556-67-2
Product Name:
Octamethylcyclotetrasiloxane
Formula:
C8H24O4Si4
Synonyms:
Octamethylcyclotetrasiloxane;Octamethyltetrasiloxane
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Liquid |
|---|---|
| Color/Form | Oily liquid |
| Boiling Point | 175 °C |
| Melting Point | 17.5 °C |
| Flash Point | 55 °C (131 °F) - closed cup |
| Solubility | In water, 0.056 mg/L at 23 °C |
| Density | Specific gravity: 0.9558 |
| Vapor Pressure | 1.05 [mmHg] |
| LogP | log Kow = 6.74 (average of 3 measurements) |
| Henry's Law Constant | Henry's Law constant = 13.4 atm-cu m/mol at 25 °C |
| Stability/Shelf Life | Stable under recommended storage conditions. |
| Decomposition | When heated to decomposition it emits acrid smoke and irritating vapors. |
| Viscosity | 2.30 cSt at 25 °C |
| Heat of Vaporization | Enthalpy of vaporization: 44.1-48.5 kJ/mol |
| Refractive Index | Index of refraction: 1.3968 at 20 °C/D |
| Kovats Retention Index | 1004 1010 1010 1011 1013 1017 1017 1000 1006 1022 |
| Other Experimental Properties | Hydroxyl radical reaction rate constant = 1.01X10-12 cu cm/molec-sec at 25 °C |
| Chemical Classes | Metals -> Metalloid Compounds (Silicon) |
SAFETY INFORMATION
| Signal word | Warning |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Health Hazard GHS08  Environment GHS09 |
| GHS Hazard Statements |
H226:Flammable liquids H410:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P202:Do not handle until all safety precautions have been read and understood. P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P240:Ground/bond container and receiving equipment. P273:Avoid release to the environment. P308+P313:IF exposed or concerned: Get medical advice/attention. |
COMPUTED DESCRIPTORS
| Molecular Weight | 296.61 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 0 |
| Exact Mass | 296.07516538 g/mol |
| Monoisotopic Mass | 296.07516538 g/mol |
| Topological Polar Surface Area | 36.9 Ų |
| Heavy Atom Count | 16 |
| Formal Charge | 0 |
| Complexity | 197 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Octamethylcyclotetrasiloxane is a cyclosiloxane that is the octamethyl derivative of cyclotetrasiloxane. It is an organosilicon compound and a cyclosiloxane. It derives from a hydride of a cyclotetrasiloxane.