Product Identification

Product Name

Diethyl methylphosphonate

Synonyms

1-(Ethoxy-methylphosphoryl)oxyethane
DEMP
Diethoxymethylphosphine oxide
Diethyl methanephosphonate
O,O-Diethyl methylphosphonate

CAS

683-08-9

Formula

C5H13O3P

Molecular Weight

152.15

EINECS

211-667-4

RTECS

SZ9085000

RTECS Class

Other

Beilstein/Gmelin

1753416

Physical and Chemical Properties

Appearance

Colorless liquid

Solubility in water

Soluble

Boiling Point

190 - 194

Density

1.0406 g/cm3 (30C)

Refractive Index

1.4101 (30 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.

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 lids. Get medical aid. 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.

Handling

Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.

Hazards Identification

Ingestion

May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.

Inhalation

Causes respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.

Skin

Causes skin irritation.

Eyes

Causes eye irritation.

EC Risk Phrase

R 36/37/38

EC Safety Phrase

S 26 36

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate protective eyeglasses or chemical safety goggles, protective gloves and clothing to prevent 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

75

Fire Fighting

Wear approved SCBA in full pressure-demand and full protective gear. Combustible Liquid. In case of fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Accidental Release Measures

Small spills/leaks

Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container.

Stability and Reactivity

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents, strong bases.

Decomposition

Carbon monoxide, oxides of phosphorus, carbon dioxide.