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Silicon dioxide structure
Silicon dioxide structure

Silicon dioxide

Iupac Name:dioxosilane
CAS No.: 7631-86-9
Molecular Weight:60.0843
Modify Date.: 2022-11-25 02:23
Introduction: 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. View more+
1. Names and Identifiers
1.1 Name
Silicon dioxide
1.2 Synonyms

LICHROSORB SI 100 (10 MYM) 10 G LICHROSORB SI 100 (10 MYM) 100 G MFCD00148343 SILICA GEL 60 GF254 FOR THIN-LAYER CHROM SILICA GEL 60 PF254 + 366 FOR PREPARATIV SILICA GEL 60 PF254 FOR PREPARATIVE LAYE TLC-SILICA GEL 60 GF254 MEAN PARTICLE SI

1.3 CAS No.
7631-86-9
1.4 CID
24261
1.5 EINECS(EC#)
231-545-4
1.6 Molecular Formula
O2Si (isomer)
1.7 Inchi
InChI=1S/O2Si/c1-3-2
1.8 InChkey
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
1.9 Canonical Smiles
O=[Si]=O
1.10 Isomers Smiles
O=[Si]=O
2. Properties
2.1 Density
2.6
2.1 Melting point
1610℃
2.1 Boiling point
>100?°C(lit.)
2.1 Refractive index
1.46
2.1 Flash Point
n/a
2.1 Precise Quality
59.96680
2.1 PSA
34.14000
2.1 logP
-0.61840
2.1 Appearance
White to yellow suspension
2.2 Storage
Ambient temperatures.
2.3 Chemical Properties
Diatomaceous earth is a transparent to gray,odorless amorphous powder.
2.4 Color/Form
Amorphous powder
Transparent to gray powder (Note: Amorphous silica is the non-crystalline form of O2Si). ... solid
Silica gel is a coherent, rigid, continuous three-dimensional network of spherical particles of colloidal microporous silica.
2.5 Corrosivity
Non-corrosive
2.6 Heat of Combustion
/Non-combustible/
2.7 Odor
Odorless
2.8 PH
5-8 (100g/l, H2O, 20℃)(slurry)
2.9 Water Solubility
H2O: insoluble
2.10 Stability
Stable.
2.11 StorageTemp
2-8°C
3. Use and Manufacturing
3.1 Agricultural Uses
Silica is silicon dioxide, one of the most abundantmaterials on the earth's crust. Quartz is an example ofsilica. It is used as a filler in fertilizers, and also, in themanufacture of glass, ceramics, abrasives, rubber andcosmetics.
3.2 Definition
ChEBI: A silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.
3.3 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.
3.4 Methods of Manufacturing
Mix the aqueous solution of water glass with dilute sulfuric acid, gel at 20~30℃ under a certain pH value, use 2%~2.3% sulfuric acid solution to soak for 3~5h at 25~30℃, use 55~65 Wash at ℃ to acid content (4~6)×10.?Then, remove it with a sieve and dry it to a water content of ≤10%. After screening, dry it to a water content of ≤2%.
3.5 Potential Exposure
Diatomaceous earth is used asa 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 andcontains crystallized silica, and should be handled as silica.See also other entries on silica
3.6 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].
3.7 Shipping
This material is not singled out by DOTin itsPerformance-Oriented Packaging Standards.
3.8 Usage

Manufacture glass, water glass, refractories, abrasives, ceramics, enamels, in scouring-& grinding-compd, ferrosilicon, molds for castings, decolorizing & purifying oils, petroleum products, etc.

3.9 Waste Disposal
Sanitary landfill. Silicon dioxide Preparation Products And Raw materials Raw materials
4. Safety and Handling
4.1 Symbol
GHS07
4.1 Hazard Codes
Xi
4.1 Signal Word
Warning
4.1 Risk Statements
R36/37
4.1 Safety Statements
S26;S37/39
4.1 Exposure Standards and Regulations
The food additive silicon dioxide may be safely used in food in accordance with /specified/ conditions.
Silicon dioxide may be safely used as a component of articles intended for use in packaging, transporting, or holding food in accordance with prescribed conditions.
The food additive silicon dioxide may be safely used in animal feed in accordance with /specified/ conditions.
4.2 Other Preventative Measures
Wetting processes to control dusts must be used wherever feasible. Dust-producing operations should be segregated.
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
4.3 Hazard Declaration
H319-H335
4.3 DisposalMethods
SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.
4.4 RIDADR
无资料?
4.4 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
4.5 Caution Statement
P261-P305 + P351 + P338
4.5 Formulations/Preparations
USEPA/OPP Pesticide Code 072605; 46 Active Products contain amorphous silicon dioxide, celite, diatomaceous earth, or silicon dioxide. Many of these products contain other additional active pesticide ingredients. Trade Names: Chemsico Insecticide DE; Crop Guard; Diafil 610; Diasource Diatomaceous Earth Crawling Insect Killer; Diasource Diatomaceous Earth Grain Storage Insecticide; Diatect D-20; Diatect Insecticide V; Diatect Multipurpose Insecticide; Diatect Multipurpose Insecticide II; Diatect Pet Powder; Diatom Dust Insect Powder; Diatomic Earth; Dry Pyrocide Insecticide; Dryacide; Eaton's Answer II; Eaton's K.I.O. (Kills Insects Only) System; Enforcer Insecticide Powder; Flea Away; Flea Scare; Garden-Ville Diatomaceous Earth; Grapple Flea Powder; Harper Valley Diatomaceous Earth; Hi-Yield Crawling Insect Control; Insecolo; Insect Dust; Insect-Aside P.P.D. Multipurpose Insecticide; Insectaside D. E.; Insectigone; Insecto; Melocide DE-200; Melocide DE-100; Organic Resources Multipurpose Insecticide; Perma Guard Garden and Plant Insecticide D-21; Perma-Guard Commercial Insecticide D-20; Perma-Guard Grain or Seed Storage Insecticide D-10; Perma-Guard Household Insecticide D-20; Perma-Guard Kleen Bin D-20; Perma-Guard Pet and Animal Insecticide D-20; Powdered Insecticide; Protect-It; Pyrocide Insecticide II; Shellshock Insecticide; Southwest Select Diatomaceous Earth; Speer Dry Insecticide; The Graden Guy Diatomaceous Earth; Whitmire PT-239 Tri-Die Insecticide
PERMA-GUARD GRAIN OR SEED STORAGE INSECTICIDE DUST D-10--80% ACTIVE INGREDIENT.
Wettable powder
Wessalon /is/ spray-dried precipitated silica; 98-99.5% silicon dioxide, amorphous; particle sizes 1-100 microns. Other name: Sipernat.
/Cab-O-Sil* is/ 99.8% Silicon dioxide, amorphous. /A/ white powder, ultrafine particle size (.014 microns). Other names: Colloidal Silicon Dioxide, Amorphous Silica. Water dispersible. Combinations: Synergistic effect with other thickeners.
Technical grade, FCC grade, FDA grade, high-purity, 0.03 micron grade, ground and whole grain sand grades, powder, pellets, fumed silica (hydrophobic), aqueous slurries of colloidal fumed silica, ground silica, silica flour, silica gel. A range of grades and mesh sizes.
Diatomaceous earth ... (88% silica) composed of skeletons of small prehistoric aquatic plants related to algae (diatoms).
4.6 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.
4.7 WGK Germany
1
4.7 RTECS
VV7325000
4.7 Protective Equipment and Clothing
FREQUENT QUANT DUST COUNTS & ANALYSES MUST BE MADE ... PARTICLE COUNTS MUST BE KEPT WITHIN SAFE LIMITS. WORKERS EXPOSED ... SHOULD HAVE YEARLY CHEST EXAM. AIRLINE FACE MASKS & PROTECTIVE SUITS MUST BE WORN IN SITUATIONS WHERE DUST CANNOT BE CONTROLLED ... .
Respirator Recommendations: Up to 30 mg/cu m: (Assigned protection factor = 5) Any dust and mist respirator.
Respirator Recommendations: Up to 60 mg/cu m: (Assigned protection factor = 10) Any dust and mist respirator except single-use and quarter-mask respirators/(Assigned protection factor = 10) Any supplied-air respirator
Respirator Recommendations: Up to 150 mg/cu m: (Assigned protection factor = 25) Any supplied-air respirator operated in a continuous-flow mode/(Assigned protection factor = 25) Any powered, air-purifying respirator with a dust and mist filter.
Respirator Recommendations: Up to 300 mg/cu m: (Assigned protection factor = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(Assigned protection factor = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode/(Assigned protection factor = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and a high-efficiency particulate filter/(Assigned protection factor = 50) Any self-contained breathing apparatus with a full facepiece/(Assigned protection factor = 50) Any supplied-air respirator with a full facepiece.
Respirator Recommendations: Up to 3000 mg/cu m: (Assigned protection factor = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode.
Respirator Recommendations: Emergency or planned entry into unknown concentrations or IDLH conditions: (Assigned protection factor = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(Assigned protection factor = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus .
Respirator Recommendations: Escape: (Assigned protection factor = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus.
4.8 Reactivities and Incompatibilities
Fluoride, oxygen difluoride, chlorine trifluoride.
Vinyl acetate vapor may react vigorously in contact with silica gel... . /Silica gel/
4.9 Skin, Eye, and Respiratory Irritations
Irritating to the eye.
4.10 Toxicity
LC inhalation in rat: > 200gm/m3/1H
5. MSDS

2.Hazard identification

2.1 Classification of the substance or mixture

Not classified.

2.2 GHS label elements, including precautionary statements

Pictogram(s) No symbol.
Signal word

No signal word.

Hazard statement(s)

none

Precautionary statement(s)
Prevention

none

Response

none

Storage

none

Disposal

none

2.3 Other hazards which do not result in classification

none

6. Other Information
6.0 Usage
Kieselguhr is used in used as a filtration aid, mild abrasive in products including metal polishes and toothpaste, absorbent for liquids, matting agent for coatings, reinforcing filler in plastics and rubber, anti-block in plastic films, porous support for chemical catalysts, cat litter, activator in blood clotting studies, a stabilizing component of dynamite, and a thermal insulator.
6.1 Usage
Silica gel is used in column chromatography without applied pressure (gravity pulled). It is used as an adsorbent in various applications and in removing impurities. It is used as stationary base in column chromatography.
6.2 Usage
Used as cat litter, food additive, water filtration and humidity indicator. Also a reliable substance to preserve field-collected leafs for molecular studies for variation in DNA.
6.3 Usage
TLC plate preparation
6.4 Usage
Used as sodium stabilizing counterion, for preparation of silica catalytic supports. Also used in glass manufacturing, foundry sand casting, metallurgical flux sand, ceramics sand, gas recovery, paint and coatings, filtration sand, chromatographic column treatment, wood treatment, inks, desiccants and powder metal molding. Its is principle gateway in electronic industries.
6.5 Usage
Silicon(IV) oxide is used in the manufacture of glass for windows, drinking glasses, beverage bottles and many other materials. Optical fibers for telecommunication are made from silica. It is also used as a raw material for many ceramics such as earthenware, stoneware and porcelain. In addition, silica is a common additive in the production of foods and pharmaceutical products.
6.6 Usage
Column chromatography with elevated pressureSilica gel is used in column chromatography without applied pressure (gravity pulled). It is used as an adsorbent in various applications and in removing impurities. It is used as stationary base in column chromatography.
6.7 Usage
Column chromatography with pressure
6.8 Usage
Column chromatographySilica gel is used in column chromatography without applied pressure (gravity pulled). It is used as an adsorbent in various applications and in removing impurities. It is used as stationary base in column chromatography.
6.9 Usage
Silica gel is used in column chromatography without applied pressure (gravity pulled). It is used as an adsorbent in various applications and removing impurities. It is used as stationary base in column chromatography.
6.10 Usage
Column chromatography without applied pressure (gravity pulled)
6.11 Usage
Classic column chromatography with no applied pressure (gravity pulled)Silica gel is used in column chromatography without applied pressure (gravity pulled). It is used as an adsorbent in various applications and in removing impurities. It is used as stationary base in column chromatography.
6.12 Usage
Silica gel 60 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 in dry column chromatography without applied pressure (gravity pulled).
6.13 Usage
Silica gel desiccant is used to dry the air in industrial compressed air systems. It is also used as a preservation tool to control relative humidity in museum and library exhibitions and storage. Further, it is employed in diagnostic test strips, inhalation devices, syringes, drug test kits and hospital sanitation kits. In addition to this, it is used as a stationary phase in chromatography.
6.14 Usage
Silica gel is a useful product for column chromatography.
6.15 Usage
Silica gel, HPLC grade is used in chromatography applications, separation and purification. It is also used in preparative chromatography for HPLC packing, catalyst carriers and resin fillers.
6.16 Usage
A useful product for column chromatography (HPLC). Used as cat litter, food additive, water filtration and humidity indicator. Also a reliable substance to preserve field-collected leafs for molecular studies for variation in DNA.
6.17 Usage
Silica gel is mainly used for the dehydrated purification of the industrial gases, the clearance of the organic acids and high polymers in the insulative oil, the purification and separation of the medicines. It is also used in column chromatography without applied pressure (gravity pulled).
6.18 Usage
Silica gel was used to compare MCM-41 type mesoporous adsorbents. It is exclusively used as a support material for the active titanium(III) centers in Ziegler-Natta catalysts. Silica gel allows a controlled fragmentation resulting in the formation of uniform polymer particles with narrow particle size distribution and high bulk density. It is a useful product for column chromatography.
6.19 Usage
Silica gel is a useful product for column chromatography. It is also used to compare MCM-41 type mesoporous adsorbents. It is exclusively used as a support material for the active titanium(III) centers in Ziegler-Natta catalysts. Silica gel allows a controlled fragmentation resulting in the formation of uniform polymer particles with narrow particle size distribution and high bulk density. It finds it application in drying and cleaning of air and gases, drying of analytical samples, solvents, of synthesis products, optical instruments and devices, protection of Export Consignments from moisture in salty atmosphere, drying and storage of flowers and seeds, desiccant in gas industry, dehydration and purification in oxygen, hydrogen and chlorine, in steel refinery industry and oxygen plant ,it can be used to remove ethane from oxygen.
6.20 Usage
Silica gel is primarily used in plate preparation of thin layer chromatography.
6.21 Usage
High-temperature binders, anti-slip coatings for paper, petrochemical catalyst support and binder, polishing agent, abrasion resistant coatingsSilicon(IV) oxide is used in the manufacture of glass for windows, drinking glasses, beverage bottles and many other materials. Optical fibers for telecommunication are made from silica. It is also used as a raw material for many ceramics such as earthenware, stoneware and porcelain. In addition, silica is a common additive in the production of food and pharmaceutical products.
6.22 Usage
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). SDS mixture of sodium alkyl sulfates consisting chiefly of sodium lauryl sulfate. Used as a suspending and thickening agent in pharmaceutical
6.23 Usage
Silica is used primarily in the production of glass for windows, drinking glasses, beverage bottles, and many other uses. The majority of optical fibers for telecommunication are also made from silica. It is a primary raw material for many ceramics such as earthenware, stoneware, and porcelain. The main ingredient in sand casting for the manufacture of a large number of metallic components in engineering and other applications. Primarily as a flow agent in powdered foods, or to adsorb water in hygroscopic applications. It is the primary component of diatomaceous earth. Colloidal silica is also used as a wine, beer, and juice fining agent.
6.24 Merck
14,8493
6.25 毒性
LC inhalation in rat: > 200gm/m3/1H
6.26 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.
6.27 Uses
6.28 Usage
Silica is used primarily in the production of glass for windows, drinking glasses, beverage bottles. The majority of optical fibers for telecommunication are also made from silica. It is a primary raw material for many ceramics such as earthenware, stoneware, and porcelain. The main ingredient in sand casting for the manufacture of a large number of metallic components in engineering and other applications. Silica is a common additive in the production of foods. An estimated 95% of silicon dioxide produced is consumed in the construction industry.
6.29 Usage
Adhesives, coatings, cosmetics, defomers, inks, lubricants, sealants, thermal insulationSilicon(IV) oxide is used in the manufacture of glass for windows, drinking glasses, beverage bottles and many other materials. Optical fibers for telecommunication are made from silica. It is also used as a raw material for many ceramics such as earthenware, stoneware and porcelain. In addition, silica is a common additive in the production of food and pharmaceutical products.
6.30 Usage
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.
6.31 Usage
Adhesives, coatings, sealants, inks, thermal insulation, silicones to provide hydrophobicity
6.32 Usage
Coatings, thermal insulation, silicones
6.33 Usage
Silicon(IV) oxide is used as sodium aluminate stabilizer. It is also used as SDS mixture of sodium alkyl sulfates consisting chiefly of sodium lauryl sulfate. It is also acts as chain transfer agent in polymerization.
6.34 Usage
Silicon(IV) oxide is used in a variety of applications such as manufacturing of glass, ceramics and abrasives, and water filtration. It is a common additive in dentifrice oral care applications and the production of foods, where it is used primarily as an anti-caking and free-flow agent in powdered foods, or to absorb water in hygroscopic applications.
6.35 Usage
Silica is used in the manufacture of glass for windows, drinking glasses, beverage bottles, and many other materials. Optical fibers for telecommunication are made from silica. It is also used as a raw material for many ceramics such as earthenware, stoneware, and porcelain. In addition, silica is a common additive in the production of foods and pharmaceutical products.
6.36 Storage Conditions
Mix the aqueous solution of water glass with dilute sulfuric acid, gel at 20~30℃ under a certain pH value, use 2%~2.3% sulfuric acid solution to soak for 3~5h at 25~30℃, use 55~65 Wash at ℃ to acid content (4~6)×10.?Then, remove it with a sieve and dry it to a water content of ≤10%. After screening, dry it to a water content of ≤2%.
6.37 Storage features
Separated from strong oxidants.
7. Computational chemical data
  • Molecular Weight: 60.0843g/mol
  • Molecular Formula: O2Si
  • Compound Is Canonicalized: True
  • XLogP3-AA: null
  • Exact Mass: 59.966755773
  • Monoisotopic Mass: 59.966755773
  • Complexity: 18.3
  • Rotatable Bond Count: 0
  • Hydrogen Bond Donor Count: 0
  • Hydrogen Bond Acceptor Count: 2
  • Topological Polar Surface Area: 34.1
  • Heavy Atom Count: 3
  • Defined Atom Stereocenter Count: 0
  • Undefined Atom Stereocenter Count: 0
  • Defined Bond Stereocenter Count: 0
  • Undefined Bond Stereocenter Count: 0
  • Isotope Atom Count: 0
  • Covalently-Bonded Unit Count: 1
  • CACTVS Substructure Key Fingerprint: AAADcQAAMAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
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