| Identification | More | [Name]
Silicon dioxide | [CAS]
14808-60-7 | [Synonyms]
ALUMINUM CALCIUM SODIUM SILICATE
ALUMINUM SODIUM SILICATE
CRYSTALLINE SODIUM POTASSIUM ALUMINOSILICATE
HYDRANAL(R)-MOLECULAR SIEVE
MOLECULAR SEIVES, TYPE 4 A
MOLECULAR SIEVE
MOLECULAR SIEVE 13X
MOLECULAR SIEVE 3A
MOLECULAR SIEVE 4A
MOLECULAR SIEVE 5A
MOLECULAR SIEVES
MOLECULAR SIEVES 13X
MOLECULAR SIEVES 3A
MOLECULAR SIEVES 4A
MOLECULAR SIEVES 5A
MOLECULAR SIEVES, AW-300
MOLECULAR SIEVES, GRADE 514
MOLECULAR SIEVES, GRADE 564
MOLECULAR SIEVES,(LINDE 13X)
MOLECULAR SIEVES,(LINDE 3A) | [EINECS(EC#)]
215-684-8 | [Molecular Formula]
O2Si | [MDL Number]
MFCD00131613 | [Molecular Weight]
60.0843 | [MOL File]
14808-60-7.mol |
| Chemical Properties | Back Directory | [Definition]
Crystallized silicon dioxide (silica).
| [Appearance]
Silicon dioxide/crystalline silica is a component of many mineral dusts and materials which melts to a glass at very high temperature. | [Melting point ]
1610 °C(lit.)
| [Boiling point ]
2230 °C | [bulk density]
1400kg/m3 | [density ]
2.6 g/mL at 25 °C(lit.)
| [refractive index ]
n20/D 1.544(lit.)
| [storage temp. ]
no restrictions. | [solubility ]
insoluble in H2O, acid solutions; soluble in HF | [form ]
powder
| [color ]
white | [Specific Gravity]
2.2-2.6 | [PH]
5-8 (400g/l, H2O, 20℃)(slurry) | [Stability:]
Stable. | [Water Solubility ]
insoluble | [Crystal Structure]
Quartz type | [crystal system]
Three sides | [Space group]
P3221 | [Lattice constant]
| a/nm | b/nm | c/nm | α/o | β/o | γ/o | V/nm3 | | 0.49134 | 0.49134 | 0.54052 | 90 | 90 | 120 | 0.113 |
| [Dielectric constant]
4.2（0.0℃） | [Exposure limits]
ACGIH: TWA 0.025 mg/m3
OSHA: TWA 50 μg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.05 mg/m3 | [InChIKey]
VYPSYNLAJGMNEJ-UHFFFAOYSA-N | [Uses]
Silicon Dioxide is an anticaking agent, carrier, and dispersant that
can absorb approximately 120% of its weight and remain free flowing.
it is used in salt, flours, and powdered soups to prevent caking caused
by moisture. it is also used in powdered coffee whitener, vanilla
powder, baking powder, dried egg yolk, and tortilla chips. the usage
level ranges from 1 to 2%. it is also termed silica, amorphous. | [CAS DataBase Reference]
14808-60-7(CAS DataBase Reference) | [IARC]
1 (Vol. Sup 7, 68, 100C) 2012 | [NIST Chemistry Reference]
Silicon oxide(14808-60-7) | [EPA Substance Registry System]
14808-60-7(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
Xn | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin .
R48/20:Harmful: danger of serious damage to health by prolonged exposure through inhalation . | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S24/25:Avoid contact with skin and eyes .
S22:Do not breathe dust . | [OEB]
D | [OEL]
TWA: 0.05 mg/m3 | [WGK Germany ]
3
| [RTECS ]
ZG6800000
| [TSCA ]
Yes | [HS Code ]
25061000 | [Safety Profile]
Confirmed carcinogen with experimental carcinogenic, tumorigenic, and neoplastigenic data. Experimental poison by intratracheal and intravenous routes. An inhalation hazard. Human systemic effects by inhalation: cough, dyspnea, liver effects. Incompatible with OF2, vinyl acetate. See also other silica entries | [Hazardous Substances Data]
14808-60-7(Hazardous Substances Data) | [Toxicity]
LDLo intravenous in dog: 20mg/kg | [IDLA]
25 mg/m3 |
| Hazard Information | Back Directory | [Hazard]
Avoid inhalation of fine particles.
| [Potential Exposure]
Cristobalite is used in the manufacture of water glass, refractories, abrasives, ceramics and enamels. Quartz is used as a mineral, natural or synthetic fiber. Tridymite is used as a filtering and insulating media and as a refractory material for furnace linings. Workers are potentially exposed to crystalline silica in such industries as granite quarrying and cutting, foundry operations; metal, coal, dentistry, painting, and nonmetallic mining; and manufacture of clay and glass products. | [First aid]
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. | [Incompatibilities]
Violent reactions with powerful oxidizers: fluorine, chlorine trifluoride; manganese trioxide; oxygen difluoride, hydrogen peroxide, etc.; acetylene; ammonia. | [Chemical Properties]
granular abrasive solid of varied colour, depending upon other | [Chemical Properties]
Silicon dioxide/crystalline silica is a component of many mineral dusts and materials which melts to a glass at very high temperature. | [Waste Disposal]
Sanitary landfill | [Occurrence]
QUARTZ is the mineral quartz, oxide of the nonmetallic element silicon, is the commonest of minerals, and appears in a greater number of forms than any other. Its formula is SiO2. Quartz commonly occurs in prismatic hexagonal crystals terminated by a pyramid. This pyramid is due to the equal development of two rhombohedrons, and may be observed in cases where one rhombohedron predominates. Cleavage is not observed; the fracture is typically conchoidal; hardness is 7; specific gravity, 2.65; luster, vitreous to greasy or dull; colorless to white, pink, purple, yellow, blue, green, smoky brown to nearly black; transparent to opaque. | [Characteristics]
Silica can exist in either a crystalline or noncrystalline form. In quartz, SiO2 exists in the natural crystalline state and possesses long-range order, with the silicon atom covalently bonded to oxygen atoms in a tetrahedral arrangement in a regular repeating pattern. Glass is an example of noncrystalline silica. Although natural glasses exist, silica glasses are produced when silica is heated to an elevated temperature and then rapidly cooled. The rapid cooling does not allow the SiO2 to form a regular crystalline structure with long-range order. The result is a solid that behaves like a viscous liquid when heated. Glass is sometimes called a solid solution and fl ows at a very slow rate. This can sometimes be seen in old window glass where the bottom is slightly thicker than the top. The actual structures form a three-dimensional tetrahedral pattern. Silica is sold as sand and its main uses are for glass; ceramics; foundry sand, a source of silicon in the chemical industry; as a filtration media; a filler/extender; an abrasive; and as an adsorbent. | [Reactions]
SiO2 shows strong absorption at 8.5 mm, 9.2 mm, and 12.5 mm (refer to the Silica) and SiO at 10.4 m. Thin films of SiO2 are fabricated by oxidizing the SiO in air after deposition of SiO by vacuum evaporation. | [General Description]
This Standard Reference Material (SRM) is intended for use in evaluating methods used to determine trace constituents in starting materials for the manufacture of glasses and similar products. This SRM is offered in 75 g units. For more information, please refer to the SDS and COA.
SRM 165A_cert SRM 165A _SDS | [Health Hazard]
Exposure to silica can result in the disease called silicosis. Silicosis is a disabling, nonreversible,
and sometimes fatal lung disease caused by overexposure to respirable crystalline
silica. In silicosis, silica particles enter the lung where they become trapped, producing areas
of swelling. The swelling results in nodules that become progressively larger as the condition
worsens. Silicosis is defi ned at several levels of severity: chronic silicosis, accelerated silicosis,
and acute silicosis. Chronic silicosis results from long-term (20 years) exposure to low
concentrations of silica, whereas acute silicosis is the result of a short-term exposure (a year
or less) to high concentrations. Symptoms may not be obvious in cases of chronic silicosis
and x-ray screening is recommended for at-risk groups. Th ese include sand-blasters, miners,
laborers who regularly saw, drill, and jack-hammer concrete, and general construction such as
tunnel drilling. In advanced stages of silicosis, individuals have difficulty breathing, especially
when active. | [Industrial uses]
Crushed and graded quartz is used as the abrasive in flint sandpapers. Almost any deposit of massive white quartz is suitable. Being the cheapest of all the abrasive-coated paper, this product is still sold in fair amounts, mainly in hardware stores and by small jobbers. It is made only in the form of paper, not as cloth. True chalk flint from England and France is used extensively for this purpose in Europe; it has better cutting qualities and longer life than ordinary quartz. Crushed and ground sand, sandstone, powdered quartz, and silt are sometimes used in hand soaps, scouring compounds, and harsher metal polishes. | [Carcinogenicity]
Silica was not mutagenic in bacterial
assays; both positive and negative results have
been reported in a wide variety of in vivo and
in vitro genotoxic assays. | [Toxics Screening Level]
The Initial Threshold Screening Level for crystalline silica is 3 μg/m3, with an annual
averaging time. |
| Questions And Answer | Back Directory | [Description]
Silicon dioxide (chemical formula: SiO2) is a chemical compound comprised of oxide and silicon elements. It is insoluble in water or acids except hydrofluoric acid. It appears as transparent to gray, tasteless crystal which is widely presented in nature as sand or quartz. It is also one of the most abundant mineral existing in Earth’s crust. It has wide applications in various fields as below: (1) as the precursor to glass and silicon; (2) for sand casting; (3) as a additive to food and pharmaceutical products; (4) for production of cement and refractory materials; (5) as the medium for conversion of energy. (6) Extraction of DNA and RNA; (7) as a defoamer component. There are many ways for production of silicon. The most common way is through mining and purification of quartz.
| [References]
https://en.wikipedia.org/wiki/Silicon_dioxide
http://www.newhealthguide.org/Silicon-Dioxide.html
|
|
|