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ASTM C148

Standard Test Methods for Polariscopic Examination of Glass Containers

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Organization: ASTM
Publication Date: 1 May 2017
Status: active
Page Count: 4
ICS Code (Glass products): 81.040.30
scope:

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

Test 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:

TR = TA (0.160 ⁄ t), where t is in inches, or

TR = TA (4.06 ⁄ t), where t is in millimetres.

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.

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

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.

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.

Document History

ASTM C148
May 1, 2017
Standard Test Methods for Polariscopic Examination of Glass Containers
These test methods describe the determination of relative optical retardation associated with the state of anneal of glass containers. Test Method A is useful in determining retardations less than...
May 1, 2014
Standard Test Methods for Polariscopic Examination of Glass Containers
These test methods describe the determination of relative optical retardation associated with the state of anneal of glass containers. Test Method A is useful in determining retardations less than...
April 1, 2012
Standard Test Methods for Polariscopic Examination of Glass Containers
These test methods describe the determination of relative optical retardation associated with the state of anneal of glass containers. Two alternative test methods are covered. Test Method A is...
April 10, 2000
Standard Test Methods for Polariscopic Examination of Glass Containers
These 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: Test...
April 10, 2000
Standard Test Methods for Polariscopic Examination of Glass Containers
These 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: Test...
April 10, 2000
Standard Test Methods for Polariscopic Examination of Glass Containers
1. Scope 1.1 These 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...
September 10, 1995
Standard Test Methods for Polariscopic Examination of Glass Containers
A description is not available for this item.
July 15, 1992
STANDARD TEST METHODS FOR POLARISCOPIC EXAMINATION OF GLASS CONTAINERS
A description is not available for this item.
April 15, 1991
STANDARD TEST METHODS FOR POLARISCOPIC EXAMINATION OF GLASS CONTAINERS
A description is not available for this item.
August 31, 1990
STANDARD TEST METHODS FOR POLARISCOPIC EXAMINATION OF GLASS CONTAINERS
A description is not available for this item.
May 26, 1989
STANDARD TEST METHODS FOR POLARISCOPIC EXAMINATION OF GLASS CONTAINERS
A description is not available for this item.
January 28, 1977
Standard Methods of POLARISCOPIC EXAMINATION OF GLASS CONTAINERS
These methods for the polariscope examination of glassware cover the determination of the relative annealing strain in glass containers. Two alternative methods are covered as follows: Sections...
January 28, 1977
STANDARD METHODS OF POLARISCOPIC EXAMINATION OF GLASS CONTAINERS (E1-1985)
A description is not available for this item.

References

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