Product Identification

Product Name

Carbonothioic dihydrazide

Synonyms

1,3-Diamino-2-thiourea
Carbonothioic dihydrazide
Thiocarbazide
Thiocarbonic dihydrazide
Thiocarbonohydrazide

CAS

2231-57-4

Formula

CH6N4S

Molecular Weight

106.17

EINECS

218-769-8

RTECS

FF2975000

RTECS Class

Agricultural Chemical and Pesticide; Primary Irritant

Beilstein/Gmelin

506657

Beilstein Reference

4-03-00-00388

Physical and Chemical Properties

Appearance

Crystalline needles and plates.

Solubility in water

Very soluble

Boiling Point

230

Vapor Pressure

0.07 (25 C)

pKa/pKb

11.99 (pKb)

Partition Coefficient

-1.33

Heat Of Vaporization

46.7 kJ/mol

Usage

Thiocarbohydrazide is used in electron microscopy to produce electron-opaque deposits for ultrastructural analysis.

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. Remove contaminated clothing and shoes.

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. 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.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. May form flammable dust-air mixtures. 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. Do not ingest or inhale. Avoid mechanical shock and friction. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.

Hazards Identification

Ingestion

May be fatal if swallowed. The toxicological properties of this substance have not been fully investigated. May cause central nervous system effects.

Inhalation

Inhalation of dust may cause respiratory tract irritation.

Skin

May cause skin irritation. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material.

Eyes

Dust may cause mechanical irritation.

Hazards

When heated to decomposition it emits very toxic fumes of nitrogen oxides and sulfur oxides.

EC Risk Phrase

R 5 26/28 21

EC Safety Phrase

S 15 28 36/37/39 45

UN (DOT)

2811

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.

Fire Fighting Measures

Flash Point

93

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Flammable solid. Material is shock sensitive and potentially explosive. Greatly increases the burning rate of combustible materials. Extinguishing media: Use water spray, dry chemical, or carbon dioxide.

Fire Potential

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation.

Stability and Reactivity

Incompatibilities

Strong oxidizing agents, strong acids.

Stability

Substance is shock sensitive and thermally unstable.

Decomposition

Carbon monoxide, oxides of nitrogen, oxides of sulfur, carbon dioxide.

Combustion Products

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

Transport Information

UN Number

2811

Hazard Class

6.1

Packing Group

I; II; III