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www.thinkSRS.com 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