Product Identification

Product Name

1-Hydroxy-2,3-dimethylbenzene

Synonyms

1-Hydroxy-2,3-dimethylbenzene
2,3-Dimethylphenol
o-Xylenol

CAS

526-75-0

Formula

C8H10O

Molecular Weight

122.18

EINECS

208-395-3

RTECS

ZE5500000

RTECS Class

Other

Merck

12,10215

Beilstein/Gmelin

1906267

Beilstein Reference

4-06-00-03096

EC Index Number

604-006-00-X

EC Class

Toxic; Corrosive; Dangerous for the Environment

Physical and Chemical Properties

Appearance

Colorless crystalline solid or brown chunky solid.

Solubility in water

Insoluble

Melting Point

75

Boiling Point

217

Vapor Pressure

0.093 (25 C)

Density

0.965 g/cm3 (20 C)

pKa/pKb

10.42 (pKa)

Partition Coefficient

2.4

Heat Of Vaporization

47.2 kJ/mol

Usage

Solvent, chemical intermediate (eg, for sulfur dyes), isomeric mixt is chemical intermediate for gasoline, lubricating oil and elastomer antioxidants.

Vapor Density

4.23

Odor threshold

0.5 mg/L (detection in water)

Refractive Index

1.5172 (74 C)

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

Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.

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. Wash clothing before reuse. Destroy contaminated shoes.

Eyes

Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Handling and Storage

Storage

Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Do not store in steel container.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale. Discard contaminated shoes.

Hazards Identification

Inhalation

Causes chemical burns to the respiratory tract. Aspiration may lead to pulmonary edema. May cause systemic effects.

Skin

Harmful if absorbed through the skin. Causes skin burns. May cause skin rash (in milder cases), and cold and clammy skin with cyanosis or pale color.

Eyes

Causes eye burns. May cause chemical conjunctivitis and corneal damage.

Ingestion

Harmful if swallowed. May cause severe and permanent damage to the digestive tract. Causes gastrointestinal tract burns. May cause perforation of the digestive tract. May cause systemic effects.

Hazards

When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.

EC Risk Phrase

R 24/25 34 51/53

EC Safety Phrase

S 26 36/37/39 45 61

UN (DOT)

2261

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

91

Autoignition

599

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, dry chemical, chemical foam, or alcohol-resistant foam. Use agent most appropriate to extinguish fire.

Upper exp. limit

6.4

Lower exp. limit

1.1

Fire Potential

This material is probably combustible.

Accidental Release Measures

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Incompatibilities

Bases, acid anhydrides, acid chlorides, oxidizing agents, steel, brass, copper, copper alloys.

Stability

Stable under normal temperatures and pressures.

Decomposition

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

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2261

Hazard Class

6.1

Packing Group

II