Methyltrimethoxysilane

Description

Methyltrimethoxysilane · CAS 1185-55-3 · C4H12O3Si. UNII 0HI0D71MCI. Boiling Point: 103.5 °C @760 [mm Hg]; Density: 0.949 @ 20°C.

Identification

CAS Registry Number	1185-55-3
PubChem CID	14456
Molecular formula	C4H12O3Si
IUPAC name	trimethoxy(methyl)silane
UNII (FDA)	0HI0D71MCI

Computed Descriptors

Molecular Weight	136.22
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	3
Exact Mass	136.05557077
Monoisotopic Mass	136.05557077
Topological Polar Surface Area	27.7
Heavy Atom Count	8
Formal Charge	0
Complexity	54

Physical & Chemical Properties

Boiling Point	103.5 °C @760 [mm Hg]
Density	0.949 @ 20°C

Physical description & handling notes

• Liquid; Liquid; Other Solid; CBI
• Colorless liquid; [Sigma-Aldrich MSDS]

Regulatory Status

GHS notification summary	1.7% (22 / 1271)

GHS Hazard Classification

GHS notification summary	1.7% (22 / 1271)
Reported hazard statements	H225 (97.6%), H315 (57.2%), H317 (14.8%), H319 (53.7%), H335 (43.4%), H318 (66.7%), H320, H332

Documented Uses

• Used in household products for conditioning and waterproofing leather; [REPROTOX]
• The uses of Methyltrimethoxysilane (MTMS) include as a coupling agent in thermoplastics and thermosetting resins, a cross-linker in silicone sealants, a water repellent component, and in silicone hard-coats for plastics.
• Not Known or Reasonably Ascertainable
• Information on 24 consumer products that contain Methyltrimethoxysilane in the following categories is provided:
• 2023: 5,000,000 - <10,000,000 lb
• 2022: 5,000,000 - <10,000,000 lb

Synonyms

Methyltrimethoxysilane; 1185-55-3; Trimethoxy(methyl)silane; Trimethoxymethylsilane; Silane, trimethoxymethyl-; DTXSID3027370; Z 6070; 0HI0D71MCI; GLASCA B; NSC-93883; SILQUEST A 1630; DTXCID407370; DOW CORNING 7-5300 FILM-IN-PLACE COATING; DOW CORNING (R) 7-5310 FILM-IN-PLACE BASE; RefChem:818737; 214-685-0

Frequently Asked Questions

What are the CAS number and molecular formula of Methyltrimethoxysilane?

CAS 1185-55-3; molecular formula C4H12O3Si; molecular weight — g/mol.

What other names is Methyltrimethoxysilane known by?

Methyltrimethoxysilane, 1185-55-3, Trimethoxy(methyl)silane, Trimethoxymethylsilane, Silane, trimethoxymethyl-, DTXSID3027370.

Is Methyltrimethoxysilane classified as hazardous?

1.7% of GHS notifications report no hazard classification (22 of 1271).

What are the key physical properties of Methyltrimethoxysilane?

Boiling Point: 103.5 °C @760 [mm Hg]; Density: 0.949 @ 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.