Product Identification

Product Name

Methylbenzene

Synonyms

Methylbenzene
Phenyl methane
Toluol

CAS

108-88-3

Formula

C7H8

Molecular Weight

92.14

EINECS

203-625-9

RTECS

XS5250000

RTECS Class

Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant

Merck

12,9667

Beilstein/Gmelin

635760

Beilstein Reference

4-05-00-00766

EC Index Number

601-021-00-3

EC Class

Highly flammable; Harmful

Physical and Chemical Properties

Appearance

Clear, colorless liquid with a benzene-like odor.

Solubility in water

0.5 g/L (20 C)

Melting Point

-95

Boiling Point

110.6

Vapor Pressure

22 (20 C)

Density

0.867 g/cm3 (20 C)

pKa/pKb

40(at 25℃) (pKa)

Partition Coefficient

2.73

Heat Of Vaporization

38.01 kj/mol

Heat Of Combustion

-3910.3 kJ/mol

Usage

In the manufacture of benzoic acid, benzaldehyde, explosives, dyes, and many other organic compounds, as a solvent for paints, lacquers, gums, resins, in the extraction of various principles from plants, as gasoline additive.

Saturation Concentration

2.9% (20 C)

Vapor Density

3.14

Odor threshold

2.14 ppm

Refractive Index

1.4967 (20 C)

First Aid Measures

Ingestion

Aspiration hazard. If swallowed, DO NOT INDUCE VOMITING. Give large quantities of water. Never give anything by mouth to an unconscious person. Get medical attention immediately. If vomiting occurs, keep head below hips to prevent aspiration into lungs.

Inhalation

Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. Get medical aid. 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

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

Eyes

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

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. Avoid contact with eyes, skin, and clothing. Avoid contact with skin and eyes. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.

Hazards Identification

Inhalation

Inhalation may cause irritation of the upper respiratory tract. Symptoms of overexposure may include fatigue, confusion, headache, dizziness and drowsiness. Peculiar skin sensations (e. g. pins and needles) or numbness may be produced. Very high concentrations may cause unconsciousness and death.

Skin

Causes irritation. May be absorbed through skin.

Eyes

Causes severe eye irritation with redness and pain.

Ingestion

Swallowing may cause abdominal spasms and other symptoms that parallel over-exposure from inhalation. Aspiration of material into the lungs can cause chemical pneumonitis, which may be fatal.

Hazards

Dangerous fire hazard when exposed to heat or flame. Vapors can flow along surfaces to distant ignition source and flash back.

EC Risk Phrase

R 11 20

EC Safety Phrase

S 16 25 29 33

UN (DOT)

1294

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 half-face organic vapor respirator may be worn for up to ten times the exposure limit, or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. A full-face piece organic vapor respirator may be worn up to 50 times the exposure limit, or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. For emergencies or instances where the exposure levels are not known, use a full-face piece positive-pressure, air-supplied respirator.

Exposure Effects

Reports of chronic poisoning describe anemia, decreased blood cell count and bone marrow hypoplasia. Liver and kidney damage may occur. Repeated or prolonged contact has a defatting action, causing drying, redness, dermatitis. Exposure to toluene may affect the developing fetus.

Exposure limit(s)

OSHA PEL: TWA 200 ppm C 300 ppm 500 ppm (10-minute maximum peak) NIOSH REL: TWA 100 ppm (375 mg/m3) ST 150 ppm (560 mg/m3) NIOSH IDLH: 500 ppm

Poison Class

4

Fire Fighting Measures

Flash Point

7

Autoignition

422

Fire Fighting

Wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full facepiece operated in the pressure demand or other positive pressure mode. Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use foam, dry chemical, or carbon dioxide.

Upper exp. limit

819

Lower exp. limit

3.3

Fire Potential

Flammable liquid and vapor.

Accidental Release Measures

Small spills/leaks

Avoid runoff into storm sewers and ditches which lead to waterways. Use water spray to disperse the gas/vapor. Remove all sources of ignition. Absorb spill using an absorbent, non-combustible material such as earth, sand, or vermiculite. Provide ventilation. A vapor suppressing foam may be used to reduce vapors. Use water spray to reduce vapors, do not put water directly on leak, spill area or inside container.

Stability and Reactivity

Disposal Code

1

Incompatibilities

Acids (mineral, oxidizing, e.g. chromic acid, hypochlorous acid, nitric acid, sulfuric acid), oxidizing agents (strong, e.g. bromine, hydrogen peroxide, nitrogen dioxide, potassium nitrate), water reactive substances (e.g. acetic anyhdride, alkyl aluminum chloride, calcium carbide, ethyl dichlorosilane).

Stability

Stable under ordinary conditions of use and storage. Containers may burst when heated.

Decomposition

Carbon monoxide, carbon dioxide.

Combustion Products

Moderately dangerous; when heated, emits toxic fumes which can react vigorously with oxidizing materials.

Transport Information

UN Number

1294

Hazard Class

3

Packing Group

II

HS Code

2902 30 00