Product Identification

Product Name

Diethyl hydrogen phosphonate

Synonyms

Diethyl acid phosphite
Diethyl phosphite
Diethyl phosphonate
Hydrogen diethyl phosphite

CAS

762-04-9

Formula

C4H11O3P

Molecular Weight

138.12

EINECS

212-091-6

RTECS

TG7875000

RTECS Class

Other

Beilstein/Gmelin

605759

Beilstein Reference

4-01-00-01329

Physical and Chemical Properties

Appearance

Clear, colorless liquid.

Solubility in water

Soluble

Boiling Point

50

Vapor Pressure

< 2

Density

1.093 g/cm3 (0 C)

Heat Of Vaporization

38.10 kJ/mol

Usage

Textile finishing agent, antioxidant, additive for adhesives & for extreme pressure lubricant, chemical intermediate for organic phosphorus compounds.

Refractive Index

1.4057 (18.4 C)

First Aid Measures

Ingestion

Do NOT induce vomiting. Allow the victim to rinse his mouth and then to drink 2-4 cupfuls of water, and seek medical advice.

Inhalation

Remove from exposure to fresh air immediately.

Skin

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.

Eyes

Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Handling and Storage

Storage

Store in a cool, dry place. Keep container closed when not in use.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.

Hazards Identification

Inhalation

Harmful by inhalation.

Skin

Irritating. Harmful on contact with the skin.

Hazards

During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion.

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate safety goggles, protective clothing and gloves.

Respirators

Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.

Exposure Effects

The toxological properties of this substance have not been fully investigated.

Poison Class

5

Fire Fighting Measures

Flash Point

90

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. In case of fire, use water, dry chemical, chemical foam, or alcohol-resistant 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. Clean up spills immediately, using the appropriate protective equipment.

Stability and Reactivity

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents - moist air or water - strong bases - strong acids - acid chlorides.

Decomposition

Phosphine, carbon monoxide, oxides of phosphorus, irritating and toxic fumes and gases, carbon dioxide.