Product Identification

Product Name

Lithium hexamethyldisilazide

Synonyms

Lithium hexamethyldisilazane
N-Lithiohexamethyldisilazane
Silanamine, 1,1,1-trimethyl-N-(trimethylsilyl)-, lithium salt

CAS

4039-32-1

Formula

C6H18LiNSi2

Molecular Weight

168.33

EINECS

223-725-6

Beilstein/Gmelin

3567910

Physical and Chemical Properties

Appearance

White solid. Slight odor.

Melting Point

105 - 107

Boiling Point

80 - 84 (0.01 torr)

Density

0.89 g/cm3

First Aid Measures

Ingestion

Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.

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 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.

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. 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.

Hazards Identification

Ingestion

Causes gastrointestinal tract burns. The toxicological properties of this substance have not been fully investigated.

Inhalation

May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. Causes chemical burns to the respiratory tract. The toxicological properties of this substance have not been fully investigated. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.

Skin

Causes skin burns.

Eyes

Causes eye burns.

EC Risk Phrase

R 11 14 19 34

EC Safety Phrase

S 26 36/37/39 43 45

UN (DOT)

2924

Exposure Controls/Personal Protection

Personal 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.

Fire Fighting Measures

Flash Point

-21

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. Water Reactive. Material will react with water and may release a flammable and/or toxic gas. Flammable solid. Extinguishing media: Use foam, dry chemical, or carbon dioxide. DO NOT USE WATER!

Accidental Release Measures

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container. Remove all sources of ignition. Use a spark-proof tool. Provide ventilation.

Stability and Reactivity

Stability

Stable at normal temperatures in tightly closed containers under an inert atmosphere.

Incompatibilities

Strong oxidizing agents, acids, alcohols, ketones (e.g. acetone, acetophenone, MEK, MIBK), esters (e.g. butyl acetate, ethyl acetate, propyl formate), halogens, carbon dioxide.

Decomposition

Nitrogen oxides, carbon monoxide, carbon dioxide, silicon oxide, lithium hydroxide, ammonia.

Transport Information

UN Number

2924