Hexamethyldisiloxane CAS 107-46-0
Introduction：Basic information about Hexamethyldisiloxane CAS 107-46-0, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.
Hexamethyldisiloxane Basic information
| Product Name: | Hexamethyldisiloxane |
| Synonyms: | os10;oxybis(trimethyl-silan;Oxybis(trimethylsilane);Silane, oxybis(trimethyl)-;sws-f221;SILICONE FLUID;2,2,4,4-TETRAMETHYL-3-OXA-2,4-DISILAPENTANE;HMDO |
| CAS: | 107-46-0 |
| MF: | C6H18OSi2 |
| MW: | 162.38 |
| EINECS: | 203-492-7 |
| Product Categories: | Chemical Synthesis;Organometallic Reagents;Siloxanes;Intermediates & Fine Chemicals;Pharmaceuticals;Organosilicon;Organics;Si (Classes of Silicon Compounds);Silicon Compounds (for Synthesis);Si-O Compounds;Synthetic Organic Chemistry;API Intermediate;1;T0001;107-46-0;YP00036;K00001 |
| Mol File: | 107-46-0.mol |
Hexamethyldisiloxane Chemical Properties
| Melting point | −59 °C(lit.) |
| Boiling point | 101 °C(lit.) |
| density | 0.764 g/mL at 20 °C(lit.) |
| vapor density | >1 (vs air) |
| vapor pressure | 20 hPa (20 °C) |
| refractive index | n |
| Fp | 33 °F |
| storage temp. | Store below +30°C. |
| solubility | 0.00037g/l insoluble |
| form | liquid |
| color | Colorless to Almost colorless |
| Specific Gravity | 0.76 |
| explosive limit | 0.5-21.8%(V) |
| Water Solubility | insoluble |
| Hydrolytic Sensitivity | 1: no significant reaction with aqueous systems |
| BRN | 1736258 |
| Dielectric constant | 2.2（20℃） |
| Stability: | Stable, but moisture sensitive. Highly flammable. Incompatible with strong acids, strong bases, oxidizing agents. |
| Cosmetics Ingredients Functions | ANTIFOAMING SKIN CONDITIONING - MISCELLANEOUS |
| InChI | 1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3 |
| InChIKey | UQEAIHBTYFGYIE-UHFFFAOYSA-N |
| SMILES | C[Si](C)(C)O[Si](C)(C)C |
| LogP | 5.06 at 20℃ |
| CAS DataBase Reference | 107-46-0(CAS DataBase Reference) |
| NIST Chemistry Reference | Disiloxane, hexamethyl-(107-46-0) |
| EPA Substance Registry System | Hexamethyldisiloxane (107-46-0) |
Safety Information
| Hazard Codes | F,N,T |
| Risk Statements | 11-50/53-65-51/53-48/23/24/25-36/38-46-45 |
| Safety Statements | 16-61-62-45-26-53 |
| RIDADR | UN 1993 3/PG 2 |
| WGK Germany | 3 |
| RTECS | JM9237000 |
| F | 10 |
| Autoignition Temperature | 340 °C |
| TSCA | TSCA listed |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29310095 |
| Storage Class | 3 - Flammable liquids |
| Hazard Classifications | Aquatic Acute 1 Aquatic Chronic 1 Flam. Liq. 2 |
| Hazardous Substances Data | 107-46-0(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: > 12160 mg/kg LD50 dermal Rat > 2000 mg/kg |
| Chemical Properties | Hexamethyldisiloxane(HMDS) has a very low water solubility and is highly volatile. It is therefore difficult to perform biodegradability and toxicity tests. Experimental data on degradation in water are not available. Based on chemical structure, no aerobic biodegradation of HMDS in water is expected. The half-life of HMDS in marine water is thus expected to be more than 60 days and the persistence (P) criterion is fulfilled. |
| Physical properties | Hexamethyldisiloxane is a colorless and transparent liquid. It is easily deliquescent, flammable, and has the risk of causing combustion when exposed to high heat, open flame, and strong oxidizing agents. Boiling point 99.5℃. Flash point -1.1℃. Relative density (d2525) 0.7606. refractive index 1.3750. insoluble in water, soluble in many organic solvents. |
| Uses | The most popular precursor chemical is hexamethyldisiloxane (HMDS) which with the addition of helium and oxygen will produce a silica coating. it is used in a variety of consumer applications and can be used as intermediates in the production of silicone polymers. |
| Uses | Hexamethyldisiloxane is used as a base fluid in a wide range of personal care products that require fast evaporation and high spreadability. When blended with Dimethicone fluids, It can adjust the residence time of the silicone on the skin. Unlike other volatile fluids, Hexamethyldisiloxane Fluid does not cool the skin as it evaporates. Hexamethyldisiloxane is used as a carrying agent and diluent in the following: skin cream lotions, bath oils, suntan lotions, nail polishes, antiperspirants, deodorants, hair sprays and other beauty and hair care products. A silicon based compound that can be used to create potentially biocompatible materials. Used as a monomer in the synthesis of long chain polysiloxane structures. Used in the methylation of mercury(II) salts. |
| Uses | Hexamethyldisiloxane can be used as silylating agent for carboxylic acids, and alcohols; used inpreparation of aroyl chlorides; precursor for a variety of trimethylsilylderivatives.Hexamethyldisiloxane has been used as an inexpensive starting material for the preparation of numerous synthetically useful trimethylsilyl derivatives. |
| Preparation | Synthesis of hexamethyldisiloxane by hydrolysis of trimethylsilyl chloride, water and sodium hydroxide. |
| Definition | ChEBI: Hexamethyldisiloxane is an organosiloxane consisting of two trimethylsilyl groups covalently bound to a central oxygen. |
| Production Methods | Produced via acid hydrolysis of chlorotrimethylsilane andpurification by distillation. |
| General Description | Hexamethyldisiloxane (HMDSO), a linear polydisiloxane, is an organosilicon reagent commonly utilized as a source for plasma enhanced chemical vapor deposition (PE-CVD) of thin films of silicon compounds. It is also employed as a substitute to silane in silicon integrated circuit technology. Its dissociative ionization by electron impact has been studied by Fourier transform mass spectrometry. Synthesis of plasma-polymerized HMDSO thin films by atmospheric pressure glow (APG) discharge has been reported. Crystals of HMDSO at 148K are monoclinic. Addition of HMDSO to P4S10, improves its efficiency as thionating agent. |
| Flammability and Explosibility | Highly flammable |
| reaction suitability | reagent type: derivatization reagent reaction type: Silylations |
| Purification Methods | Fractionally distil through a column packed with glass helices with ca 15 theoretical 20 1.3777. plates. It is highly flammable and is an irritant. [Mills & McKenzie J Am Chem Soc 76 2672 1954, Csakvari et al. J Organometal Chem 107 287 1976, Beilstein 4 IV 4018.] |
| Toxics Screening Level | The ITSL for hexamethyldisiloxane is 240 μg/m3 based on an annual averaging time for dispersion modeling. |
Hexamethyldisiloxane Preparation Products And Raw materials
| Raw materials | Chlorotrimethylsilane-->N-Methylaniline-->(chlorodifluoroMethyl)triMethylsilane-->Silane, trimethyl(trifluoroethenyl)--->Silane, 1,1'-(difluoromethylene)bis[1,1,1-trimethyl--->(Difluoromethyl)trimethylsilane-->CHLORODIMETHYLVINYLSILANE-->1,1,1,3,5,5,5-Heptamethyltrisiloxane-->Divinyltetramethyldisiloxane-->VINYLPENTAMETHYLDISILOXANE-->1,1,1,3,3,5,5-HEPTAMETHYLTRISILOXANE-->DECAMETHYLTETRASILOXANE-->Pentamethyldisiloxane |
| Preparation Products | 2-BROMO-1-(2-(TRIFLUOROMETHYL)THIAZOL-5-YL)ETHANONE-->2-(TRIFLUOROMETHYL)THIAZOLE-5-CARBALDEHYDE-->5-(CHLOROMETHYL)-2-(TRIFLUOROMETHYL)THIAZOLE-->1,2-DIIODOETHANE-->ETHYL 2-(TRIFLUOROMETHYL)THIAZOLE-5-CARBOXYLATE-->(2-(TRIFLUOROMETHYL)THIAZOL-5-YL)METHANOL-->Iodotrimethylsilane-->Xanthophyll-->Dibutyl sulfide |
