Silicon dioxide

ChemicalBook > CAS DataBase List > 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, NH₄HF₂, 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

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View Lastest Price from Silicon dioxide manufacturers

HebeiShuoshengImportandExportco.,Ltd

Product: silicon dioxide 7631-86-9
Price: US $6.00/kg
Min. Order: 1kg
Purity: 99%
Supply Ability: 2000KG/Month
Release date: 2024-08-02

Watson Biotechnology Co.,Ltd

Product: Silicon Dioxide 7631-86-9
Price: US $0.00-0.00/kg
Min. Order: 1kg
Purity: 99%
Supply Ability: 20MT
Release date: 2024-07-31

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

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Silicon(IV) oxide, 50% in H

Silicon(IV) oxide, 1.5 micron

LUDOX# CL-X COLLOIDAL SILICA, 45 WT. % SUSPENSION IN WATER

LUDOX#-50 COLLOIDAL SILICA, 50 WT. % SUSPENSION IN WATER

FLASH C18 SILICA 100GM BULK

LUDOX#-40 COLLOIDAL SILICA, 40 WT. % SUSPENSION IN WATER