甲基三(三甲基硅氧基)硅烷

Description

Methyltris(trimethylsiloxy)silane · CAS 17928-28-8 · C10H30O3Si4. UNII S73ZQI0GXM. Boiling Point: 381 °F at 760 mmHg (NTP, 1992); Melting Point: -105 °F (NTP, 1992); Flash Point: 187 °F (NTP, 1992).

Identification

CAS Registry Number	17928-28-8
PubChem CID	28838
Molecular formula	C10H30O3Si4
IUPAC name	trimethyl-[methyl-bis(trimethylsilyloxy)silyl]oxysilane
UNII (FDA)	S73ZQI0GXM

Computed Descriptors

Molecular Weight	310.68
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	6
Exact Mass	310.12720095
Monoisotopic Mass	310.12720095
Topological Polar Surface Area	27.7
Heavy Atom Count	17
Formal Charge	0
Complexity	209

Physical & Chemical Properties

Boiling Point	381 °F at 760 mmHg (NTP, 1992)
Melting Point	-105 °F (NTP, 1992)
Flash Point	187 °F (NTP, 1992)

Physical description & handling notes

• Methyltris(trimethylsiloxy)silane is a clear colorless liquid. (NTP, 1992)
• Liquid
• less than 1 mg/mL at 68 °F (NTP, 1992)
• 0.8536 at 68 °F (NTP, 1992) - Less dense than water; will float

Regulatory Status

GHS notification summary	21.4% (41 / 192)

GHS Hazard Classification

GHS notification summary	21.4% (41 / 192)
Reported hazard statements	H226 (78.1%), H315 (22.4%), H319 (22.4%), H335 (21.9%), H373 (55.7%)

Documented Uses

• Cosmetics product ingredient: 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane (Methyl trimethicone)
• Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]-: ACTIVE

Synonyms

METHYLTRIS(TRIMETHYLSILOXY)SILANE; Methyl trimethicone; 1,1,1,3,5,5,5-Heptamethyl-3-((trimethylsilyl)oxy)trisiloxane; methyl tris(trimethylsiloxy)silane; Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]-; 1,1,1,3,5,5,5-Heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane; UNII-S73ZQI0GXM; S73ZQI0GXM; EINECS 241-867-7; Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-((trimethylsilyl)oxy)-; tris(trimethylsiloxy)methylsilane; DTXSID9025669; TMF-1.5; EC 241-867-7; Methyl tris-(trimethylsilyloxy)silane; RefChem:158355

Frequently Asked Questions

What are the CAS number and molecular formula of Methyltris(trimethylsiloxy)silane?

CAS 17928-28-8; molecular formula C10H30O3Si4; molecular weight — g/mol.

What other names is Methyltris(trimethylsiloxy)silane known by?

METHYLTRIS(TRIMETHYLSILOXY)SILANE, Methyl trimethicone, 1,1,1,3,5,5,5-Heptamethyl-3-((trimethylsilyl)oxy)trisiloxane, methyl tris(trimethylsiloxy)silane, Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]-, 1,1,1,3,5,5,5-Heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane.

Is Methyltris(trimethylsiloxy)silane classified as hazardous?

21.4% of GHS notifications report no hazard classification (41 of 192).

What are the key physical properties of Methyltris(trimethylsiloxy)silane?

Boiling Point: 381 °F at 760 mmHg (NTP, 1992); Melting Point: -105 °F (NTP, 1992); Flash Point: 187 °F (NTP, 1992).

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.