The relatively high freezing point of DMSO (18.6°C, 65.6°F) can complicate handling operations, such as removal of DMSO from drums. This is a natural property of DMSO, and the product can be frozen and thawed without any changes in product quality.
If possible, store and handle DMSO drums and containers above 20°C to avoid freezing.
When DMSO freezes and thaws, purity of the material is unaffected.
DMSO can be safely thawed for use - using simple methods.
Freezing Point Depression Agents: The best freezing point depressant for use with DMSO is water, (the freezing point of a DMSO mixture containing 8 wt% water will freeze at 0°C). Other hydroxylic cosolvents (methanol, glycerin, PG) have a more modest effect, and levels of about 30 wt% can depress freezing to under 0°C. Most other solvents are not effective as freezing point depression agents; ask a technical question for formulation-specific information. Gaylord offers DMSO Industrial LFP grade which contains 8% water to resist freezing. If your application is not sensitive to water content, please contact us to discuss this product.
Don't confuse DMS (Dimethyl sulfide) containers with those containing DMSO (dimethyl sulfoxide). DMS has a low freezing point and should not be heated due to its high vapor pressure and flammability.
Related Resources
GCC Freeze / Thaw Stability statement
