Tetramethyl-1,3-dichlorodisiloxane

  • Bis(chlorodimethylsilyl) oxide
  • Bis(chlorodimethylsilyl) ether
  • 1,3-Dichlorotetramethyldisiloxane
  • 1,3-Dichloro-1,1,3,3-tetramethyldisiloxane
  • 1,1,3,3-Tetramethyl-1,3-dichlorodisiloxane
Formula
C4H12Cl2OSi2
Structure
Description
Straw-colored - amber liquid. Acrid odor.

Registry Numbers and Inventories.
CAS
2401-73-2
EC (EINECS/ELINCS)
219-278-1
R 11 34
S 16 26 36/37/39 45
UN (DOT)
2985
Beilstein/Gmelin
1741218
Beilstein Reference
4-04-00-04119
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed

Properties.
Formula
C4H12Cl2OSi2
Formula mass
203.21
Melting point, °C
26 - 27
Boiling point, °C
40 - 41 (0.5 torr)
Density
1.038 g/cm3 (20 C)
Solubility in water
Insoluble
Refractive index
1.41 (20 C)

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Flammables-area. Store under an inert atmosphere.
Handling
Use spark-proof tools and explosion proof equipment. Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Use only in a chemical fume hood.
Protection
Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. Use a spark-proof tool.
Stability
Stable under normal shipping and handling conditions.
Incompatibilities
Oxidizing materials, strong oxidizing agents, acids, bases, alcohols, amines.
Decomposition
Hydrogen chloride, carbon monoxide, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
15
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Combustion generates toxic fumes. Will burn if involved in a fire. Containers may explode if exposed to fire. Extinguishing media: Use foam, dry chemical, or carbon dioxide.

Health.
Exposure effects
   Ingestion
Causes gastrointestinal tract burns.
   Inhalation
Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema. May cause burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea, and vomiting.
   Skin
Causes skin burns. May cause dermatitis.
   Eyes
Causes eye burns.

First aid
 
   Ingestion
Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
2985
Response guide