Product Identification

Product Name

2-Methyl-2,5-cyclohexadiene-1,4-dione

Synonyms

2-Methylbenzoquinone
2-Methyl-p-benzoquinone
Methyl-1,4-benzoquinone
Methylbenzoquinone
Methyl-p-benzoquinone
p-Toluquinone

CAS

553-97-9

Formula

C7H6O2

Molecular Weight

122.12

EINECS

209-056-2

RTECS

DK6300000

RTECS Class

Agricultural Chemical and Pesticide; Mutagen

Beilstein/Gmelin

9172366

EC Class

toxic, irritant

Physical and Chemical Properties

Appearance

Yellow plates or needles.

Solubility in water

Slightly soluble

Melting Point

65 - 67

Boiling Point

187

Vapor Pressure

0.66 (25 C)

Density

1.08 g/cm3 (75.5 C)

Partition Coefficient

.72

Heat Of Vaporization

42.3 kJ/mol

Heat Of Combustion

-3372 kJ/mol

Refractive Index

1.5049 (78 C)

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.

Eyes

Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Use with adequate ventilation.

Hazards Identification

Inhalation

Causes respiratory tract irritation. Can produce delayed pulmonary edema.

Skin

Causes skin irritation. May cause dermatitis. May cause discoloration, erythema, swelling, and the formation of papules and vesicles.

Eyes

Causes eye irritation. Contact may cause ulceration of the conjunctiva and cornea. May cause chemical conjunctivitis.

Ingestion

May cause gastrointestinal irritation with nausea, vomiting and diarrhea.

EC Risk Phrase

R 25 36/38

EC Safety Phrase

S 26 37 45

UN (DOT)

1325

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 protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.

Respirators

A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.

Exposure Effects

Effects may be delayed.

Fire Fighting Measures

Flash Point

65

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. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Fire Potential

Flammable/combustible material. May be ignited by friction, heat, sparks or flames.

Accidental Release Measures

Small spills/leaks

Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Disposal Code

9

Stability

Stable at room temperature in closed containers under normal storage and handling conditions.

Incompatibilities

Strong oxidizing agents.

Decomposition

Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Combustion Products

Fire may produce irritating and/or toxic gases.

Transport Information

UN Number

1325

Hazard Class

4.1

Packing Group

II; III

HS Code

2914 69 90