ASTM D 5796 : 2024
Current
The latest, up-to-date edition.
Standard Test Method for Measurement of Dry Film Thickness of Thin-Film Coil-Coated Systems by Destructive Means Using a Boring Device
Hardcopy , PDF
English
23-09-2024
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
D 01
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| DocumentType |
Test Method
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| Pages |
5
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| PublisherName |
American Society for Testing and Materials
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| Status |
Current
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| Supersedes |
1.1This 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.
1.1.1The Apparatus, Procedure, and Precision and Bias discussions include Method A and Method B. Method A involves the use of an optical measurement apparatus. (This is a “first-generation” device.) Method B is a software driven second-generation measurement procedure that supersedes Method A.
1.2The 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.
1.3The range of thickness measurement is 0 μm to 89 μm (0 mils to 3.5 mils).
Note 2:For DFT measurements of films greater than 89 μm (3.5 mils), but less than 1600 μm (63 mils), 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.
1.4Measurements may be made on coil-coated sheet, certain formed products, or on test panels.
1.5The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7This 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.
| ASTM A 1003/A1003M : 2023 : EDT 1 | Standard Specification for Steel Sheet, Carbon, Metallic- and Nonmetallic-Coated for Cold-Formed Framing Members |
| ASTM A 755/A755M : 2018 : R2024 | Standard Specification for Steel Sheet, Metallic Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Process for Exterior Exposed Building Products |
| ASTM D 3361/D3361M : 2022 | Standard Practice for Unfiltered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings |
| ASTM D 3794 : 2022 | Standard Guide for Testing Coil Coatings |
| ASTM D 7893 : 2013 : R2018 | Standard Guide for Corrosion Test Panel Preparation, Testing, and Rating of Coil-Coated Building Products |
| ASTM D 7835/D7835M : 2023 | Standard Test Method for Determining the Solvent Resistance of an Organic Coating Using a Mechanical Rubbing Machine |
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