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Monographs and General Chapters Affected by Omission of <21> Thermometers

Type of Posting: Notice of Intent to Revise

Posting Date: 31–Jul–2015

Targeted Official Date: 01–May–2016

Expert Committee: Various

In accordance with section 7.05(c) of the 2010–2015 Rules and Procedures of the Council of Experts, this is to provide notice that USP and its Expert Committees, as applicable, intend to revise multiple monographs and General Chapters in response to the omission of General Chapter <21> Thermometers.

General Chapter <21> was proposed for comment in Pharmacopeial Forum 41(1) and will appear in USP 39–NF 34 with an official date of May 1, 2016. The reference to General Chapter <21> Thermometers will be replaced with a reference to General Notices 6.80.30. Temperature Reading Devices. The following is a list of the affected General Chapters and monographs:

  • <651> Congealing Temperature
  • <721> Distilling Range
  • <1118> Monitoring devices-time, temperature, and humidity
  • Emulsifying Wax

All modifications will become official on May 1, 2016 to coincide with the omission of General Chapter <21>.

Please also see the Compendial Notice: New Revision Markup for Reference Changes in USP–NF for details on the revision markup used to identify the reference updates.

Interested stakeholders are encouraged to alert USP staff to any other effects they may recognize related to the revision of General Chapter <21>.

Should you have any questions or comments, please contact Antonio Hernandez-Cardoso, Senior Scientific Liaison (301-816-8308 or