Dimethyl disulfide is an organic sulfur compound. It is one of the odor components of the white-stink fungus, and also one of the odor components emitted when milk deteriorates under light (a degradation product of methanethiol). Industrially, dimethyl disulfide is synthesized by the method of dimethyl sulfate.

• Purity & State: Dimethyl disulfide (dimethyl disulfide ether) industrial grade has a purity of ≥ 99%. It is a flammable yellow liquid with a smell of sulfur.
• Physical Constants: Melting point: -84.7°C, Boiling point: 109.6°C. Vapor pressure at 20°C is 3.0×10^6 mPa. KowlgP = 1.91. Henry constant is 105 Pa·m³/mol (calculated). Relative density at 20°C is 1.062. Solubility in water at 20°C is 2.7 g/L, and it is miscible with most organic solvents (15 - 25°C).
• Stability: It remains stable even when heated to 300°C. It is unstable when heated in the presence of oxidants. Freezing point is 16°C.
• Toxicity: GRAS (FEMA).
• Category & Hazards: Flammable Liquids. Easily ignited by fire, high temperature, or oxidants; decomposes into toxic sulfur dioxide gas upon contact with acids or high heat.

It is used as a solvent, a catalyst for oxidation, a pesticide intermediate, a coking inhibitor, etc.