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) .

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

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,