Dimethyl Sulfoxide (DMSO), CAS 67-68-5, is also known as methyl sulfoxide. It is a polar aprotic organosulfur solvent used in chemical processing and organic synthesis. For procurement review, confirm the intended industrial use, required assay and impurity limits, water content, and offered form, packaging, and applicable safety documentation.
Dimethyl Sulfoxide (DMSO) CAS 67-68-5
- CAS: 67-68-5
- Synonyms: Dimethyl sulfoxide; DMSO; Methyl sulfoxide; Dimethyl sulphoxide
- Einecs: 200-664-3
- Molecular Formula: C₂H₆OS
- Grade: Confirm current product specification
- Package: Confirm packaging for the offered form
Product Description
Product name: Dimethyl Sulfoxide (DMSO)
CAS number: 67-68-5
Molecular formula: C₂H₆OS
Molecular weight: 78.13 g/mol
EC number: 200-664-3
Other names: Dimethyl sulfoxide; DMSO; Methyl sulfoxide; Dimethyl sulphoxide
Chemical class: a polar aprotic organosulfur solvent
Identity check: DMSO is the established abbreviation for dimethyl sulfoxide.
Technical context: chemical processing and organic synthesis
RFQ information: Before an RFQ, confirm the intended industrial use, required assay and impurity limits, water content, and offered form.
Offered form: Not specified; confirm the actual offered form.
Specification review: Confirm identity, relevant assay or impurity criteria, and suitability in the current technical dossier.
FAQ - Technical & Supply Chain
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Q:
Are industrial, pharmaceutical and electronic grades of DMSO interchangeable?
A: No. The CAS number confirms chemical identity, not fitness for use. Pharmaceutical, electronic, synthesis and general industrial grades may differ in water, UV absorbance, trace metals, residue, acidity, bioburden controls and documentary standard. Qualify the offered grade against the actual process and destination-market requirements. -
Q:
Which specifications should be agreed when purchasing Dimethyl Sulfoxide?
A: Set the assay method and limits for water, color, acidity or alkalinity, residue after evaporation, refractive index, density and relevant trace impurities. Sensitive applications may also require UV absorbance, metals or specific compendial tests. Compare the batch COA with the agreed TDS rather than relying on a nominal purity alone. -
Q:
What should be considered for bulk DMSO storage and delivery?
A: DMSO is hygroscopic and freezes near room temperature, so agree a dry compatible tank or drum system, closure integrity, allowable water pickup and a controlled warming method if crystallization occurs. Confirm package size, transfer connections, seal records, production date, storage history and current SDS before unloading.
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