Product Identification

Product Name

Dimethyl sulfone

Synonyms

2,2,2-Trifluoroacetonitrile
Cyanotrifluoromethane
Methyl sulfone
Methylsulfonylmethane
Perfluoroacetonitrile
Sulfonylbismethane
Trifluoromethyl cyanide
Trifluoromethylcarbonitrile

CAS

353-85-5

CAS

67-71-0

Formula

C2F3N

Formula

C2H6O2S

Molecular Weight

94.13

Molecular Weight

95.02

EINECS

200-665-9

EINECS

206-542-6

RTECS

PB2785000

RTECS Class

Other

Merck

13,3284

Beilstein/Gmelin

1737717

Beilstein/Gmelin

1742942

Beilstein Reference

4-01-00-01279

Beilstein Reference

4-02-00-00472

Physical and Chemical Properties

Appearance

colorless gas

Appearance

White, crystalline powder.

Solubility in water

Soluble

Solubility in water

150 g/L

Melting Point

107 - 110

Boiling Point

238

Boiling Point

-64

Vapor Pressure

760 (238 C)

Vapor Pressure

16200 (25 C)

Density

1.1700 g/cm3 (110C)

pKa/pKb

28(at 25℃) (pKa)

Partition Coefficient

1.08

Heat Of Vaporization

18.7 kJ/mol

Usage

High temp solvent for many inorganic and organic substances.

Vapor Density

3.3

Refractive Index

1.4226 (20 C)

First Aid Measures

Ingestion

If swallowed, wash out mouth with water provided person is conscious. Call a physician.

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.

Ingestion

May be harmful if swallowed.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.

Inhalation

If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.

Inhalation

May be fatal if inhaled. Material may be irritating to mucous membranes and upper respiratory tract. Can cause rapid suffocation.

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.

Skin

In case of contact, immediately wash skin with soap and copious amounts of water.

Skin

May cause skin irritation. Skin contact may produce local frostbite, anesthesia and also may be irritating due to defatting action. May be harmful if absorbed through the skin.

Eyes

May cause eye irritation.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Eyes

In case of contact with eyes, flush with copious amounts of water for at least 15 minutes. Assure adequate flushing by separating the eyelids with fingers. Call a physician.

Handling and Storage

Storage

Keep tightly closed. Cylinder temperature should not exceed 125 F (52 C).

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 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

Ingestion

May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.

Inhalation

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

Skin

May cause skin irritation.

Eyes

May cause eye irritation.

Hazards

Emits toxic fumes under fire conditions.

EC Risk Phrase

26

EC Safety Phrase

38

EC Safety Phrase

S 22 24/25

UN (DOT)

1955

Exposure Controls/Personal Protection

Personal Protection

Compatible chemical-resistant gloves. Chemical safety goggles.

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

Government approved respirator in nonventilated areas and/or for exposure above the TLV or PEL.

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

Very toxic by inhalation. nonflammable high-pressure liquid and gas.

Fire Fighting Measures

Flash Point

143

Flash Point

-85

Fire Fighting

Extinguish using Use water spray or fog nozzle to keep cylinder cool. Move cylinder away from fire if there is no risk. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.

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

Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.

Small spills/leaks

Ventilate area and wash spill site after material pickup is complete.

Stability and Reactivity

Disposal Code

3

Stability

Stable at normal temperatures and pressures.

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents.

Decomposition

Carbon monoxide, Nitrogen oxides, Hydrogen fluoride, Hydrogen cyanide.

Decomposition

Carbon monoxide, oxides of sulfur, carbon dioxide.

Combustion Products

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

Transport Information

UN Number

1955

Hazard Class

2

HS Code

2930 90 70