Reported in EPA TSCA Inventory.

OSHA PEL: TWA 10 ppm
ACGIH TLV: TWA 10 ppm
DFG MAK: 10 ppm (86 mg/m³)
DOT Classification:  3; Label: Flammable Liquid

The Tetraethyl orthosilicate, with the CAS registry number 78-10-4, is also known as Ethyl silicate. It belongs to the product categories of Si (Classes of Silicon Compounds); Si-O Compounds; Tetraalkoxysilanes; Crosslinkers; Crosslinking Agents; Orthosilicate; Organosilicon compounds; CVD and ALD Precursors Packaged for Deposition Systems; Materials Science; Micro &; Micro/NanoElectronics; Nanoelectronics; New Products for Materials Research and Engineering; Vapor Deposition Precursors. Its EINECS number is 201-083-8. This chemical's molecular formula is C₈H₂₀O₄Si and molecular weight is 208.33. What's more, its systematic name is 1,2-Ethanediylbis[dichloro(methyl)silane]. Its classification code is Skin / Eye Irritant. This chemical should be sealed and stored in a cool and dry place. Moreover, it should be protected from oxides, acids, heat and fire. It is mainly used as a crosslinking agent in silicone polymers and as a precursor to silicon dioxide in the semiconductor industry. Other applications include coatings for carpets and other objects. This substance is used in the production of aerogel. 

Physical properties of Tetraethyl orthosilicate are: (1)ACD/LogP: 3.811; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.81; (4)ACD/LogD (pH 7.4): 3.81; (5)ACD/BCF (pH 5.5): 464.12; (6)ACD/BCF (pH 7.4): 464.12; (7)ACD/KOC (pH 5.5): 2820.85; (8)ACD/KOC (pH 7.4): 2820.85; (9)#H bond acceptors: 4; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 8; (12)Polar Surface Area: 36.92 Å²; (13)Index of Refraction: 1.409; (14)Molar Refractivity: 54.81 cm³; (15)Molar Volume: 221.776 cm³; (16)Polarizability: 21.728×10^-24cm³; (17)Surface Tension: 23.5 dyne/cm; (18)Density: 0.939 g/cm³; (19)Flash Point: 46.667 °C; (20)Enthalpy of Vaporization: 38.547 kJ/mol; (21)Boiling Point: 165.499 °C at 760 mmHg; (22)Vapour Pressure: 2.5 mmHg at 25°C.

Preparation: this chemical can be prepared by allylamine and triethoxysilane. This reaction will need reagents H₂PtCl₆·6H₂O, 7,8-dicarba-nido-undecaborate(1-) with the reaction time of 10 hours. The yield is about 69.9%.

Uses of Tetraethyl orthosilicate: it can be used to produce ethoxy-tributyl-silane at the ambient temperature. It will need solvents diethyl ether, hexane with the reaction time of 1 hour. The yield is about 66%.

When you are using this chemical, please be cautious about it as the following:
This chemical is flammable, so you should keep it away from sources of ignition - No smoking. It is harmful by inhalation and is irritating to eyes and respiratory system. When using it, you need wear suitable protective clothing, gloves and eye/face protection.

You can still convert the following datas into molecular structure:
(1)SMILES: CCO[Si](OCC)(OCC)OCC
(2)Std. InChI: InChI=1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3
(3)Std. InChIKey: BOTDANWDWHJENH-UHFFFAOYSA-N

The toxicity data is as follows: