Disiloxane
Synonyms
Disiloxane, 1,1,1,3,3,3-hexamethyl-;
Disiloxane, hexamethyl-;
Hexamethyldisiloxane;
Category
Silicone Surfactant
> Non-ionic Silicone Surfactant
>> Alkyl (Substituted Alkyl) Silicone Polymer
Chemical Numbering System
CAS: 107-46-0
EINECS: 203-492-7
Molecular Formula & Molecular Weight
Molecular Formula: C6H18OSi2; C6H18O1Si2
Molecular Weight: 162.38
Structure
Properties
Appearance (1), liquid.
Solubility insoluble in water.
Physical - chemical properties
|
Water solubility, mg/L |
0.93 (25 °C)[1] |
Stability stable.
Risk Liquid form: irritation, irritation to skin, eye, respiratory system.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
guinea pig oral LDLo |
50000mg/kg[2] |
|
mouse intraperitoneal LD50 |
4500mg/kg[2] |
|
rabbit skin LD50 |
16mL/kg[2] |
|
rat inhalation LC50 |
15956ppm/4H[2] |
|
rat intraperitoneal LDLo |
1825mg/kg[2] |
|
rat oral LDLo |
8mL/kg[2] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent lubricating, antistatic, dispersing, adsorbing abilities. Glow-discharg polymer.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Liquid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Liquid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances or furtherly test for microorganisms, according to local regulations and standards.
Major Uses
1, Typical applications
Use as solvent.
Use as lubricant.
Use as anti-foaming agent.
Use as hydraulic oil.
Use as hydrophilic coatings.
Use as intermediate in organic synthesis.
2, Personal care products
Conditioning agent, anti-foaming agent in personal care products.
Manufacturers
References
[1]: HSDB. 107-46-0, Hexamethyldisiloxane
[2]: ChemIDplus. 107-46-0, Hexamethyldisiloxane
Update: 20140828(1); 20200913(2);