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ASTM C965-23

Current Revision

Standard Practice for Measuring Viscosity of Glass Above the Softening Point

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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 106 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


3.1 This practice is useful in determining the viscosity-temperature relationships for glasses and corresponding useful working ranges. See Terminology C162.

SDO ASTM: ASTM International
Document Number C965
Publication Date May 1, 2023
Language en - English
Page Count 4
Revision Level 23
Supercedes
Committee C14.04
Publish Date Document Id Type View
May 1, 2023 C0965-23 Revision
Oct. 10, 1996 C0965-96 Revision
Nov. 1, 2017 C0965-96R17 Reaffirmation
March 1, 2012 C0965-96R12 Reaffirmation
April 1, 2007 C0965-96R07 Reaffirmation
Oct. 10, 1996 C0965-96R02 Reaffirmation