ASTM-C965 Standard Practice for Measuring Viscosity of Glass Above the Softening Point

ASTM-C965 - 1996 R17 EDITION - CURRENT
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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 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 cyclinders method; glass; viscosity ;; ICS Number Code 81.040.10 (Raw materials and raw glass)

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-C965-96(2017)

Revision Level

1996 R17 EDITION

Status

Current

Modification Type

Reapproval

Publication Date

Nov. 1, 2017

Document Type

Practice

Page Count

5 pages

Committee Number

C14.04