Trimethoxysilane

  • Silane, trimethoxy-
Formula
C3H10O3Si
Structure
Description
A colorless liquid.
Uses
Used to prepare a number of organic coupling agents utilized by the plastics industry as adhesion promotors.

Registry Numbers and Inventories.
CAS
2487-90-3
EC (EINECS/ELINCS)
219-637-2
RTECS
VV6750000
RTECS class
Primary Irritant
UN (DOT)
9269
Beilstein/Gmelin
1697990
Beilstein Reference
4-01-00-01266
Swiss Giftliste 1
G-4843
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H10O3Si
Formula mass
122.22
Melting point, °C
-114.8
Boiling point, °C
81 - 83
Vapor pressure, mmHg
76
Vapor density (air=1)
>1
Density
0.9601 g/cm3
Solubility in water
Decomposes.
Refractive index
1.359 (20 C)
Heat of vaporization
36.77 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard.
Stability
No data.

Fire.
Flash Point,°C
-4
Fire fighting
Use water in flooding quantities as fog. Use foam, dry chemical, or carbon dioxide. Keep run-off water out of sewers and water sources. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Flammable/combustible material.
Hazards
May be ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
4
 
Flammability
3
 
 
Reactivity
2
 

Health.
Poison_Class
5
Exposure effects
   Ingestion
May cause toxic effects.
   Inhalation
Respiratory tract irritation may be seen.
   Skin
Contact with substance may cause severe burns.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
9269
Response guide
Hazard class
6.1
PRTC
T
Packing Group
I
 
Std. Transport #
4921213