Work Item
ASTM WK86760

Revision of E473-22d Standard Terminology Relating to Thermal Analysis and Rheology


Scope section 1.1 for standard E0473 on Terminology Relating to Thermal Analysis and Rheology reads in part, “This terminology includes only those terms for which ASTM either has standards or is contemplating some action. It is not intended to be an all-inclusive listing of terms relating to thermal analysis and rheology.

It is proposed to delete the term “evolved gas analysis” from Terminology E473 Terminology Relating to Thermal Analysis and Rheometry as this term finds use in no ASTM standard and therefore is moot for ASTM purposes.

evolved gas analysis (EGA), n – a technique in which the nature or amount, or both, of gas or vapor evolved by a substance is subjected to a controlled-
temperature program.

Discussion – Some specific forms of EGA have become established for investigating different species of catalysis, such as reduction, oxidation, or desorption. In this context, EGA in a hydrogen atmosphere is known as temperature-programed reduction (TPR); EGA in an oxygen atmosphere is temperature-programmed oxidation (TPO); and EGA in the absence of decomposition, in an inert atmosphere or vacuum, is temperature-programed desorption (TPD). For each technique the method used for gas identification and quantification should always be clearly stated.


Developed by Subcommittee: E37.03

Committee: E37

Staff Manager: Stephen Mawn

Work Item Status

Date Initiated: 06-09-2023

Technical Contact: Roger Blaine