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ASTM C 148 : 2017

ASTM C 148 : 2017

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Test Methods for Polariscopic Examination of Glass Containers

Available format(s)

Hardcopy , PDF

Superseded date

07-14-2022

Language(s)

English

Published date

05-23-2017

Publisher

American Society for Testing and Materials

These test methods describe the determination of relative optical retardation associated with the state of anneal of glass containers.

1.1These test methods describe the determination of relative optical retardation associated with the state of anneal of glass containers. Two alternative test methods are covered as follows:

Sections

Test Method A—Comparison with Reference Standards
     Using a Polariscope

6 – 9

Test Method B—Determination with Polarimeter

10 – 12

1.2Test Method A is useful in determining retardations less than 150 nm, while Test Method B is useful in determining retardations less than 565 nm.

Note 1:The apparent temper number as determined by these test methods depends primarily on (1) the magnitude and distribution of the residual stress in the glass, (2) the thickness of the glass (optical path length at the point of grading), and (3) the composition of the glass. For all usual soda-lime silica bottle glass compositions, the effect of the composition is negligible. In an examination of the bottom of a container, the thickness of glass may be taken into account by use of the following formula, which defines a real temper number, TR, in terms of the apparent temper number, TA, and the bottom thickness, t:

Equation C0148-17_1

Equation C0148-17_2

This thickness should be measured at the location of the maximum apparent retardation. Interpretation of either real or apparent temper number requires practical experience with the particular ware being evaluated.

1.3The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4This 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.

1.5This 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.

Committee
C 14
DocumentType
Test Method
Pages
4
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

ASTM C 162 : 2005 : R2015 Standard Terminology of<brk type="line"/> Glass and Glass Products
ASTM C 1426 : 2014 : R2020 Standard Practices for Verification and Calibration of Polarimeters
ASTM E 890 : 1994 : R2021 Standard Specification for Disposable Glass Culture Tubes
ASTM F 2179 : 2020 Standard Specification for Annealed Soda-Lime-Silicate Glass Containers That Are Produced for Use as Candle Containers
ASTM C 158 : 2002 : R2017 Standard Test Methods for Strength of Glass by Flexure (Determination of Modulus of Rupture)

ASTM C 1426 : 1999 : R2004 Standard Practices for Verification and Calibration of Polarimeters
ASTM C 1426 : 1999 Standard Practices for Verification and Calibration of Polarimeters
ASTM C 1426 : 2014 Standard Practices for Verification and Calibration of Polarimeters
ASTM C 1426 : 2009 Standard Practices for Verification and Calibration of Polarimeters

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Hardcopy - English
PDF - English
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