Product Identification

Product Name

Dihydro-2H-pyran-2,6(3H)-dione

Synonyms

2H-Pyran-2,6(3H)-dione, dihydro-
Glutaric acid anhydride
Pentanedioic acid anhydride
Pentanedioic anhydride
Pyroglutaric acid

CAS

108-55-4

Formula

C5H6O3

Molecular Weight

114.1

EINECS

203-593-6

RTECS

MA3850000

RTECS Class

Other

Beilstein/Gmelin

110051

Beilstein Reference

5-17-11-00009

EC Class

harmful, irritant

Physical and Chemical Properties

Appearance

White powder.

Solubility in water

Very soluble

Melting Point

52 - 55

Boiling Point

287

Vapor Pressure

0.003 (25 C)

Density

1.411 g/cm3

Partition Coefficient

-.92

Heat Of Vaporization

52.6

Heat Of Combustion

-2207 kJ/mol

First Aid Measures

Ingestion

Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. 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

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

Handling

Wash thoroughly after handling. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.

Hazards Identification

Ingestion

May cause central nervous system depression. May cause gastrointestinal tract damage. May be harmful if swallowed.

Inhalation

Causes respiratory tract irritation.

Skin

Causes skin irritation. If absorbed, may cause symptoms similar to those for ingestion. May be harmful if absorbed through the skin.

Eyes

Causes eye irritation.

EC Risk Phrase

R 21/22 37/38 41

EC Safety Phrase

S 26 36/37/39

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 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.

Poison Class

4

Fire Fighting Measures

Flash Point

120

Autoignition

320

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Do NOT use water directly on fire. Use foam, dry chemical, or carbon dioxide.

Upper exp. limit

13.1

Lower exp. limit

2

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions.

Stability and Reactivity

Disposal Code

4

Stability

May decompose on exposure to moist air or water.

Incompatibilities

Strong oxidizing agents, acids, bases, alcohols, amines.

Decomposition

Carbon monoxide, carbon dioxide, acrid smoke and fumes.

Transport Information

HS Code

2917 19 90