Trimethoxysilane

Description

Trimethoxysilane · CAS 2487-90-3 · C3H10O3Si. UNII V1J39XPF91. Boiling Point: 84 °C; Melting Point: -115 °C; Density: 0.860 g/cu cm at 20 °C.

Identification

CAS Registry Number	2487-90-3
PubChem CID	17215
Molecular formula	C3H10O3Si
IUPAC name	trimethoxysilane
UNII (FDA)	V1J39XPF91

Computed Descriptors

Molecular Weight	122.19
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	3
Exact Mass	122.03992071
Monoisotopic Mass	122.03992071
Topological Polar Surface Area	27.7
Heavy Atom Count	7
Formal Charge	0
Complexity	31.7

Physical & Chemical Properties

Boiling Point	84 °C
Melting Point	-115 °C
Density	0.860 g/cu cm at 20 °C
Density	0.860 @ 20°C
Vapor Pressure	76.0 [mmHg]
Vapor Pressure	76 mm Hg at 25 °C (ext)
Vapor Pressure	76 [mm Hg] @25 °C
Heat of Combustion	-2.46X10-9 J/kmol

Physical description & handling notes

• Trimethoxysilane appears as a colorless liquid. Slightly soluble in water and denser than water. Hence floats on water. Very toxic by ingestion, inhalation or skin absorption. May also be corrosive to skin and eyes.
• Liquid
• A colorless liquid; [CAMEO]
• Hydrolyzes rapidly in water
• When heated to decomp, it emits acrid smoke and irritating fumes.
• The silanes decomp at elevated temp to liberate hydrogen and deposit a high purity silicon, which leads to some of the principal uses of silanes. /Silanes/

GHS Hazard Classification

Reported hazard statements	H225 (100%), H261 (65.8%), H302 (31.7%), H314 (66.7%), H318 (14.2%), H319 (63.3%), H330 (99.2%), H335 (35%)

Documented Uses

• Used to make organic coupling agents (adhesion promoters) in the plastics industry; [HSDB]
• Used to prepare a number of organic coupling agents utilized by the plastics industry as adhesion promotors.
• Used in the industrial production of trimethoxysilylpropyl methacrylate [2530-85-0] by direct addition of trimethoxy silane in the presence of radical scavengers.
• Used as an adhesive and bindings agent (92%), as an intermediate (7%) and as a surface active agent (1%).
• Reaction of silicon with ethanol or methanol containing less than 2000 ppm water produces trimethoxy silane with cuprous chloride as the catalyst.
• Silane reacts with methanol at room temperature to produce ... trimethoxysilane.

Synonyms

RefChem:899733; DTXCID707482; 219-637-2; 2487-90-3; DTXSID0027482; LS 330; Silane, trimethoxy-; Trimethoxy silane; Trimethoxysilane; V1J39XPF91; trimethoxy-silane; Trimethoxysilane (>85%); LMD 930; LS 330; SY 2012;; (MeO)3SiH; SCHEMBL37612; NS00046824

Frequently Asked Questions

What are the CAS number and molecular formula of Trimethoxysilane?

CAS 2487-90-3; molecular formula C3H10O3Si; molecular weight — g/mol.

What other names is Trimethoxysilane known by?

RefChem:899733, DTXCID707482, 219-637-2, 2487-90-3, DTXSID0027482, LS 330.

Is Trimethoxysilane classified as hazardous?

Hazard statements reported: H225, H261, H302, H314, H318.

What are the key physical properties of Trimethoxysilane?

Boiling Point: 84 °C; Melting Point: -115 °C; Density: 0.860 g/cu cm at 20 °C; Density: 0.860 @ 20°C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.