1,1,1,3,5,5,5-Heptamethyltrisiloxane

Q: What are the molecular formula and molecular weight of 1,1,1,3,5,5,5-Heptamethyltrisiloxane?

C7H22O2Si3, molecular weight 222.505 g/mol

双三甲基硅氧基甲基硅烷

Also known as: Bis(trimethylsiloxy)methylsilane, Heptamethyltrisiloxane, 3H-Heptamethyltrisiloxane, Methylbis(trimethylsilyloxy)silane, HSi(OSiMe3)2Me, HSi(OTMS)2Me, MFCD00048000, Dow Corning 1107 Water Repellent and Powder Treatment, Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-, 40M25

CAS No.: 1873-88-7
Jingsj CID: J-1359647-5
Molecular Formula: C₇H₂₂O₂Si₃
Chinese Name: 双三甲基硅氧基甲基硅烷
Molecular Weight: 222.505 g/mol
Category: Aliphatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	<0ºC
Boiling Point	163.8±23.0 °C at 760 mmHg
Density	0.819 g/mL at 25 °C(lit.)
Flash Point	52.8±22.6 °C

GHS Safety & Compliance

Flammable / IrritantSignal word: Danger

Frequently Asked Questions

What is the CAS number of 1,1,1,3,5,5,5-Heptamethyltrisiloxane?

1873-88-7

What are the molecular formula and molecular weight of 1,1,1,3,5,5,5-Heptamethyltrisiloxane?

C7H22O2Si3, molecular weight 222.505 g/mol

Is 1,1,1,3,5,5,5-Heptamethyltrisiloxane hazardous?

Danger

Data compiled from public chemical databases and supplier catalogs; verify specifications with suppliers before purchase. · Last updated: 8/21/2026