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ASTM
C338-93(2019)
Standard Test Method for Softening Point of Glass
2019
4
ASTM Vol.15.02 (2022)
This test method is useful to determine approximately the temperature below which the glass behaves as a rigid solid in glass-forming operations and for a control test to indicate changes in composition. It has been found useful for specification acceptance and for providing information in research and development work with glass.