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ASTM C148-00
Standard Test Methods for Polariscopic Examination of Glass Containers
Automaticky přeložený název:
Standardní metody zkoušek pro Polariscopic vyšetření skleněných obalů
NORMA vydána dne 10.4.2000
Informace o normě:
Označení normy: ASTM C148-00
Poznámka: NEPLATNÁ
Datum vydání normy: 10.4.2000
Kód zboží: NS-11467
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Anotace textu normy ASTM C148-00 :
Keywords:
annealing strain, polariscopic examination of glass containers (for annealing strain),, test, , Glass containers, polariscopic examination of glass containers (for annealing strain),, test, , Polariscopic examination, polariscopic examination of glass containers (for annealing strain),, test, ,Order Form, ICS Number Code 81.040.30 (Glass products)
Doplňující informace
| 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: Sections Test Method-A Comparison with Reference 6 to 9 Standards Using a Polariscope Test Method-B Determination with 10 to 12 Polarimeter1.2 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 ( ) the magnitude and distribution of the residual stress in the glass, ( ) the thickness of the glass (optical path length at the point of grading), and ( ) 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, R , in terms of the apparent temper number, A , and the bottom thickness, : R = A (0.160/ ) where is in inches, or R = A (4.06/ ) where is in millimeters. 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. |
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