Molecular Weight

The molecular weight displayed the technical data section of our online product information pages represents the product as determined by its chemical structure. During the manufacturing process it is common for solvents, such as water and ethanol, to be incorporated into the product. The degree to which this occurs can vary from batch to batch and as a consequence the molecular weight of the material supplied can change. Batch molecular weight variations should not affect the basic pharmacological properties of the compound but will affect any concentration calculations carried out.

Solutions should only be made up using the batch specific molecular weight derived from:

  • the product vial label
  • the certificate of analysis (CoA) / product information sheet - available online

Further information can be found on our Vial Labels, SDS and CoA technical support pages.


Please complete a technical enquiry form if you don't find the answer you are looking for.

Alternatively, please contact us for further information and assistance.

View all Technical Support common questions.

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