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ASTM C148-17
Standard Test Methods for Polariscopic Examination of Glass Containers
Přeložit název
NORMA vydána dne 1.5.2017
Informace o normě:
Označení normy: ASTM C148-17
Poznámka: NEPLATNÁ
Datum vydání normy: 1.5.2017
Kód zboží: NS-684058
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM C148-17 :
Keywords:
ICS Number Code 81.040.30 (Glass products)
Doplňující informace
| Significance and Use | ||||||||||||
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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. |
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| 1. Scope | ||||||||||||
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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:
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. 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,
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. 1.5 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. |
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| 2. Referenced Documents | ||||||||||||
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