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Standard Test Methods for Polariscopic Examination of Glass Containers
Automaticky přeložený název:
Standardní metody zkoušek pro Polariscopic vyšetření skleněných obalů
NORMA vydána dne 1.4.2012
Označení normy: ASTM C148-12
Poznámka: NEPLATNÁ
Datum vydání normy: 1.4.2012
Kód zboží: NS-11468
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
Annealing strain, Glass containers, Polariscopic examination, ICS Number Code 55.100 (Bottles. Pots. Jars)
Significance and Use | ||||||||
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 | ||||||||
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, TR, in terms of the apparent temper
number, TA, and the bottom
thickness, t: 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. |
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2. Referenced Documents | ||||||||
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