Dodecamethylpentasiloxane

Formula
C12H36O4Si5
Structure
Description
Colorless liquid. Slight odor.
Uses
Used as a a basis for silicone oils or fluids designed to withstand extremes of temperature.

Registry Numbers and Inventories.
CAS
141-63-9
EC (EINECS/ELINCS)
205-492-2
RTECS
SB0970000
RTECS class
Other
Merck
12,3463
Beilstein/Gmelin
1792965
Beilstein Reference
4-04-00-04124
Swiss Giftliste 1
G-4330
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C12H36O4Si5
Formula mass
384.84
Melting point, °C
-81
Boiling point, °C
229
Vapor pressure, mmHg
25 (122 C)
Density
0.8755 g/cm3
Solubility in water
Insoluble
Viscosity
1.50 cp (38 C)
Surface tension
16 g/s2 (50 C)
Refractive index
1.3917
Heat of vaporization
53.2 kJ/mol
Heat of combustion
-11539 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container. Store under nitrogen.
Handling
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes. 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.
Stability
Stable under normal shipping and handling conditions.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide, silicon oxide.

Fire.
Flash Point,°C
86
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Health.
Poison_Class
-
Exposure effects
   Ingestion
May cause irritation of the digestive tract. May be harmful if swallowed.
   Inhalation
Causes respiratory tract irritation. May be harmful if inhaled.
   Skin
Causes skin irritation. May be harmful if absorbed through the skin.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.