Description and features
SilQon OMCTS ( Octamethylcyclotetrasiloxane ) is a clear liquid which has C8H24O4Si4 as chemical formula.
It is a cyclic organic silicon substance that functions as a monomer in producing silicone polymers, including rubber, resins, and greases. Additionally, we refer to octamethylcyclotetrasiloxane as D4.
Availability
Europe and United States: Provided SilQon OMCTS is in stock in our local warehouses our lead time is about one week if delivered in 200 KG steel drums.
We can also serve Canada, South America, South Africa, and other markets. Please contact our sales department for more details.
This product (CAS: 556-67-2) has been registered (FULL substance) under REACH (EC) 1907/2006.
Product Identification
| CAS number | 556-67-2 |
| EC number | 209-136-7 |
| HS code | 2931 90 00 |
| EC name | Octamethylcyclotetrasiloxane |
| IUPAC name | Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane |
Specification
| Appearance | Colourless clear liquid |
| Assay | ≥ 99.00 % |
| Refractive index: | 1.3968 @ 25ºC |
Application
SilQon OMCTS is used as a monomer in the production of silicone polymers and as an intermediate in the production of other organosilicon substances. Further it finds its application in electronics, textiles, personal care products and household care products.
Packaging
Available packaging: 180 KG steel drums / IBC’s.
Special packaging is available on request.
Storage
Store octamethylcyclotetrasiloxane in a cool, dry, and well-ventilated area, and ensure compliance with legal requirements. Additionally, take care to keep it away from heat sources and incompatible materials to maintain safety.
MSDS
A Material Safety Data Sheet (MSDS) is available for SilQon OMCTS and all other products supplied by Vesta Chemicals BV.
An MSDS outlines the hazards of a product and explains how to handle, use, and store the product safely. Besides it provides important regulatory and emergency response information for the purchased product.
Molecular and structural information
| Molecular formula | C8H24O4Si4 |
| Molecular weight | 296.61 g/mol |
| InChi key | HMMGMWAXVFQUOA-UHFFFAOYSA-N |
| Smiles | C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C |
| Chemical formula |  |
Physicochemical information
| Boiling point | 175 ºC @ 101 325 Pa |
| Bulk density | 0.95 g/cm3 @ 25 ºC |
| Flash point | 51 ºC @ 101 325 Pa |
| Log Pow | 6.49 @ 25.1 ºC |
| Solubility in water | 0.056 mg/L @ 25 ºC |
| Vapor pressure | 132 Pa @ 25 ºC |