Product Identification
【Product Name】Methanesulfonic anhydride
【Synonyms】Mesyl anhydride；甲基磺酸酐
【CAS】7143-01-3
【Formula】C2H6O5S2
【Molecular Weight】174.2
【EINECS】230-442-1
【Beilstein/Gmelin】972316
【Beilstein Reference】4-04-00-00028
【EC Class】corrosive

Physical and Chemical Properties
【Solubility in water】Very soluble
【Melting Point】63~66℃
【Boiling Point】289℃
【Vapor Pressure】0.004 (25℃)
【Partition Coefficient】-.93
【Heat Of Vaporization】50.7 kJ/mol
【Usage】May be used to generate mesylates.

First Aid Measures
【Ingestion】Seek medical assistance.
【Inhalation】Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
【Skin】Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
【Eyes】Immediately flush with running water for at least 20 minutes.

Hazards Identification
【Ingestion】See Inhalation.
【Inhalation】TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Effects of contact or inhalation may be delayed.
【Skin】Contact with molten substance may cause severe burns to skin and eyes. See Inhalation.
【Eyes】See Inhalation.
【Hazards】Contact with metals may evolve flammable hydrogen gas.
【EC Risk Phrase】R 14 35
【EC Safety Phrase】S 26 36/37/39 45
【UN (DOT)】2586

Exposure Controls/Personal Protection
【Personal Protection】Wear appropriate protective gloves, clothing and goggles.
【Respirators】Wear positive pressure self-contained breathing apparatus (SCBA).

Fire Fighting Measures
【Flash Point】129℃
【Fire Fighting】Small Fires: Dry chemical, carbon dioxide or water spray. Large Fires: Dry chemical, carbon dioxide, alcohol-resistant foam or water spray.
【Fire Potential】Combustible material: may burn but does not ignite readily.

Accidental Release Measures
【Small spills/leaks】ELIMINATE all ignition sources. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.

Stability and Reactivity
【Disposal Code】4
【Combustion Products】Fire may produce irritating, corrosive and/or toxic gases.

Transport Information
【UN Number】2586
【HS Code】2904 10 00