Methanesulfonyl fluoride

  • Fluoro methyl sulfone
  • Methylsulfonyl fluoride
  • Fumette
  • Mesyl fluoride
  • MSF
Formula
CH3FO2S
Structure
Description
Clear, colorless liquid
Uses
Fumigant insecticide.

Registry Numbers and Inventories.
CAS
558-25-8
EC (EINECS/ELINCS)
209-192-2
R 26/27/28 34
S 26 28 36/37/39 45
RTECS
PB2975000
RTECS class
Agricultural Chemical and Pesticide
UN (DOT)
2927
Beilstein/Gmelin
1511
Beilstein Reference
5-17-09-00288
Swiss Giftliste 1
G-2406
Canada DSL/NDSL
NDSL
US TSCA
Listed

Properties.
Formula
CH3FO2S
Formula mass
98.10
Boiling point, °C
123
Vapor pressure, mmHg
16 (25 C)
Density
1.20006 g/cm3 (19.5 C)
Solubility in water
Soluble
Refractive index
1.5214 (22 C)
Partition coefficient, pKow
0.55
Heat of vaporization
34.7 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container. Keep under a nitrogen blanket.
Handling
Wash thoroughly after handling. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Use only in a chemical fume hood.
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.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Wash area with soap and water. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong bases, oxidizing agents, alcohols.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen fluoride, fluoride fumes.

Fire.
Flash Point,°C
28
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. Water Reactive. Material will react with water and may release a flammable and/or toxic gas. Extinguishing media: Use carbon dioxide or dry chemical. DO NOT USE WATER!
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
When heated to decomposition, it emits very toxic fumes of fluorides and sulfur oxides.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
1
Exposure effects
Hyperventilation, low heart rate, rapid heart rate, elevated blood pressure, or abnormally low blood pressure may be seen. Symptoms noted in experimental animals included CNS depression, tremors, ataxia, and convulsions. Anticholinesterase compounds can affect the central nervous system, producing restlessness, anxiety, headaches, convulsions, and coma. No data were available to assess the teratogenic potential of this agent. <br>No data were available to assess the potential effects of exposure to this agent during pregnancy or lactation. <br>No information about possible male reproductive effects was found in available references.
   Ingestion
May be fatal if swallowed. Causes gastrointestinal tract burns.
   Inhalation
May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
   Skin
Causes skin burns.
   Eyes
Causes eye burns. Lachrymator.

First aid
 
   Ingestion
Do NOT induce vomiting. 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
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Destroy contaminated shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
2927
Response guide
Hazard class
6.1
Packing Group
I; II
 
USCG CHRIS Code
MFD