Dimethyl sulfoxid (DMSO) is a sulfur-containing organic compound with the formula (CH₃)₂SO. Appearance is a colorless transparent liquid or recrystallized below 18 ° C and is an aprotic polar solvent.

Dimethyl sulfoxid is an extremely important aprotic polar solvent that is both soluble in water and soluble in organic solvents. Widely used as a solvent and reagent, it has a high selectivity for extraction. Dimethyl sulfoxid itself has anti-inflammatory and analgesic effects, diuretic, sedative, etc., and can be directly used as a raw material and carrier for certain drugs in the pharmaceutical industry. It is known as the "all-purpose medicine" and is often added to the drug as an active ingredient of an analgesic drug. 
1. It is used for aromatic hydrocarbon extraction, reaction medium of resin and dye, acrylic fiber polymerization, solvent for spinning, etc. 
2. It can be used as organic solvent, reaction medium and organic synthesis intermediate. It is extremely versatile. This product has high selective extraction capacity, used as polymerization and condensation solvent for acrylic resin and polysulfone resin, polymerized spinning solvent for polyacrylonitrile and acetate fiber, extraction solvent for separation of alkane and aromatic hydrocarbon, Reaction medium for aromatics, butadiene extraction, acrylic spinning, plastic solvents and organic synthetic dyes, pharmaceuticals and other industries. In medicine, Dimethyl sulfoxid has anti-inflammatory and analgesic effects and has strong penetrating power on the skin, so it can dissolve certain drugs and make them penetrate into the body for therapeutic purposes. This carrier property of Dimethyl sulfoxid can also be used as an additive for pesticides. The addition of a small amount of Dimethyl sulfoxid to certain pesticides helps the penetration of pesticides into plants to improve the efficacy. Dimethyl sulfoxid can also be used as dyeing solvent, dyeing agent and dyeing carrier for synthetic fibers. It can also be used as absorbent for recovering acetylene and sulfur dioxide, synthetic fiber modifier, antifreeze and capacitor medium, brake oil and rare metal extractant. 
3, used as analytical reagents and gas chromatographic fixatives, also used as solvents in UV spectrometry
4. Transdermal enhancer. Dimethyl sulfoxid is one of the earliest transdermal penetration enhancers and its penetration properties may be related to its solvent properties. Dimethyl sulfoxid can denature proteins in skin keratinocytes; it can disrupt the orderly arrangement of lipids in the stratum corneum cells; it can remove the stratum corneum lipids and lipoproteins and enhance the penetration of drugs, but when using high concentration Dimethyl sulfoxid, it will It causes erythema, blisters and irreversible damage to the skin. It has been banned in the United States. The commonly used concentration is 30%-50%. 
5, antifreeze. The pure Dimethyl sulfoxid has a freezing point of 18.45 ° C, a 40 % aqueous Dimethyl sulfoxid - 60 ° C is not frozen, and Dimethyl sulfoxid is exothermic when mixed with water and snow. Therefore, it is convenient to make automobile antifreeze, brake oil and hydraulic fluid components. Ethylene glycol antifreeze is not suitable at temperatures below -40 °C, and it has a lower boiling point than Diesel sulfoxid, is toxic, and is prone to gas resistance. Dimethyl sulfoxid antifreeze is used in cars and tanks in the cold northern regions and can be replenished with snow water at any time. Dimethyl sulfoxid is also used in deicers, coatings, antifreeze for various latexes, antifreeze for gasoline and jet fuel, antifreeze for cryopreservation of bone marrow, blood and organs.