Silicon dioxide

$ 1.00 /1kg

Min. Order1kg
Purity99%
Cas No 7631-86-9
Supply Ability100KG
Update time2019-07-06

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Chemical Properties

Product Name	Silicon dioxide
CAS No	7631-86-9
EC-No
Min. Order	1kg
Purity	99%
Supply Ability	100KG
Release date	2019/07/06

AD68

Silicon dioxide Basic information

General Description Uses

Product Name:	Silicon dioxide
Synonyms:	SILICA GEL 60 PF254 FOR PREPARATIVE LAYE;LICHROSORB SI 100 (10 MYM) 10 G;TLC-SILICA GEL 60 GF254 MEAN PARTICLE SI;LICHROSORB SI 100 (10 MYM) 100 G;SEA SAND EXTRA PURE 5 KG;SILICA GEL 60 GF254 FOR THIN-LAYER CHROM;SILICA GEL 60 PF254 + 366 FOR PREPARATIV;SEA SAND EXTRA PURE 25 KG
CAS:	7631-86-9
MF:	O2Si
MW:	60.08
EINECS:	231-545-4
Product Categories:	#N/A;Siloxanes;Inorganics;Silica Gels;organofunctional catalyst support;metals scavenging agent;molecular sieves;metal oxide;Mesoporous Materials;Ceramic Science;Materials Science;Metal &;Nanomaterials;New Products for Materials Research and Engineering
Mol File:	7631-86-9.mol

Silicon dioxide Chemical Properties

Melting point	>1600 °C(lit.)
Boiling point	>100 °C(lit.)
density	2.2-2.6 g/mL at 25 °C
refractive index	1.46
Fp	2230°C
storage temp.	Refrigerator (+4°C)
solubility	Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
form	suspension
color	White to yellow
PH	5-8 (100g/l, H2O, 20℃)(slurry)
Water Solubility	insoluble
Sensitive	Hygroscopic
Merck	14,8493
Stability:	Stable.
CAS DataBase Reference	7631-86-9(CAS DataBase Reference)
NIST Chemistry Reference	Silicon(iv) oxide(7631-86-9)
EPA Substance Registry System	Silica(7631-86-9)

Safety Information

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
WGK Germany	1
RTECS	VV7310000
TSCA	Yes
HS Code	28112200

MSDS Information

Provider	Language
Silica	English

Silicon dioxide Usage And Synthesis

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
Construction	Sand casting	Main ingredient/high melting point
Glass	High purity silica glass	Raw material/high temperature and corrosion resistance
Glass	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
Pharmaceutical	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

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

Definition

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

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.

Hazard

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

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

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].