Methyltrimethoxysilane
Synonyms
Silane, methyltrimethoxy-;
Silane, trimethoxymethyl-;
Trimethoxy(methyl)silane;
Category
Silicone Surfactant
> Non-ionic Silicone Surfactant
>> Silicate, Silanol and their Derivatives
Chemical Numbering System
CAS: 1185-55-3
EINECS: 214-685-0
Molecular Formula & Molecular Weight
Molecular Formula: C4H12O3Si
Molecular Weight: 136.22
Structure
Properties
Appearance (1), colorless liquid.
Solubility react with water.
Stability stable. Easily hydrolyzed.
Risk Liquid form: irritation, irritation to skin, eye, respiratory system.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
rabbit skin LD |
> 10mL/kg[1] |
|
rat oral LD50 |
12.3mL/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent film-forming, adsorbing, dispersing abilities.
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, Product standards
(1), Chinese standards
(1a), GB/T 35501 Methyltrimethoxysilane for industrial use
4, 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 coupling agent.
Use as film-forming agent.
Use as surface modifying agent.
2, Personal care products
Film-forming agent in personal care products.
Manufacturers
References
[1]: ChemIDplus. 1185-55-3, Methyltrimethoxysilane
Update: 20140828(1); 20200808(2);