1,1,1,3,5,5,5-Heptamethyltrisiloxane
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
1,1,1,3,5,5,5-Heptamethyltrisiloxane (CAS 1873-88-7) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C7H21O2Si3 and a molecular weight of 222.505 g/mol. Key properties include a melting point of <0ºC, a boiling point of 163.8±23.0 °C at 760 mmHg, a density of 0.819 g/mL at 25 °C(lit.) and a flash point of 52.8±22.6 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.
- CAS No.
- 1873-88-7
- Jingsj CID
- J-1359647-9
- Molecular Formula
- C7H21O2Si3
- Molecular Weight
- 222.505 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 11/3/2026
No offers for this compound yet.
Request a quotePhysicochemical 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 |
| Exact Mass | 222.092758 |
| PSA | 18.46000 |
| LogP | 5.32 |
| Vapor Pressure | 2.7±0.3 mmHg at 25°C |
| Refractive Index | n20/D 1.382(lit.) |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2934999090 |
|---|---|
| Summary | 2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 1,1,1,3,5,5,5-Heptamethyltrisiloxane?
The CAS number of 1,1,1,3,5,5,5-Heptamethyltrisiloxane is 1873-88-7.
What are the molecular formula and molecular weight of 1,1,1,3,5,5,5-Heptamethyltrisiloxane?
1,1,1,3,5,5,5-Heptamethyltrisiloxane has molecular formula C7H21O2Si3 and molecular weight 222.505 g/mol.
Is 1,1,1,3,5,5,5-Heptamethyltrisiloxane hazardous?
1,1,1,3,5,5,5-Heptamethyltrisiloxane has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 1,1,1,3,5,5,5-Heptamethyltrisiloxane?
For 1,1,1,3,5,5,5-Heptamethyltrisiloxane, Upstream Products: Dichloromethylsilane, Hexamethyldisiloxane, Chlorotrimethylsilane; Downstream Products: 3-Aminopropylbis(trimethylsiloxy)methylsilane, Ethoxytrimethylsilane, (3-Glycidoxypropyl)bis(trimethylsiloxy)methylsilane.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1,1,1,3,5,5,5-Heptamethyltrisiloxane (CAS 1873-88-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1359647-9 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.