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.
02 · Identifiers
Octamethylcyclotetrasiloxane identifiers and molecular data
Octamethylcyclotetrasiloxane CAS number and EC number
Other names for Octamethylcyclotetrasiloxane
- [D4]
03 · GHS classification
Octamethylcyclotetrasiloxane hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Octamethylcyclotetrasiloxane pictograms and signal word
Octamethylcyclotetrasiloxane hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
Octamethylcyclotetrasiloxane hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H361f | Suspected of damaging fertility. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Octamethylcyclotetrasiloxa…. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Octamethylcyclotetrasiloxa…
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Octamethylcyclotetrasi… issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Octamethylcyclotetrasiloxane precautionary statements
CLP Annex VI assigns 3 precautionary statements to Octamethylcyclotetrasiloxa…. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Disposal
What has to happen to the contents and the empty container.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Octamethylcyclotetrasiloxane name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | октаметилциклотетрасилоксан |
| Spanish español | Octametilciclotetrasiloxano |
| Czech čeština | oktamethylcyklotetrasiloxan |
| Danish dansk | octamethylcyclotetrasiloxan |
| German Deutsch | Octamethylcyclotetrasiloxan |
| Estonian eesti | Oktametüültsüklotetrasiloksaan |
| Greek ελληνικά | οκταμεθυλοκυκλοτετρασιλοξάνιο |
| English English | octamethylcyclotetrasiloxane |
| French français | octaméthylcyclotétrasiloxane |
| Croatian hrvatski | oktametilciklotetrasiloksan |
| Italian italiano | ottametilciclotetrasilossano |
| Latvian latviešu | oktametilciklotetrasiloksāns |
| Lithuanian lietuvių | oktametilciklotetrasiloksanas |
| Hungarian magyar | oktametilciklotetrasziloxán |
| Maltese Malti | ottametilċiklotetrasiloksan |
| Dutch Nederlands | octamethylcyclotetrasiloxaan |
| Polish polski | oktametylocyklotetrasiloksan |
| Portuguese português | octametilciclotetrassiloxano |
| Romanian română | octametilciclotetrasiloxan |
| Slovak slovenčina | oktametylcyklotetrasiloxán |
| Slovenian slovenščina | oktametilciklotetrasiloksan |
| Finnish suomi | oktametyylisyklotetrasiloksaani |
| Swedish svenska | oktametylcyklotetrasiloxan |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Octamethylcyclotetrasiloxane GHS label elements
Everything CLP Annex VI fixes for Octamethylcyclotetrasiloxa…, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Warning
Octamethylcyclotetrasiloxane
- Suspected of damaging fertility.
- Very toxic to aquatic life with long lasting effects.
- Avoid release to the environment.
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Octamethylcyclotetrasiloxa… in the GHS label constructor →
07 · Health hazards
Octamethylcyclotetrasiloxane health hazards and exposure limits
Octamethylcyclotetrasiloxane hazard summary
No listed effects of short-term or long-term exposure; Can be absorbed through skin; [ICSC] Volunteers were exposed to 10 ppm for 1 hour and then again 3 months later; No immunotoxic or inflammatory effects were detected; Silicones cause foreign body reactions when injected or implanted in tissues; [HSDB] An irritant; [MSDSonline]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · 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.
Octamethylcyclotetrasiloxane boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 175 °C (347 °F) | HSDB | |
| 175 °C (347 °F) | at 760 mmHg | DOE PAC |
Octamethylcyclotetrasiloxane melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 17.5 °C (63.5 °F) | HSDB |
Octamethylcyclotetrasiloxane density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 0.9558 g/cm³ | HSDB | |
| 0.96 g/cm³ | ICSC | ||
| 0.9558 g/cm³ | at 25 °C | DOE PAC |
Octamethylcyclotetrasiloxane solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| 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 |
Octamethylcyclotetrasiloxane vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.9998 mmHg | at 21.7 °C | ICSC |
| 1.05 mmHg | at 25 °C | HSDB | |
| 1.05 mmHg | Haz-Map |
Octamethylcyclotetrasiloxane flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | 55 °C (131 °F) | HSDB | |
| 56 °C (132.8 °F) | ICSC |
Octamethylcyclotetrasiloxane critical temperature and pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| 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.
09 · Handling and storage
Octamethylcyclotetrasiloxane storage 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)
Octamethylcyclotetrasiloxane 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 →
10 · Questions
Octamethylcyclotetrasiloxane — frequently asked questions
What is the CAS number of Octamethylcyclotetrasiloxane?
The CAS number of Octamethylcyclotetrasiloxane is 556-67-2. Its EC number is 209-136-7.
What does a Octamethylcyclotetrasiloxane label have to show?
Under CLP Annex VI the label for Octamethylcyclotetrasiloxane carries the pictograms Health hazard and Environment and the signal word is Warning.
Is Octamethylcyclotetrasiloxane flammable?
CLP Annex VI assigns Octamethylcyclotetrasiloxane no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it. The flash point reported for it is 55 °C (131 °F) (HSDB).
Is Octamethylcyclotetrasiloxane a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Octamethylcyclotetrasiloxane. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the boiling point of Octamethylcyclotetrasiloxane?
The boiling point reported for Octamethylcyclotetrasiloxane is 175 °C (347 °F) (HSDB).
What is the melting point of Octamethylcyclotetrasiloxane?
The melting point reported for Octamethylcyclotetrasiloxane is 17.5 °C (63.5 °F) (HSDB).
How should Octamethylcyclotetrasiloxane be stored?
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. (Hazardous Substances Data Bank (HSDB))
Nearby
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