Octamethylcyclotetrasiloxane
- Product NameOctamethylcyclotetrasiloxane
- CAS556-67-2
- CBNumberCB4490223
- MFC8H24O4Si4
- MW296.62
- EINECS209-136-7
- MDL NumberMFCD00003269
- MOL File556-67-2.mol
Chemical Properties
| Melting point: | 17–18 °C (63–64 °F; 290–291 K) |
| Boiling point: | 175–176 °C (347–349 °F; 448–449 K) |
| Density | 0.956 g/mL |
| vapor density | 1 (vs air) |
| vapor pressure | 1.32hPa at 25℃ |
| refractive index | 1.40 |
| Flash point: | 54 °C |
| storage temp. | Store below +30°C. |
| solubility | <0.001g/l Hydrolysis |
| form | clear liquid |
| color | Colorless to Almost colorless |
| Specific Gravity | 0.956 |
| explosive limit | 0.4-11.7%(V) |
| biological source | rabbit |
| Water Solubility | INSOLUBLE |
| Sensitive | Moisture Sensitive |
| Merck | 14,6747 |
| BRN | 1787074 |
| Henry's Law Constant | 7.3×10-7 mol/(m3Pa) at 25℃, Xu and Kropscott (2014) |
| Dielectric constant | 2.4(20℃) |
| Cosmetics Ingredients Functions | SOLVENT SKIN CONDITIONING - EMOLLIENT HAIR CONDITIONING |
| InChI | 1S/C8H24O4Si4/c1-13(2)9-14(3,4)11-16(7,8)12-15(5,6)10-13/h1-8H3 |
| InChIKey | HMMGMWAXVFQUOA-UHFFFAOYSA-N |
| SMILES | C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 |
| LogP | 6.98 at 21.7℃ |
| CAS DataBase Reference | 556-67-2(CAS DataBase Reference) |
| NIST Chemistry Reference | Cyclotetrasiloxane, octamethyl-(556-67-2) |
| EPA Substance Registry System | Octamethylcyclotetrasiloxane (556-67-2) |
Safety
| Symbol(GHS) |
   GHS02,GHS08,GHS09 |
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| Signal word | Warning | |||||||||
| Hazard statements | H226-H361f-H410 | |||||||||
| Precautionary statements | P202-P210-P233-P240-P273-P308+P313 | |||||||||
| PPE | Eyeshields, Gloves, type ABEK (EN14387) respirator filter | |||||||||
| Hazard Codes | Xn | |||||||||
| Risk Statements | 53-62-10 | |||||||||
| Safety Statements | 36/37-46-51-61 | |||||||||
| RIDADR | UN 1993 3/PG 3 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | GZ4397000 | |||||||||
| Autoignition Temperature | 400°C | |||||||||
| TSCA | TSCA listed | |||||||||
| HazardClass | 3 | |||||||||
| PackingGroup | III | |||||||||
| HS Code | 2931900001 | |||||||||
| Storage Class | 3 - Flammable liquids | |||||||||
| Hazard Classifications |
Aquatic Acute 1 Aquatic Chronic 1 Flam. Liq. 3 Repr. 2 |
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| Hazardous Substances Data | 556-67-2(Hazardous Substances Data) | |||||||||
| Toxicity | LD50 oral in rat: 1540mg/kg | |||||||||
| REACH Registrations | Active | |||||||||
| NFPA 704: |
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