Product Identification

Product Name

1,3-Dichloro-5,5-dimethylhydantoin

Synonyms

1,3-Dichloro-5,5-dimethyl-2,4-Imidazolidinedione
1,3-Dichloro-5,5-dimethylimidazolidine-2,4-dione
Dactin
Halane

CAS

118-52-5

Formula

C5H6Cl2N2O2

Molecular Weight

197.02

EINECS

204-258-7

RTECS

MU0700000

RTECS Class

Agricultural Chemical and Pesticide; Mutagen; Primary Irritant

Merck

13,3090

Beilstein/Gmelin

146013

Beilstein Reference

5-24-05-00373

EC Class

oxidizing, harmful, corrosive

Physical and Chemical Properties

Appearance

White solid powder, mild chlorine odor.

Solubility in water

2 g/L

Boiling Point

215

Vapor Pressure

0.15 (25 C)

Density

1.5 g/cm3 (20 C)

Partition Coefficient

1.36

Heat Of Vaporization

45.1 kJ/mol

Usage

Chlorinating agent, disinfectant, industrial deodorant, in water treatment, active ingredient of powder laundry bleaches.

Vapor Density

6.8

First Aid Measures

Ingestion

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

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 container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from moisture.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Do not allow contact with water. Keep from contact with moist air and steam.

Hazards Identification

Inhalation

Causes respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.

Skin

Causes skin irritation.

Eyes

Causes eye irritation.

Ingestion

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

Hazards

Combustion accompanied by evolution of chlorine @ 210 deg c.

EC Risk Phrase

R 22 34 41

EC Safety Phrase

S 26 36/37/39 45

UN (DOT)

3261

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 gloves to prevent skin exposure. Clothing: Wear appropriate 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

Rapid heart rate and rapid breathing are common. Severe exposure may cause cardiovascular collapse and respiratory arrest. Headache may develop. Agitation and anxiety may develop in patients with significant respiratory compromise. Chlorine (as hypochlorite) has been teratogenic in experimental animals. Mutations were detected using sperm morphology in mouse studies.

Exposure limit(s)

NIOSH REL: TWA 0.2 mg/m3 ST 0.4 mg/m3 OSHA PEL: TWA 0.2 mg/m3 IDLH 5 mg/m3

Poison Class

4

Fire Fighting Measures

Flash Point

84

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: Do NOT get water inside containers. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Fire Potential

This material is probably combustible.

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation. Do not get water inside containers.

Stability and Reactivity

Stability

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

Incompatibilities

Strong oxidizing agents, water.

Decomposition

Hydrogen chloride, nitrogen oxides, phosgene, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, nitrogen.

Transport Information

UN Number

3261

HS Code

2933 21 00