ASTM-C148 › Historical Revision Information
Standard Test Methods for Polariscopic Examination of Glass Containers
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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 follows:
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Test Method A—Comparison with Reference | 6 to 9 |
Test Method B—Determination with Polarimeter | 10 to 12 |
1.2 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.
T R = 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.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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.
Significance and Use
4.1 These two test methods are provided for evaluating the quality of annealing. These test methods can be used in the quality control of glass containers or other products made of similar glass compositions, where the degree of annealing must be verified to ensure quality products. These test methods apply to glass containers manufactured from commercial soda-lime-silica glass compositions.
Keywords
ICS Number Code 81.040.30 (Glass products)
To find similar documents by ASTM Volume:
15.02 (Glass; Ceramic Whitewares)
To find similar documents by classification:
81.040.30 (Glass products Bottles, pots, jars, see 55.100 Laboratory glassware, see 71.040.20)
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Document Number
ASTM-C148-14
Revision Level
2014 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
June 1, 2014
Document Type
Test Method
Page Count
4 pages
Committee Number
C14.07