ASTM-C965 › Standard Practice for Measuring Viscosity of Glass Above the Softening Point
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Scope
1.1 This practice covers the determination of the viscosity of glass above the softening point through the use of a platinum alloy spindle immersed in a crucible of molten glass. Spindle torque, developed by differential angular velocity between crucible and spindle, is measured and used to calculate viscosity. Generally, data are taken as a function of temperature to describe the viscosity curve for the glass, usually in the range from 1 to 10 6 Pa·s.
1.2 Two procedures with comparable precision and accuracy are described and differ in the manner for developing spindle torque. Procedure A employs a stationary crucible and a rotated spindle. Procedure B uses a rotating crucible in combination with a fixed spindle.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywords
concentric cyclinders method; glass; viscosity
To find similar documents by ASTM Volume:
15.02 (Glass; Ceramic Whitewares)
To find similar documents by classification:
81.040.10 (Raw materials and raw glass)
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Document Number
ASTM-C0965-23
Revision Level
2023 EDITION
Status
Current
Modification Type
Revision
Publication Date
May 24, 2023
Document Type
Practice
Page Count
4 pages
Committee Number
C14.04