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7631-86-9

Basic Information
CAS No.: 7631-86-9
Name: Silicon dioxide
Article Data: 1314
Cas Database
Molecular Structure:
Molecular Structure of 7631-86-9 (Silicon dioxide)
Formula: SiO2
Molecular Weight: 60.0843
Synonyms: Silicon dioxide, chemically prepared;Silica (SiO2);Amorphous silica;Silica slurry;Silica, amorphous, fumed;Silicon dioxide (amorphous);
EINECS: 231-545-4
Density: 2.2-2.6 g/mL at 25 °C
Melting Point: >1600 °C(lit.)
Boiling Point: >100oC(lit.)
Flash Point: 2230 °C
Solubility: insoluble in water
Appearance: white crystals or powder
Hazard Symbols: HarmfulXn, IrritantXi
Risk Codes: 36/37/38-36/37-22
Safety: 26-37/39-36-36/37/39
Transport Information: N/A
PSA: 34.14000
LogP: -0.61840
Synthetic route
59803-98-4

5-bromo-6-(imidazolin-2-ylamino)-quinoxaline

134892-42-5

SKF 190851

Conditions
ConditionsYield
In methanol86%
In methanol86%
In methanol86%

palladium (II) nitrate

7803-68-1

orthotelluric acid

Reaxys ID: 11464643

Reaxys ID: 11464643

Conditions
ConditionsYield
Stage #1: palladium (II) nitrate; orthotelluric acid; SiO2 In water
Stage #2: at 50 - 400℃; for 8h;
Stage #3: With hydrogen at 400℃; for 5h;
ZSM-5

ZSM-5

H-type ZSM-5(1)

H-type ZSM-5(1)

Conditions
ConditionsYield
With water at 750℃; for 4h;
7784-27-2

aluminium trinitrate

111-18-2

N,N,N',N'-tetramethylhexamethylenediamine

7664-39-3

hydrogen fluoride

11113-50-1

boric acid

N,N,N,N',N',N'-hexamethyl-1,6-hexanediammonium dihydroxide

silicate ITQ-13, boron form

silicate ITQ-13, boron form

coated solid pesticide B

coated solid pesticide B

coated solid pesticide A

coated solid pesticide A

coated solid pesticide C

coated solid pesticide C

composition D

composition D

59-14-3

5-bromo-2'-deoxyuridine

5536-30-1

5-amino-2'-deoxyuridine

Conditions
ConditionsYield
With pyridine; sulfuric acid; ammonia In methanol; dichloromethane
108-31-6

maleic anhydride

p-phosphoric acid

p-phosphoric acid

108-91-8

cyclohexylamine

1631-25-0

N-cyclohexylmaleimide

Conditions
ConditionsYield
In 5,5-dimethyl-1,3-cyclohexadiene
110-89-4

piperidine

699-83-2

2,6-dihydroxylacetophenone

939-97-9

4-tert-Butylbenzaldehyde

4'-tert-butyl-5-hydroxyflavanone

Conditions
ConditionsYield
With hydrogenchloride; boric acid In methanol; ethanol; diethylene glycol dimethyl ether; water; acetone11.1 g (40.0 mmol, 74%)
144875-48-9

resquimod

102-76-1

triacetylglycerol

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Consensus Reports

IARC Cancer Review: Animal Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 42 ,1988,p. 209.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 42 ,1988,p. 209.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) .

Standards and Recommendations

OSHA PEL: TWA 6 mg/m3
ACGIH TLV: TWA (nuisance particulate) 10 mg/m3 of total dust (when toxic impurities are not present, e.g., quartz <1%)
DFG MAK: 4 mg/m3 as total dust

Specification

The Silicon dioxide is an organic compound with the formula SiO2. The IUPAC name of this chemical is dioxosilane. With the CAS registry number 7631-86-9, it is also named Colloidal silicon dioxide. The product's categories are Siloxanes; Inorganics; Silica Gels. Besides, it is a white crystals or powder, which should be stored in a closed cool and dry place.

Physical properties about Silicon dioxide are: (1)#H bond acceptors: 2; (2) Polar Surface Area: 34.14 Å2.

Preparation of Silicon dioxide: this chemical can be prepared through low temperature oxidation (400–450 °C) of silane.
SiH4 + 2 O2 → SiO2 + 2 H2O

Uses of Silicon dioxide: it is used primarily in the production of glass for windows, drinking glasses, beverage bottles, and many other uses. The majority of optical fibers for telecommunications are also made from silica. It is a primary raw material for many whiteware ceramics such as earthenware, stoneware, porcelain, as well as industrial Portland cement. Silica is a common additive in the production of foods, where it is used primarily as a flow agent in powdered foods, or to absorb water in hygroscopic applications. It is the primary component of diatomaceous earth which has many uses ranging from filtration to insect control. It is also the primary component of rice husk ash which is used, for example, in filtration and cement manufacturing. In its capacity as a refractory, it is useful in fiber form as a high-temperature thermal protection fabric. In cosmetics, it is useful for its light-diffusing properties and natural absorbency. Colloidal silica is used as a wine and juice fining agent. In pharmaceutical products, silica aids powder flow when tablets are formed. Finally, it is used as a thermal enhancement compound in ground source heat pump industry.

When you are using this chemical, please be cautious about it as the following:
It is harmful if swallowed. Besides, this chemical is irritating to eyes, respiratory system and skin. When you are using it, wear suitable gloves and eye/face protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: O=[Si]=O
(2)InChI: InChI=1/O2Si/c1-3-2
(3)InChIKey: VYPSYNLAJGMNEJ-UHFFFAOYAU
(4)Std. InChI: InChI=1S/O2Si/c1-3-2
(5)Std. InChIKey: VYPSYNLAJGMNEJ-UHFFFAOYSA-N

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rat LC inhalation > 200gm/m3/1H (200000mg/m3) LUNGS, THORAX, OR RESPIRATION: "FIBROSIS, FOCAL (PNEUMOCONIOSIS)" National Technical Information Service. Vol. OTS0537735,
rat LCLo inhalation 2190mg/m3/4H (2190mg/m3) LUNGS, THORAX, OR RESPIRATION: DYSPNEA National Technical Information Service. Vol. OTS0537804,
rat LDLo oral 5gm/kg (5000mg/kg)   National Technical Information Service. Vol. OTS0537804,