Product Identification

Product Name

1,3,5-Trimethylbenzene

Synonyms

Mesitylene

CAS

108-67-8

Formula

C9H12

Molecular Weight

120.2

EINECS

203-604-4

RTECS

OX6825000

RTECS Class

Mutagen; Human Data; Primary Irritant

Merck

13,5934

Beilstein/Gmelin

906806

Beilstein Reference

4.05-00-01016

EC Index Number

601-025-00-5

EC Class

Flammable; Irritant; Dangerous for the Environment

Physical and Chemical Properties

Appearance

Clear, colorless liquid with distinctive aromatic odor.

Solubility in water

20 mg/L

Melting Point

-45

Boiling Point

165

Vapor Pressure

2.3 (25 C)

Density

0.8637 g/cm3 (20 C)

Partition Coefficient

3.6

Heat Of Vaporization

47.7 kJ/mol

Heat Of Combustion

-5241 kJ/mol

Usage

Dyestuff intermediate, solvent, paintermediate thinner.

Saturation Concentration

l.0% at 20 C; 0.24% at 20 C (calculated)

Vapor Density

4.1

Refractive Index

1.49541 (20 C)

First Aid Measures

Ingestion

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.

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 if irritation develops or persists. Wash clothing before reuse. Flush skin with plenty of soap and water.

Eyes

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

Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.

Handling

Wash thoroughly after handling. Use only in a well ventilated area. Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.

Hazards Identification

Inhalation

Causes respiratory tract irritation. May cause anemia. May cause drowsiness, unconsciousness, and central nervous system depression. Vapors may cause dizziness or suffocation. May cause asthma-like symptoms and sleepiness.

Skin

May cause skin irritation. Excessive drying of the skin may result form repeated or prolonged contact.

Eyes

Causes eye irritation.

Ingestion

May cause irritation of the digestive tract.

Hazards

Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

EC Risk Phrase

R 10 37 51/53

EC Safety Phrase

S 61

UN (DOT)

2325

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

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.

Exposure Effects

Prolonged or repeated skin contact may cause irritation. Chronic inhalation may cause effects similar to those of acute inhalation.

Exposure limit(s)

TLV: 25 ppm; 125 mg/m3 (ACGIH 1993-1994). NIOSH REL: TWA 25 ppm (125 mg/m3)

Poison Class

4

Fire Fighting Measures

Flash Point

44

Autoignition

560

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Can release vapors that form explosive mixtures at temperatures above the flashpoint. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Water may be ineffective. Do NOT use straight streams of water.

Upper exp. limit

6

Lower exp. limit

1

Fire Potential

HIGHLY FLAMMABLE.

Accidental Release Measures

Small spills/leaks

Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. Use a spark-proof tool. Provide ventilation. A vapor suppressing foam may be used to reduce vapors.

Stability and Reactivity

Disposal Code

1

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents.

Decomposition

Carbon monoxide, carbon dioxide.

Combustion Products

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

Transport Information

UN Number

2325

Hazard Class

3

Packing Group

III

HS Code

2902 90 80