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What are the boiling point and density of DMSO chemical?

Apr 21, 2026 Leave a message

CAS 67-68-5 Dimethyl sulfoxide (DMSO) is a solvent that is used in industry and in pharmaceuticals. It is known for being stable and for dissolving many substances. Two of its most important physical properties are its boiling point and density. These directly affect how easily it can be stored, handled, and applied.

 

Boiling Point of DMSO

The boiling point of dimethyl sulfoxide DMSO is: 189 °C (372 °F) at standard atmospheric pressure.

At standard atmospheric pressure (760 mmHg), the boiling point of pure DMSO is 189°C. This high boiling point gives DMSO excellent thermal stability, allowing it to remain a stable liquid in intermediate-temperature chemical reactions and preventing it from easily volatilizing.

 

Density of DMSO

The density of DMSO is 1.100 g/cm³ at 20℃.

DMSO chemical has a slightly higher density than water, and its density varies with temperature. The density of DMSO decreases slightly with increasing temperature. DMSO is completely miscible with water, ethanol, and most organic solvents; its density data is a crucial basis for calculating solution ratios in pharmaceutical and biochemical experiments.

 

Key Properties

Chemical Name DMSO/Dimethyl Sulfoxide/Methyl sulfoxide
Molecular Formula C₂H₆OS
Molecular Weight 78.13 g/mol
CAS Number 67-68-5
Appearance Colorless, transparent liquid
Odor Slight sulfur-like odor
Melting Point 18.5°C
Flash Point 87°C (Closed cup)
Refractive Index (20°C) 1.479
Viscosity (20°C) 1.99 mPa·s
Solubility Miscible with water and most organic solvents

 

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Applications of DMSO(CAS 67-68-5)

CAS 67-68-5 Dimethyl sulfoxide can be used as an organic solvent, a reaction medium, and an intermediate in organic synthesis. DMSO liquid can also be used as a dyeing solvent, a de-dyeing agent and a dyeing carrier for synthetic fibres. It can also be used to absorb acetylene and sulfur dioxide for recovery.

Dimethyl sulfoxide is a transparent liquid containing sulfur compounds. It is widely used in the petroleum, chemical, metallurgy, electronics, coatings, and polymer materials industries. Its potential applications and areas of development are very broad.

 

Dimethyl sulfoxide DMSO Organic Solvent

Safety & Handling

Hazard Classification: Flammable liquid (Class 3) under certain conditions

Health Effects:

  1. Skin contact may cause absorption and transport of dissolved substances
  2. Eye contact may cause irritation
  3. Inhalation of vapor or mist may cause discomfort

Precautions:

  1. Ensure good ventilation
  2. Wear solvent-resistant gloves, eye protection, and protective clothing
  3. Avoid ingestion and prolonged skin contact
  4. Fire & Explosion: Vapors can ignite; keep away from sparks, open flame, or heat
  5. Reactivity / Incompatibilities: Avoid contact with strong oxidizers, halogens, or reactive metals

 

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