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ASTM C338-93(1998)
ASTM C338-93(1998) Standard Test Method for Softening Point of Glass
standard by ASTM International, 10/10/1998
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M00087146
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1.1 This test method covers the determination of the softening point of a glass by determining the temperature at which a round fiber of the glass, nominally 0.65 mm in diameter and 235 mm long with specified tolerances, elongates under its own weight at a rate of 1 mm/min when the upper 100 mm of its length is heated in a specified furnace at the rate of 5 + 1
