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ASTM D5796-10(2015)
Standard Test Method for Measurement of Dry Film Thickness of Thin-Film Coil-Coated Systems by Destructive Means Using a Boring Device
Automaticky preložený názov:
Štandardná skúšobná metóda pre meranie DFT tenkovrstvových Coil - Coated systémy deštruktívnymi prostriedky pomocou nudný zariadení
NORMA vydaná dňa 1.6.2015
Informácie o norme:
Označenie normy: ASTM D5796-10(2015)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.6.2015
Kód tovaru: NS-591360
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D5796-10(2015) :
Keywords:
borer bit, boring, crater, destructive, dry film, measure stage, micrometer, optical measurement, thickness, thin films, video camera,, ICS Number Code 17.040.20 (Properties of surfaces)
Doplňujúce informácie
| Significance and Use | ||
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3.1 Measurement of dry film thickness of organic coatings by physically cutting through the film and optically observing and measuring the thickness offers the advantage of direct measurement as compared with nondestructive means. 3.2 Constituent coating layers of an overall thickness of a coating system can usually be measured individually by this test method, provide adhesion between each layer is sufficient. (However, this can be difficult in cases where the primer, topcoat, or multiple coating layers have the same, or very similar, appearance.) A = 0.1B
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| 1. Scope | ||
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1.1 This test method covers the measurement of dry film thickness (DFT) of coating films by microscopic observation of a precision-cut, shallow-angle crater bored into the coating film. This crater reveals cross sectional layers appearing as rings, whose width is proportional to the depth of the coating layer(s) and allows for direct calculation of dry film thickness. 1.1.1 The Apparatus, Procedure, and Precision and Bias discussions include Method A and Method B. Method A involves the use of an optical measurement apparatus which is no longer commercially available, but remains a valid method of dry film measurement. Method B is a software driven measurement procedure that supersedes Method A. 1.2 The substrate may be any rigid, metallic material, such as cold-rolled steel, hot-dipped galvanized steel, aluminum, etc. The substrate must be planar with the exception of substrates exhibiting “coil set,” which may be held level by the use of the clamping tool on the drilling device. Note 1: Variations in the surface profile of the substrate may
result in misrepresentative organic coating thickness readings.
This condition may exist over substrates such as hot-dipped, coated
steel sheet. This is true of all “precision cut” methods that are
used to determine dry film thickness of organic coatings. This is
why several measurements across the strip may be useful if
substrate surface profile is suspect.
1.3 The range of thickness measurement is 0 to 3.5 mils (0 to 89 μm). Note 2: For DFT measurements of films greater than 3.5 mils
(89μm), but less than 63 mils (1600 μm), a 45° borer may be used in
accordance with this test method, with the exception of 6.8, where
the micrometer reading would provide a direct read-out, and
division by ten would be unnecessary per 4.3.1 Method A.
1.4 Measurements may be made on coil-coated sheet, certain formed products, or on test panels. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.6 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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