CAS 75-75-2: Methanesulfonic Acid (CH4O3S)

Identity

CAS Number75-75-2
Molecular FormulaCH4O3S
IUPAC Namemethanesulfonic acid
Molecular Weight96.11 g/mol
SMILESCS(=O)(=O)O
SynonymsMSA, methanesulfonic acid, methylsulfonic acid, mesylic acid

2D Structure

Physical Properties

Density1.481 g/mL at 25°C
Boiling Point167.0°C
Melting Point20.0°C
Flash Point110.0°C
Vapor Pressure0.1 kPa at 20°C
Refractive IndexnD = 1.429
Dielectric Constantε = 34.0

Safety & GHS Classification

GHS05Irritant

Storage: Store in corrosion-resistant containers (glass or PTFE). Solidifies below 20°C — warm gently to re-melt. Keep away from strong bases, metals, and oxidizers. Use in fume hood with acid-resistant PPE.

Material Compatibility Matrix

Plastics

MaterialRating
PTFEExcellent
PVCExcellent
PEExcellent
PPExcellent
PEEKExcellent
PVDFExcellent

Rubbers

MaterialRating
VitonExcellent
NBRGood
EPDMExcellent
SiliconeGood
FKMExcellent

Metals

MaterialRating
Stainless 316Excellent
AluminumGood
CopperFair
BrassFair

Applications

External References: PubChem

Related Chemicals

CAS 110-82-7

Cyclohexane (C6H12)

hexamethylene, hexanaphthene

CAS 75-09-2

Dichloromethane (Methylene Chloride) (CH2Cl2)

methylene chloride, DCM

CAS 109-99-9

Tetrahydrofuran (THF) (C4H8O)

THF, oxolane