ASTM-C965 2023(Redline)

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C965-23 Standard Practice for Measuring Viscosity of Glass Above the Softening Point (Redline)

Published By	Publication Date	Number of Pages
ASTM	2023

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Categories: 81.040.10 - Raw materials and raw glass, ASTM

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Description

ASTM C965-23

Redline Standard: Standard Practice for Measuring Viscosity of Glass Above the Softening Point

ASTM C965

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 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.

Keywords

concentric cylinders method; glass; viscosity;

ICS Code

ICS Number Code 81.040.10 (Raw materials and raw glass)

DOI: 10.1520/C0965-23

Additional information

Standard Title	C965-23 Standard Practice for Measuring Viscosity of Glass Above the Softening Point (Redline)
Published Code	ASTM
Publication Date	2023
ICS Codes	81.040.10 - Raw materials and raw glass