Dimethyl Sulfoxide 99.9% (DMSO)

Dimethyl Sulfoxide 99.9% (DMSO) (CAS 67-68-5, molecular formula C2H6OS) is a process chemical for electronics and metal finishing, where trace metal content and particle contamination matter as much as headline assay. China Chemicals supplies it at 99.9% min in pack sizes from 1 L through to 200 L Drum, so laboratory trial quantities and full production volumes can be sourced from the same specification.

It is also traded as DMSO, Methylsulfinylmethane, Sulfinylbismethane. Every consignment ships with a batch-specific Certificate of Analysis and the current Safety Data Sheet, and material is stored and picked under stock rotation so you receive product well inside its shelf life.

Typical applications

Photoresist and polyimide stripping
Reaction solvent in fine chemical synthesis
Spinning solvent for acrylic and polysulphone fibre
Cryoprotectant in cell preservation at pharma grade
Paint stripper component in low-VOC systems

Technical specification

Chemical name	Dimethyl Sulfoxide 99.9% (DMSO)
Synonyms	DMSO, Methylsulfinylmethane, Sulfinylbismethane
CAS number	67-68-5
Molecular formula	C2H6OS
Appearance	Clear colourless hygroscopic liquid
Purity	99.9% min
Water	0.05% max
Acidity as H2SO4	0.003% max
Colour (APHA)	20 max
Density at 20°C	1.100 – 1.104 g/cm³
Freezing point	18.4°C

Values above are typical and are confirmed on the Certificate of Analysis issued against each batch. Tighter specifications can be quoted where a process requires them.

Packaging and supply

Available in 1 L, 5 L, 25 L, 200 L Drum. Bulk, road tanker and export drum quantities are quoted on request, including FOB and CIF terms for international shipment. Pricing shown is per pack in USD, exclusive of freight and any applicable duties.

Handling and safety

Transport classification: Not regulated · Not classified as hazardous. Store in the original closed container in a cool, well-ventilated area away from incompatible materials, and handle using appropriate personal protective equipment. Read the Safety Data Sheet in full before use — it is issued with every order and is available on request before purchase.

Supply to industry only. Products are sold for legitimate industrial, laboratory and manufacturing use. We may request end-use details and business registration before releasing an order.