Product Identification

Product Name

3-Methylpyrazole

Synonyms

3-Methyl-1H-pyrazole
5-Methylpyrazole

CAS

1453-58-3

Formula

C4H6N2

Molecular Weight

82.11

EINECS

215-925-7

RTECS

UQ7340000

RTECS Class

Drug; Reproductive Effector

Beilstein/Gmelin

1454

Beilstein Reference

5-23-05-00004

EC Class

harmful, irritant

Physical and Chemical Properties

Appearance

Clear very light yellow liquid.

Solubility in water

Soluble

Melting Point

36 - 37

Boiling Point

204

Vapor Pressure

0.39 (25 C)

Density

1.0227 g/cm3 (14 C)

pKa/pKb

10.45 (pKb)

Partition Coefficient

.78

Heat Of Vaporization

42.2 kJ/mol

Vapor Density

2.83

Refractive Index

1.4904 (13.7 C)

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Get medical aid immediately. 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.

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 immediately.

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. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale. Use only in a chemical fume hood. Wash clothing before reuse. Do not breathe vapors.

Hazards Identification

Inhalation

May cause respiratory tract irritation. Aspiration may lead to pulmonary edema. Harmful if inhaled.

Skin

Causes skin irritation.

Eyes

Causes eye irritation. May cause chemical conjunctivitis.

Ingestion

May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed.

EC Risk Phrase

R 22 36/38

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 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

87

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.

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Cover with sand, dry lime or soda ash and place in a closed container for disposal. Provide ventilation.

Stability and Reactivity

Disposal Code

5

Stability

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

Incompatibilities

Strong oxidizing agents.

Decomposition

Nitrogen oxides, carbon monoxide, carbon dioxide.

Transport Information

HS Code

2933 19 90