Dimethyl sulfoxide (DMSO) is a highly polar, aprotic solvent valued for its powerful solvency, low toxicity and miscibility with water and most organic solvents. But not all DMSO is the same — choosing the wrong grade can affect product quality, regulatory acceptance and even safety.
The three standard DMSO grades
1. Electronic grade (Type I, purity ≥ 99.98%)
The cleanest grade, with tightly controlled metal ions, particulates and moisture. It is used in semiconductor cleaning, electronic-component manufacturing and other processes where trace contamination is unacceptable.
2. Pharmaceutical grade (Type II, purity ≥ 99.96%)
Manufactured under stricter process control for API synthesis, drug-delivery systems and biotech applications where consistent purity and documentation (COA, traceability) are required.
3. Industrial grade (Type III, purity ≥ 99.90%)
A cost-effective grade for polymer and carbon-fiber production, fine-chemical synthesis, extraction and general industrial applications that do not require electronic-level cleanliness.
How to choose the right grade
- Semiconductor / electronics: always specify electronic grade and agree on metal-ion and particle limits.
- Pharma / biotech: use pharmaceutical grade and request batch COAs.
- Polymers, carbon fiber, general synthesis: industrial grade usually offers the best value.
Why grade separation matters
Cross-contamination between grades is a common hidden risk. Reputable suppliers run dedicated or thoroughly cleaned lines, test every batch and provide clear specifications. At Yujichem, our three DMSO grades follow GB/T 21395-2024 and are kept strictly separate from synthesis through packaging.
Not sure which grade fits your process? Tell us your application and required purity — our technical team will recommend the right grade and send a current datasheet and quotation within 24 hours. Contact us here.