Substance profile
Octamethylcyclotetrasiloxane
Octamethylcyclotetrasiloxane is an oily liquid.
01 · Identification
What Octamethylcyclotetrasiloxane is
Octamethylcyclotetrasiloxane is an oily liquid. It boils at 175 °C, melts at 17.5 °C.
Under the GHS it carries the signal word Warning.
Other names for Octamethylcyclotetrasiloxane
- [D4]
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
03 · Physical and chemical properties
Octamethylcyclotetrasiloxane properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 175 °C (347 °F) | HSDB | |
| 175 °C (347 °F) | at 760 mmHg | DOE PAC | |
| Melting point | 17.5 °C (63.5 °F) | HSDB | |
| Density | 0.9558 g/cm³ | HSDB | |
| 0.96 g/cm³ | ICSC | ||
| 0.9558 g/cm³ | at 25 °C | DOE PAC | |
| Solubility | Soluble in carbon tetrachloride | HSDB | |
| In water, 0.056 mg/L at 23 °C | at 23 °C | HSDB | |
| In synthetic seawater water, 0.033 mg/L at 25 °C | at 25 °C | HSDB | |
| Vapor pressure | 0.9998 mmHg | at 21.7 °C | ICSC |
| 1.05 mmHg | at 25 °C | HSDB | |
| 1.05 mmHg | Haz-Map | ||
| Flash point | 55 °C (131 °F) | HSDB | |
| 56 °C (132.8 °F) | ICSC | ||
| Critical temperature and pressure | 312.55 °C (594.6 °F) | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Octamethylcyclotetrasiloxane
Storage conditions
Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. Storage class (TRGS 510): Flammable liquids.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Incompatible materials: Strong oxidizing agents, acids, bases.
Source: Hazardous Substances Data Bank (HSDB)
Planning storage for a mix of chemicals? Check Octamethylcyclotetrasilox… in the storage compatibility matrix →