A high-boiling polar aprotic solvent that dissolves a uniquely broad range of organic and inorganic species for synthesis and electronics processing. It is used as a reaction and polymerization solvent in organic and pharmaceutical synthesis, as a processing and stripping solvent in electronics and semiconductor manufacturing, as a paint stripper, and as a cryoprotectant in cell and tissue preservation.
▸Chemical synthesis: Reaction and polymerization solvent
▸Electronics: Processing and stripping solvent in semiconductor manufacture
▸Paint stripping: Active solvent in industrial paint removers
▸Cryopreservation: Cryoprotectant for cells and tissues
▸Extraction: Solvent for chemical extractions
Physical Properties
Physical Description
Dimethyl sulfoxide appears as a clear liquid, essentially odorless. Closed cup flash point 89 °C. Vapors are heavier than air. Contact with the skin may cause stinging and burning and lead to an odor of garlic on the breath. An excellent solvent that can transport toxic solutes through the skin. High vapor concentrations may cause headache, dizziness, and sedation
Appearance
Very hygroscopic liquid
Odor
Distinctive garlic or oyster-like odor
Taste
Slightly bitter taste with sweet after-taste
Boiling Point
189.00 to 190.00 °C. @ 760.00 mm Hg
Melting Point
18 °C
Flash Point
95 °C (95 °C) (Open cup)
Solubility
Soluble in ethanol, acetone, ether, carbon tetrachloride, ethyl acetate
Density
1.101 at 20 °C
Vapor Density
2.71
Vapor Pressure
Vapor pressure, Pa at 20 °C: 59.4
LogP
-1.35 (calculated)
Henry's Law Constant
Henry's Law constant = 1.031X10-8 atm-cu m/mol at 25 °C
Autoignition Temperature
215 °C
Viscosity
1.95 mm²/s at 20 °C
Heat Of Combustion
-10,890 Btu/lb = -6050 Cal/g
Heat of Vaporization
47.3 kJ/mol at 70 °C
Refractive Index
Index of refraction: 1.4783 at 20 °C/D
Dissociation Constants
pKa = 35.1
Safety & Handling
Full SDS available on request
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
HS / Tariff Classification
🌐Harmonized System (HS) Code — 6-digit international heading
2930.90
Chapter 29
Organic chemicals
Heading 29.30
Internationally harmonized (WCO HS)
Subheading 2930.90
6-digit international code — national tariff line adds further digits
Dimethyl sulfoxide (CAS 67-68-5), or DMSO, is a polar aprotic organosulfur solvent. It is used as a reaction and polymerization solvent in organic and pharmaceutical synthesis, as a processing and stripping solvent in electronics and semiconductor manufacturing, as a paint stripper, and as a cryoprotectant in cell and tissue preservation.
Frequently Asked Questions
What is dimethyl sulfoxide (DMSO) used for?
DMSO (CAS 67-68-5) is a polar aprotic organosulfur solvent. It is used as a reaction and polymerization solvent in organic and pharmaceutical synthesis, as a processing and stripping solvent in electronics and semiconductor manufacturing, as an industrial paint stripper, and as a cryoprotectant in cell and tissue preservation.
Is DMSO water soluble?
Yes. DMSO is a polar aprotic solvent that is miscible with water and with many organic solvents, which underpins its use as a reaction, processing, and extraction solvent. Refer to the SDS for full physical-property data.
What is the CAS number and formula of DMSO?
Dimethyl sulfoxide has CAS number 67-68-5 and molecular formula C2H6OS. Each bulk lot ships with a CoA referencing this CAS and an SDS.
How is bulk DMSO shipped under DOT?
DMSO is assigned UN 2811. Shipments must follow the classification and documentation on the SDS and current DOT/IMDG requirements; confirm packaging and labeling with your carrier and broker before transport.
What is the cost of bulk DMSO?
RawSource supplies DMSO in drums, totes, and IBCs to synthesis, electronics, and processing manufacturers. Pricing is quote-based on grade, volume, and packaging rather than a fixed list price; request a current bulk quote with your target quantity.
Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.
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