Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information
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Hexamethyldisiloxane(107-46-0)

Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information

Product Identification

Product Name
Hexamethyldisiloxane
Synonyms
Poly(dimethylsiloxane)
CAS
107-46-0
Formula
C6H18OSi2
Molecular Weight
162.38
EINECS
203-492-7
RTECS
JM9237000
RTECS Class
Primary Irritant
Beilstein/Gmelin
1736258
Beilstein Reference
4-04-00-04018
EC Class
highly flammable

Physical and Chemical Properties

Appearance
Fluid.
Solubility in water
Insoluble
Melting Point
-59
Boiling Point
101
Vapor Pressure
51 (30 C)
Density
0.764 g/cm3 (20 C)
Heat Of Vaporization
34.8 kJ/mol
Usage
Hydraulic fluid organo silicate mlo 5277.
Refractive Index
1.3774 (20 C)

First Aid Measures

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.

Handling and Storage

Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Keep under a nitrogen blanket. Flammables-area.
Handling
Use spark-proof tools and explosion proof equipment. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes. Use only in a chemical fume hood.

Hazards Identification

Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
Skin
Causes mild skin irritation.
Eyes
May cause eye irritation.
Ingestion
The toxicological properties of this substance have not been fully investigated. May be harmful if swallowed.
Hazards
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.
EC Risk Phrase
R 11
EC Safety Phrase
S 16 33
UN (DOT)
1993

Exposure Controls/Personal Protection

Personal Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. 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.
Exposure Effects
The toxological properties of this substance have not been fully investigated.
Poison Class
-

Fire Fighting Measures

Flash Point
4
Autoignition
340
Fire Fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Containers may explode in the heat of a fire. Extinguishing media: Use carbon dioxide or dry chemical.
Upper exp. limit
21.8
Lower exp. limit
.5
Fire Potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.

Accidental Release Measures

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 and Reactivity

Disposal Code
24
Stability
No data.
Incompatibilities
Strong acids - strong bases - strong oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide, silicon oxide.
Combustion Products
Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number
1993
Hazard Class
3
Packing Group
I; II; III
HS Code
2931 00 95
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