Is CAS 67-68-5 DMSO liquid flammable or combustible?

CAS No.: 67-68-5
Synonyms / IUPAC Name: Dimethyl sulfoxide, methanesulfinylmethane
Molecular Formula: C₂H₆OS
Molecular Weight: 78.13 g/mol

Physicochemical Properties (Typical)

Appearance: Colorless liquid

Odor: Slightly sulfur-like or garlicish on skin contact

Melting / Freezing Point: 18.5°C

Boiling Point: 189 °C

Density (20 °C): ~1.10 g/cm³

Refractive Index (n²⁰ᴰ): ~1.479

Solubility: Fully miscible with water and most organic solvents

Viscosity: ~2.2 cP at 20 °C

Vapor Pressure (20 °C): ~0.6 Torr (~0.8 mmHg)

Dielectric Constant: ~46.7 (20 °C)

Stability: Stable under normal handling; hygroscopic and can absorb water

Is DMSO liquid flammable or combustible?

Dimethyl sulfoxide (DMSO, CAS 67-68-5) is generally classified as a combustible liquid, not a highly flammable one.

Flammability Classification

Dimethyl sulfoxide (DMSO) has a closed-cup flash point of approximately 87 °C and a boiling point of 189 °C. It is classified as a flammable liquid, with a low fire hazard under normal storage and handling conditions.

DMSO is not easily ignited at room temperature. A relatively high ambient temperature is required to produce sufficient vapor for combustion. Compared to common solvents such as acetone and ethanol, DMSO is much less flammable.

Fire Hazard Conditions

• DMSO liquid may pose a fire hazard under the following conditions:
• Heating to temperatures exceeding its flash point
• Contact with open flames and strong ignition sources
• Mixing with strong oxidizers

Safety Precautions

Dimethyl sulfoxide (DMSO) should be stored away from heat, sparks, and open flames. All handling should be performed in a well-ventilated area, and the container should always be kept sealed. All applicable standard chemical handling procedures must be strictly followed.

Dimethyl sulfoxide DMSO Organic Solvent

Main Applications of Dimethyl Sulfoxide CAS 67-68-5 (DMSO)

Pharmaceuticals: DMSO solvent is used as a drug solvent and delivery aid for certain medical applications, such as interstitial cystitis.

Chemical Industry: Used as a strong solvent in reactions and synthesis.

Laboratory Uses: Cell culture and analytical testing.

Cryopreservation: Protects cells (stem cells, blood, embryos) during freezing.

Industrial Uses: Industrial DMSO is used for electronics cleaning and polymer processing.

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