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