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| CAS No.: | 7631-86-9 |
|---|---|
| Name: | Silicon dioxide |
| Molecular Structure: | |
|
|
|
| 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: |
 Xn,  Xi
|
| Risk Codes: | 36/37/38-36/37-22 |
| Safety: | 26-37/39-36-36/37/39 |
| PSA: | 34.14000 |
| LogP: | -0.61840 |
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| Conditions | Yield |
|---|---|
| In methanol | 86% |
| In methanol | 86% |
| In methanol | 86% |
| Conditions | Yield |
|---|---|
| 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; |
| Conditions | Yield |
|---|---|
| With water at 750℃; for 4h; |
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- 7631-86-9
SiO2
| Conditions | Yield |
|---|---|
| With pyridine; sulfuric acid; ammonia In methanol; dichloromethane |
| Conditions | Yield |
|---|---|
| In 5,5-dimethyl-1,3-cyclohexadiene |
| Conditions | Yield |
|---|---|
| With hydrogenchloride; boric acid In methanol; ethanol; diethylene glycol dimethyl ether; water; acetone | 11.1 g (40.0 mmol, 74%) |
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Standards and Recommendations
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, |