Hexamethyldisiloxane
CAS 107-46-0
EC 203-492-7
Formula C6H18OSi2
MW 162.38 g/mol
Silicones & Silicates Personal Care & CosmeticsPlastics & PolymersCoatings, Adhesives, Sealants & Elastomers Surface Modification & WettingCross-linking & CuringSolvent & CarrierEmulsification & Dispersion
Description
Hexamethyldisiloxane (CAS 107-46-0) is a low-molecular-weight linear siloxane fluid, commercially available under trade names including Belsil DM 0.65, OS 10, and SWS-F 221, and commonly abbreviated as HMDO. It carries no assigned E-code and is classified under HS code 29310095 within the Silicones and Silicates category.
In personal care formulations, HMDO functions as a lightweight emollient and carrier solvent, reducing surface tension to improve spreadability of active ingredients across skin and hair. In coatings and adhesive systems, it acts as a reactive diluent and adhesion promoter, where its siloxane backbone facilitates surface wetting and cross-linking at substrate interfaces to improve bond durability.
HMDO is supplied in standard industrial grades compliant with REACH registration requirements. Packaging is available in drums and IBC containers suited to industrial procurement volumes. Buyers should confirm grade specifications against application requirements, particularly for cosmetic or polymer end uses.
In personal care formulations, HMDO functions as a lightweight emollient and carrier solvent, reducing surface tension to improve spreadability of active ingredients across skin and hair. In coatings and adhesive systems, it acts as a reactive diluent and adhesion promoter, where its siloxane backbone facilitates surface wetting and cross-linking at substrate interfaces to improve bond durability.
HMDO is supplied in standard industrial grades compliant with REACH registration requirements. Packaging is available in drums and IBC containers suited to industrial procurement volumes. Buyers should confirm grade specifications against application requirements, particularly for cosmetic or polymer end uses.
Physical Properties
| Melting Point | -66 °C |
| Boiling Point | 99.5 °C |
| Density | 0.7638 g/cm³ @ Temp: 20 °C |
| Flash Point | 33 °F |
| Appearance | Colorless or yellowish transparent liquid |
| Color | Colorless to Almost colorless |
| Form | liquid |
| Water Solubility | insoluble |
| Vapor Pressure | 20 hPa (20 °C) |
| Refractive Index | n 20/D 1.377(lit.) |
| Log P | 5.06 at 20℃ |
Safety & Handling (Learn More)
Danger GHS02 GHS09 GHS07 GHS08
H
H225H315H332H372H400H410H411
P
P210P233P240P241P242P243P260P261P264P270P271P273P280P317P319P321P391P501P302+P352P304+P340P332+P317P362+P364P370+P378P403+P235P303+P361+P353
Trade & Regulatory
| HS Code | 29310095 |
| UN Number | 1993 |
| ADR Class | 3 |
| Packing Group | II |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 3 |
Other Names
trimethyl(trimethylsilyloxy)silaneoxybis(trimethylsilane)HMDOHMDSOS 10HMDSOSWS-F 221((CH3)3Si)2OSILICONE FLUID
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Raw Materials
Derivatives
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