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Melting Point Certified Reference Standards
Application Note #2

What is a Certified Reference Standard?
Certified Reference Standards (CRSs) are high-purity chemicals certified by
national, local or international standards laboratories and pharmacopeias, which
are produced and tested according to well established and easy-to-reproduce
procedures.

Use CRSs for temperature scale calibration and determination of acceptability of
melting point (MP) instruments including OptiMelt.

General Guidelines and Recommendations

 Use CRSs obtained from reputable standards and pharmacopeia
 Laboratories.

 Use CRSs with certificates of measurement including records of:

      (1) Lot/batch Identification number (for traceability)
      (2) Purity specification (analysis method, purity levels, etc.)
      (3) Detailed description of the instrumental setup used for the melting
          point determination (i.e. type of instrument, manual or automatic
          detection, hot bath or metal block oven, capillary tube dimensions,
          amount/height of sample packed, compaction method, etc.)
      (4) Preconditioning of the sample (i.e. drying, grinding, etc).
      (5) Detailed heating conditions, including initial temperature, ramping rate
          and any special comments required to properly reproduce the melting
          conditions used by the standards laboratory to certify the compound.
          Alternatively, a reference to a standardized MP determination method
          must be included.
      (6) Melting points and melting point ranges with well characterized
          uncertainty errors.

 Whenever possible, choose the CRSs with the smallest uncertainty errors.
 Remember that the accuracy of your OptiMelt is only as good as the accuracy
 of the standards used for its calibration. Note: As a general rule, avoid CRSs
 leading to uncertainty errors larger than 0.5 

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