma-Aldrich
Product number
915904
Product name
Lithiummodifiedsilicananoparticles
Purity
poresizenon-porous,600?nmparticlesize
Packaging
1G
Price
$247
Updated
2024/03/01
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Silicon dioxide Chemical Properties,Usage,Production

General Description

Silicon dioxide occurs almost everywhere on earth. It is one of the most important and abundant oxides on earth, constituting about 60% weight of the earth’s crust as silica itself or in combination with other metal oxides in silicates. It commonly is found as sand in the vast ocean and river shores, their beds, deserts, rocks, and minerals.
Silicon dioxide exists in several structural forms: polymorphic crystalline silica, synthetic quartz crystals, amorphous silica, and vitreous silica. This classification is not complete as there are other forms of silica synthesized for specialized applications.

Uses

Industry
Application
Role/benefit
Food
Powdered foods, such as salt, many spices, etc.
Ant-caking agent/ when added to a mixture, prevents its ingredients from binding together
Nutritional health food supplements
Source of silicon/maintain healthy strong bones and joints and minimizes aluminum effects on the body
Wine, beer and juice
Fining agent
Chemical manufacture
Manufacture of silicon compounds and sodium silicate
Raw material
Construction
Production of portland cement
Raw material
Sand casting
Main ingredient/high melting point
Glass
High purity silica glass
Raw material/high temperature and corrosion resistance
Domestic glass and optical devices
Essential component
Ceramics
Manufacture of ceramic glaze
Main constituents/forms glass when heated to bind others ingredients together
Metallurgy
Manufacture of silicon alloys
Raw material or additive
Pharmaceutical
Drug tablets making
Flow agent/aids powder flow when tablets are formed
Preventing Alzheimer’s disease
Effective components/minimizes aluminum effects on the body which may cause Alzheimer’s disease
Electronics
Fiber optic cables
Raw material/high level of heat conductivity and low rate of transmission loss
Wire insulation
Raw material/high melting point and good insulating property
Semi-conductors
Source of silicon
Piezoelectric transducer
Main component/can convert mechanical energy to electrical energy and vice-versa
Others
Refractory materials
Main component/high melting point and high shock resistance
Rubber and plastics
Additive/improves wearing capacity
DNA Extraction
Source of silicon/has binding properties which help to isolate the strands of DNA
Manufacture of silica gel
Source of silicon/hygroscopic property
Defoaming
Defoamer component
Silica-based aerogel
Source of silicon
Hydraulic fracturing
Thickening agent
 

Chemical Properties

white crystals or powder

Chemical Properties

Diatomaceous earth is a transparent to gray, odorless amorphous powder.

Chemical Properties

Amorphous silica, the noncrystalline form of SiO2, is a transparent to gray, odorless, amorphous powder

Physical properties

Colorless amorphous (i.e., fused silica) or crystalline (i.e., quartz) material having a low thermal expansion coefficient and excellent optical transmittance in far UV. Silica is insoluble in strong mineral acids and alkalis except HF, concentrated H3PO4, NH4 HF2 , concentrated alkali metal hydroxides. Owing to its good corrosion resistance to liquid metals such as Si, Ge, Sn, Pb, Ga, In, Tl, Rb, Bi, and Cd, it is used as crucible container for melting these metals, while silica is readily attacked in an inert atmosphere by molten metals such as Li, Na, K Mg, and Al. Quartz crystals are piezoelectric and pyroelectric. Maximum service temperature 1090°C.

Uses

silica is also known as silicone dioxide. Silica has a variety of applications: to control a product’s viscosity, add bulk, and reduce a formulation’s transparency. It can also function as an abrasive. In addition, it can act as a carrier for emollients, and may be used to improve a formulation’s skin feel. Spherical silica is porous and highly absorbent, with absorption capabilities roughly 1.5 times its weight. A typical claim associated with silica is oil control. It is found in sunscreens, scrubs, and wide range of other skin care, makeup, and hair care preparations. It has been successfully used in hypoallergenic and allergy-tested formulations.

Uses

Functionalized RAFT agent for controlled radical polymerization; especially suited for the polymerization of styrene; acrylate and acrylamide monomers. Azide group can be used to conjugate to a variety of alkyne-functionalized biomolecules. Chain Transfer Agent (CTA).

Uses

SDS mixture of sodium alkyl sulfates consisting chiefly of sodium lauryl sulfate

Uses

Silica (SiO2) (RI: 1.48) is mined from deposits of diatomaceous soft chalk-like rock (keiselghur). This is an important group of extender pigments, which is used in a variety of particle sizes. They are used as a flatting agent to reduce gloss of clear coatings and to impart shear thinning flow properties to coatings. They are relatively expensive.

Uses

Silicon(IV) oxide, amorphous is used as carriers, processing aids, anti-caking and free-flow agents in animal feed. Defoamer applications such as paint, food, paper, textile and other industrial applications. Synthetic silicon dioxides are used as a rheology control agent in plastics. It is also used to manufacture adhesives, sealants and silicones.

Uses

manufacture of glass, water glass, refractories, abrasives, ceramics, enamels; decolorizing and purifying oils, petroleum products, etc.; in scouring- and grinding-compounds, ferrosilicon, molds for castings; as anticaking and defoaming agent.

Definition

ChEBI: A silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.

General Description

contains sodium stabilizing counterion

Hazard

Not toxic if ingested, inhaled silica dust can cause silicosis; carcinogen.

Agricultural Uses

Silica is silicon dioxide, one of the most abundant materials on the earth's crust. Quartz is an example of silica. It is used as a filler in fertilizers, and also, in the manufacture of glass, ceramics, abrasives, rubber and cosmetics.

Safety Profile

The pure unaltered form is considered a nuisance dust. Some deposits contain small amounts of crystahne quartz and are therefore fibrogenic. When diatomaceous earth is calcined (with or without fluxing agents) some sdica is converted to cristobalite and is therefore fibrogenic. Tridymite has never been detected in calcined batomaceous earth. See also other silica entries

Potential Exposure

Diatomaceous earth is used as a filtering agent and as a filler in construction materials, pesticides, paints, and varnishes. The calcined version (which has been heat treated) is the most dangerous and contains crystallized silica, and should be handled as silica. See also other entries on silica

Shipping

This material is not singled out by DOT in its Performance-Oriented Packaging Standards.

Purification Methods

Purification of silica for high technology applications uses isopiestic vapour distillation from concentrated volatile acids and is absorbed in high purity water. The impurities remain behind. Preliminary cleaning to remove surface contaminants uses dip etching in HF or a mixture of HCl, H2O2 and deionised water [Phelan & Powell Analyst 109 1299 1984].

Derivatives

Precipitated silica is obtained like silica gel by acidifying an aqueous solution of sodium silicate. Precipitated silica is used as filler in rubber for automobile tires and reinforcement particulate in elastomers, and as a flatting agent in paints and coatings for improving the flatness of coatings.

Incompatibilities

Silica, amorphous is a noncombustible solid. Generally unreactive chemically. Incompatible with fluorine, oxygen difluoride, chlorine trifluoride. Soluble in molten alkalis and reacts with most metallic oxides at high temperature.

Waste Disposal

Sanitary landfill.

Silicon dioxide Preparation Products And Raw materials

Raw materials

Silica gel dilute sulphuric acid AerosilR202 (SiO2) Cyclone separator Carbon dioxide Sodium silicate Silica glass Tetrachlorosilane Silica sand Sodium carbonate

Preparation Products

3-Aminobenzylmethylamine Silicon monoxide Oxytocin adhesive RTP-801 2-Aminopyridin-4-ol Silicon carbide 2-TRIFLUOROMETHYLQUINOLINE-7-CARBOXYLIC ACID 6-Chloro-2-tetralone special adhesive 90E for ceramics 3-Nitroisonicotinic acid Dansyl chloride Calcium phosphate dibasic 5-(AMINOMETHYL)PYRIDIN-2-AMINE 1-(2,5-DIMETHYL-2H-PYRAZOL-3-YL)-ETHANONE 2-Amino-5-cyanopyridine Silicon nitride
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Silicon dioxide Suppliers

Australia 4 Austria 1 Belgium 4 Brazil 2 Canada 2 Chile 1 China 286 China Hong Kong 1 Czech Republic 2 Egypt 2 Europe 2 France 4 Germany 12 Hungary 2 India 124 Indonesia 2 Ireland 1 Italy 1 Japan 21 Malaysia 2 Mexico 1 Norway 2 Romania 1 Saudi Arabia 1 Singapore 5 Slovakia 1 South Korea 3 Spain 2 Switzerland 4 The Netherlands 1 United Arab Emirates 1 United Kingdom 15 United States 77 Global 590
Beckmann-Kenko GmbH
Tel
+49 4241 9308 88
Fax
+49 4241 9308 89
Email
info@beckmann-kenko.com
Country
Germany
ProdList
478
Advantage
62
Solvadis Deutschland gmbh
Tel
--
Fax
--
Email
info@solvadis.com
Country
Germany
ProdList
26
Advantage
58
Helm AG
Tel
--
Fax
--
Email
info@helmag.com
Country
Germany
ProdList
139
Advantage
58
Nordmann, Rassmann Gmbh
Tel
--
Fax
--
Email
info@nordmann.global
Country
Germany
ProdList
12
Advantage
58
Bilgram Chemie GmbH
Tel
--
Fax
--
Email
info@bilgram.de
Country
Germany
ProdList
58
Advantage
58
Alroko GmbH & Co KG
Tel
--
Fax
--
Email
mail@alroko.de
Country
Germany
ProdList
23
Advantage
58
Fox-Chemicals Gmbh
Tel
--
Fax
--
Email
info@foxchemicals.com
Country
Germany
ProdList
444
Advantage
58
ChemPur GmbH
Tel
--
Fax
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Email
info@ChemPur.de
Country
Germany
ProdList
2737
Advantage
50
ABCR GmbH & CO. KG
Tel
--
Fax
--
Email
info@abcr.de
Country
Germany
ProdList
6831
Advantage
75
AppliChem GmbH
Tel
--
Fax
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Email
service@applichem.de
Country
Germany
ProdList
968
Advantage
65
Service Chemical Inc.
Tel
--
Fax
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Email
sales@chemos-group.com
Country
Germany
ProdList
6350
Advantage
71
Merck Schuchardt OHG
Tel
--
Fax
--
Email
schuchardt-vertrieb@merck.de
Country
Germany
ProdList
5827
Advantage
74
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View Lastest Price from Silicon dioxide manufacturers

Hebei Andu Technology Com.,Ltd
Product
Silicon dioxide 7631-86-9
Price
US $3.50/kg
Min. Order
1kg
Purity
≥99%
Supply Ability
3000tons/month
Release date
2024-08-25
HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD
Product
Silicon dioxide 7631-86-9
Price
US $100.00-75.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
5000
Release date
2024-08-20
Hebei Zhuanglai Chemical Trading Co.,Ltd
Product
Silicon dioxide 7631-86-9
Price
US $46.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
5000kg/week
Release date
2024-05-13

7631-86-9, Silicon dioxideRelated Search:

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