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
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)
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
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.
N-Bromosuccinimide Price
- 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
- Product number
- 926892
- Product name
- MCM-41 100nm nanoparticle
- Purity
- pore size 30??, thiol functionalized
- Packaging
- 15MG
- Price
- $350
- Updated
- 2024/03/01
- Product number
- 926884
- Product name
- MCM-41 100nm nanoparticle
- Purity
- pore size 30??, amine functionalized
- Packaging
- 15MG
- Price
- $350
- Updated
- 2024/03/01
- Product number
- 916153
- Product name
- Lithiummodifiedsilicananoparticles
- Purity
- poresizenon-porous,400?nmparticlesize
- Packaging
- 1G
- Price
- $247
- Updated
- 2024/03/01
- Product number
- 915904
- Product name
- Lithiummodifiedsilicananoparticles
- Purity
- poresizenon-porous,600?nmparticlesize
- Packaging
- 1G
- Price
- $247
- Updated
- 2024/03/01
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
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
Preparation Products
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View Lastest Price from Silicon dioxide manufacturers
- 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
- 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
- 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