Quick Answer: What Is the Purity of DMSO?
DMSO purity depends on the grade and application. Typical commercial grades include:
- Industrial grade: ≥99.0–99.5%
- Pharmaceutical grade: typically ≥99.9%, with additional requirements according to applicable USP, EP, JP or other standards
- Electronics/high-purity grade: typically ≥99.99%, with tighter controls on trace impurities
However, purity percentage alone does not determine whether a DMSO product is suitable for a particular application. Water content, color, metal ions, ionic impurities and other specification limits may also be important, especially for pharmaceutical, electronics and other high-purity applications.
What Is DMSO (CAS 67-68-5)?
Dimethyl sulfoxide, commonly abbreviated as DMSO, is an organosulfur compound with the molecular formula (CH₃)₂SO.
It is generally a colorless, transparent and hygroscopic liquid under suitable room-temperature conditions. DMSO has high polarity, a high boiling point, good thermal stability and is miscible with water. It can also dissolve a broad range of organic compounds.
DMSO is commonly described as a polar aprotic solvent because it can dissolve many polar and nonpolar substances without donating protons in the way that protic solvents such as alcohols do.
Its broad solvency has led to the informal description of DMSO as a "universal solvent." However, this is a general nickname rather than a literal scientific classification, since no single solvent dissolves every substance.
What Are the Different Purity Grades of DMSO?
DMSO is supplied in different grades because different industries have different requirements for purity and trace impurities.
1. Industrial-Grade DMSO
Typical purity: ≥99.0–99.5%
Industrial-grade DMSO is commonly used for applications where extremely low trace impurity levels are not required.
Typical applications include:
- General chemical synthesis
- Agrochemical formulation
- Industrial cleaning
- Chemical processing
- Selected polymer and manufacturing processes
For industrial applications, buyers generally focus on assay, appearance, water content, color and other agreed specification limits.
2. Pharmaceutical-Grade DMSO
Typical purity: ≥99.9%
Pharmaceutical applications require more than a high assay value. The material may also need to comply with a specific pharmacopeial or customer specification, such as USP, EP or JP, depending on the intended use and market.
Pharmaceutical-grade DMSO can be used in areas such as:
- Pharmaceutical manufacturing
- API-related processes
- Pharmaceutical intermediates
- Selected topical formulations
- Other controlled pharmaceutical applications
For pharmaceutical procurement, buyers should confirm the applicable standard and impurity requirements rather than selecting a product based only on the stated percentage purity.
3. Electronics and High-Purity DMSO
Typical purity: ≥99.99%
High-purity DMSO is intended for applications where trace contaminants can affect process performance or product quality.
Potential applications include:
- Precision electronic-component cleaning
- High-purity chemical processing
- Selected advanced-material applications
- Specialized battery and energy-related processes
For electronics and other high-purity applications, trace metals, water content, ionic impurities and other contaminants may be as important as the overall assay.
Therefore, a 99.99% product is not automatically suitable for every electronics application. The buyer should compare the complete specification with the requirements of the process.
Is Higher-Purity DMSO Always Better?
Not necessarily. The highest-purity DMSO is not automatically the best choice for every application. The appropriate grade should be determined by the process requirements.
For example:
- A general industrial cleaning process may only require ≥99.0–99.5% DMSO.
- A pharmaceutical process may require ≥99.9% DMSO plus compliance with a specific pharmacopeial standard.
- A sensitive electronics application may require ≥99.99% DMSO and strict limits for trace metals, water and ionic impurities.
Choosing a grade that is unnecessarily high in purity can increase procurement costs without providing a meaningful benefit to the process.
The better approach is to match the complete specification to the intended application.
Is dimethyl sulfoxide (DMSO) a solvent?
Dimethyl sulfoxide is a highly versatile solvent. It is a polar aprotic solvent, this unique property allows it to dissolve a wide range of substances, it is widely used in chemical synthesis, pharmaceutical formulation, and industrial processes as a solvent due to its excellent dissolving power.
How to Choose the Right DMSO Grade?
Selecting based only on the purity number can lead to an unsuitable product. Buyers should consider the complete specification.
1. Confirm the Required Purity
First determine whether the application requires: ≥99.0%, ≥99.5%, ≥99.9%, ≥99.99%
The required level should be based on the process rather than simply choosing the highest available purity.
2. Check Water Content
DMSO is hygroscopic, so water content can be an important specification.
For moisture-sensitive processes, the buyer should confirm the maximum water content specified for the product.
3. Check Trace Impurities
For pharmaceutical, electronics and other sensitive applications, additional parameters may include:
- Trace metals
- Ionic impurities
- Residual solvents
- Color
- Specific organic impurities
These parameters can be more important than the assay alone.
4. Confirm Applicable Standards
Pharmaceutical buyers should confirm whether the material needs to meet USP, EP, JP or another applicable specification.
Electronics and high-purity users should confirm their own limits for metals, ions, water and other contaminants.
5. Request Batch Documentation
For B2B procurement, buyers may request:
- Certificate of Analysis (COA)
- Safety Data Sheet (SDS/MSDS)
- Technical Data Sheet (TDS)
- Applicable compliance documentation
The documents should correspond to the actual product grade and batch being supplied.
Need Dimethyl Sulfoxide CAS 67-68-5 for Bulk Applications?
GNEE BIO supplies Dimethyl Sulfoxide (DMSO), CAS 67-68-5, for industrial and commercial applications with different purity and specification requirements.
For bulk procurement, buyers can confirm the required purity, grade, water content, packaging, COA, SDS and other specification requirements before placing an order.
If you are sourcing DMSO for chemical synthesis, agrochemical, pharmaceutical, cleaning or other industrial applications, contact GNEE BIO to discuss your required specification and request a quotation.
