Product Identification

Product Name

1H-Pyrazole

Synonyms

1,2-Diazole

CAS

288-13-1

Formula

C3H4N2

Molecular Weight

68.08

EINECS

206-017-1

RTECS

UQ4900000

RTECS Class

Reproductive Effector

Merck

12,8144

Beilstein/Gmelin

103775

Beilstein Reference

5-23-04-00122

EC Class

harmful, irritant

Physical and Chemical Properties

Appearance

Colorless crystals.

Solubility in water

Very soluble

Melting Point

66 - 68

Boiling Point

186

Vapor Pressure

0.89 (25 C)

Density

1.026 - 0.952 g/cm3 (70 - 155 C)

pKa/pKb

11.53 (pKb)

Partition Coefficient

.32

Heat Of Vaporization

40.6 kJ/mol

Heat Of Combustion

-1858 kJ/mol

Usage

Chelating agent.

Refractive Index

1.4203 (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 immediately.

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

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. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.

Hazards Identification

Inhalation

Inhalation of dust may cause respiratory tract irritation.

Skin

May cause skin irritation.

Eyes

May cause eye irritation.

Ingestion

May be harmful if swallowed.

Hazards

During a fire, irritating and highly toxic gasesmay be generated by thermal decomposition or combustion.

EC Risk Phrase

R 22 36/37/38

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

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

May cause reproductive and fetal effects.

Fire Fighting Measures

Flash Point

88

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. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Accidental Release Measures

Small spills/leaks

Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Disposal Code

3

Incompatibilities

Oxidizing agents, acids.

Stability

Stable under normal temperatures and pressures.

Decomposition

Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.

Transport Information

HS Code

2933 19 90