Diethyl methylphosphonate

  • O,O-Diethyl methylphosphonate
  • Diethyl methanephosphonate
  • Diethoxymethylphosphine oxide
  • DEMP
Formula
C5H13O3P
Structure
Description
Colorless liquid

Registry Numbers and Inventories.
CAS
683-08-9
EC (EINECS/ELINCS)
211-667-4
R 36/37/38
RTECS
SZ9085000
RTECS class
Other
Beilstein/Gmelin
1753416
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C5H13O3P
Formula mass
152.15
Boiling point, °C
190 - 194
Density
1.0406 g/cm3 (30C)
Solubility in water
Soluble
Refractive index
1.4101 (30 C)

Hazards and Protection.
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.
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.
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 temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong bases.
Decomposition
Carbon monoxide, oxides of phosphorus, carbon dioxide.

Fire.
Flash Point,°C
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.

Health.
Exposure effects
   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.

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.
   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.

Transport.