CAS 67-68-5: DMSO (Dimethyl Sulfoxide) (C2H6OS)

Identity

CAS Number67-68-5
Molecular FormulaC2H6OS
IUPAC Namemethanesulfinylmethane
Molecular Weight78.13 g/mol
SMILESCS(=O)C
Synonymsdimethyl sulfoxide, methyl sulfoxide, DMSO, DMSO 99.9%

2D Structure

Physical Properties

Density1.1 g/mL at 25°C
Boiling Point189.0°C
Melting Point18.5°C
Flash Point95°C
Vapor Pressure0.06 kPa at 20°C
Refractive IndexnD = 1.479
Dielectric Constantε = 46.7

Safety & GHS Classification

Irritant

Storage: Store in tightly sealed containers. Hygroscopic — DMSO absorbs water rapidly. Keep away from strong oxidizers and halogens. DMSO penetrates skin and carries dissolved chemicals — handle with gloves. Do not store near ignition sources despite high flash point.

Material Compatibility Matrix

Plastics

MaterialRating
PTFEExcellent
PVCFair
PEGood
PPGood
PEEKExcellent
PVDFGood

Rubbers

MaterialRating
VitonGood
NBRGood
EPDMExcellent
SiliconeGood
FKMGood

Metals

MaterialRating
Stainless 316Excellent
AluminumExcellent
CopperExcellent
BrassExcellent

Applications

External References: PubChem

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