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ASTM D5796-10

(Test Method)

Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring Device

Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring Device

SIGNIFICANCE AND USE
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.
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.)
SCOPE
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.

General Information

Status
Historical
Publication Date
30-Nov-2010
ICS
17.040.20 - Properties of surfaces
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.53 - Coil Coated Metal
Current Stage
Ref Project

Relations

Replaces
ASTM D5796-03(2010) - Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring Device
Effective Date
01-Dec-2010
Replaced By
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
Effective Date
01-Jun-2015
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
01-Dec-2010
Referred By
ASTM D7893-13(2018) - Standard Guide for Corrosion Test Panel Preparation, Testing, and Rating of Coil-Coated Building Products
Effective Date
01-Dec-2010
Referred By
ASTM D3361/D3361M-22 - Standard Practice for Unfiltered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings
Effective Date
01-Dec-2010
Referred By
ASTM D7835/D7835M-19 - Standard Test Method for Determining the Solvent Resistance of an Organic Coating Using a Mechanical Rubbing Machine
Effective Date
01-Dec-2010

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ASTM D5796-10 - Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring DeviceASTM D5796-10 - Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring Device
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REDLINE ASTM D5796-10 - Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring DeviceREDLINE ASTM D5796-10 - Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring Device
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D5796 − 10
StandardTest Method for
Measurement of Dry Film Thickness of Thin-Film Coil-
Coated Systems by Destructive Means Using a Boring
1
Device
This standard is issued under the fixed designation D5796; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.5 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
1.1 This test method covers the measurement of dry film
only.
thickness(DFT)ofcoatingfilmsbymicroscopicobservationof
1.6 This standard does not purport to address all of the
a precision-cut, shallow-angle crater bored into the coating
safety concerns, if any, associated with its use. It is the
film. This crater reveals cross sectional layers appearing as
responsibility of the user of this standard to establish appro-
rings, whose width is proportional to the depth of the coating
priate safety and health practices and determine the applica-
layer(s) and allows for direct calculation of dry film thickness.
bility of regulatory limitations prior to use.
1.1.1 The Apparatus, Procedure, and Precision and Bias
discussions include Method A and Method B. Method A
2. Referenced Documents
involves the use of an optical measurement apparatus which is
2
no longer commercially available, but remains a valid method 2.1 ASTM Standards:
of dry film measurement. Method B is a software driven D3794 Guide for Testing Coil Coatings
measurement procedure that supersedes Method A.
3. Significance and Use
1.2 The substrate may be any rigid, metallic material, such
3.1 Measurement of dry film thickness of organic coatings
as cold-rolled steel, hot-dipped galvanized steel, aluminum,
by physically cutting through the film and optically observing
etc. The substrate must be planar with the exception of
and measuring the thickness offers the advantage of direct
substrates exhibiting “coil set,” which may be held level by the
measurement as compared with nondestructive means.
use of the clamping tool on the drilling device.
3.2 Constituent coating layers of an overall thickness of a
NOTE 1—Variations in the surface profile of the substrate may result in
coating system can usually be measured individually by this
misrepresentative organic coating thickness readings. This condition may
exist over substrates such as hot-dipped, coated steel sheet. This is true of test method, provide adhesion between each layer is sufficient.
all “precision cut” methods that are used to determine dry film thickness
(However, this can be difficult in cases where the primer,
of organic coatings. This is why several measurements across the strip
topcoat, or multiple coating layers have the same, or very
may be useful if substrate surface profile is suspect.
similar, appearance.)
1.3 The range of thickness measurement is 0 to 3.5 mils (0
to 89 µm). 4. Apparatus
3
4.1 Dry Film Thickness Device, Itisanapparatusconsisting
NOTE 2—For DFTmeasurements of films greater than 3.5 mils (89µm),
but less than 63 mils (1600 µm), a 45° borer may be used in accordance of either a manual or automated carbide-tipped drill that raises
with this test method, with the exception of 6.8, where the micrometer
and lowers the boring tip perpendicular to the surface to be
reading would provide a direct read-out, and division by ten would be
tested, a cleaning brush, a marking device (optional), and a
unnecessary per 4.3.1 Method A.
1.4 Measurements may be made on coil-coated sheet, cer-
tain formed products, or on test panels.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1 3
This test method is under the jurisdiction of ASTM Committee D01 on Paint The sole source of supply of the dry film thickness device known to the
and Related Coatings, Materials, andApplications and is the direct responsibility of committee at this time is DJH Designs, 2366Wyecroft Rd., Unit D4, Oakville, Ont.,
Subcommittee D01.53 on Coil Coated Metal. Canada L6L 6M1. If you are aware of alternative suppliers, please provide this
Current edition approved Dec. 1, 2010. Published December 2010. Originally information to ASTM International Headquarters. Your comments will receive
1
approved in 1995. Last previous edition approved in 2010 as D5796 – 03 (2010). careful consideration at a meeting of the responsible technical committee, which
DOI: 10.1520/D5796-10. you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D5796–03(Reapproved2010) Designation:D5796–10
Standard Test Method for
Measurement of Dry Film Thickness of Thin-Film Coil-
Coated Systems by Destructive Means Using a Boring
1
Device
This standard is issued under the fixed designation D5796; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D3794 Guide for Testing Coil Coatings
3. Significance and Use
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.)
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.53 on Coil Coated Metal.
Current edition approved JuneDec. 1, 2010. Published JulyDecember 2010. Originally approved in 1995. Last previous edition approved in 20032010 as
D5796 – 03 (2010). DOI: 10.1520/D5796-03R10.10.1520/D5796-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D5796–10
NOTE 1—Thedrawingisnottoscale.Itisforillustrationpurposesonly.
NOTE 2—u = 5° 42’ ft 389 in.
Tan u = A/B = 0.1
A = 0.1B
FIG. 1 Typical Crater Formed by Boring Device
4. Apparatus
3
4.1 Dry Film T
...

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ASTM D7091-22(Practice)
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1.3 Coating thickness can be measured using a variety of gages. These gages are categorized as “magnetic pull-off” and “electronic.” They use a sensing probe or magnet to measure the gap (distance) between the base metal and the probe. This measured distance is displayed as coating thickness by the gages.  
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SCOPE
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ASTM D5796-20(Test Method)
Standard Test Method for Measurement of Dry Film Thickness of Thin-Film Coil-Coated Systems by Destructive Means Using a Boring Device

SIGNIFICANCE AND USE
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.)
FIG. 1 Typical Crater Formed by Boring Device
Note 1: The drawing is not to scale. It is for illustration purposes only.
Note 2: θ = 5.710593°
Tan θ = A/B = 0.1
A = 0.1B
SCOPE
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.  
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SCOPE
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1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
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SCOPE
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SIGNIFICANCE AND USE
5.1 Many physical and appearance properties of the finished coating are affected by the film thickness. Film thickness can affect the color, gloss, surface profile, adhesion, flexibility, impact resistance and hardness of the coating. The fit of pieces assembled after coating can be affected when film thickness is not within tolerance. Therefore coatings must be applied within certain minimum and maximum film thickness specifications to optimize their intended use.  
5.2 All procedures involve taking measurements of applied coating powders in the pre-cured, pre-gelled state to help insure correct cured film thickness. This enables the application system to be set up and fine-tuned prior to the curing process. In turn, this will reduce the amount of scrap and over-spray. Accurate predictions help avoid stripping and re-coating which can cause problems with adhesion and coating integrity.  
5.3 Measurements of cured powder coating thickness can be made using different methods depending upon the substrate. Non-destructive measurements over metal substrates can be made with magnetic and eddy current coating thickness gages (see Practice D7091). Non-destructive measurements over non-metal substrates can be made with ultrasonic coating thickness gages (see Test Method D6132). Destructive measurements over rigid substrates can be made with cross-sectioning instruments (see Practices D4138).
SCOPE
1.1 This practice describes the thickness measurement of dry coating powders applied to a variety of rigid substrates. Use of some of these procedures may require repair of the coating powder. This practice covers the use of portable instruments. It is intended to supplement the manufacturers’ instructions for their operation of the gages and is not intended to replace them. It includes definitions of key terms, reference documents, the significance and use of the practice, and the advantages and limitations of the instruments.  
1.2 Three procedures are provided for measuring dry coating powder thickness:  
1.2.1 Procedure A—Using rigid metal notched (comb) gages.  
1.2.2 Procedure B—Using magnetic or eddy current coating thickness gages.  
1.2.3 Procedure C—Using non-contact ultrasonic powder thickness instruments.  
1.3 Coating powders generally diminish in thickness during the curing process. Some of these procedures therefore require a reduction factor be established to predict cured film thickness of powder coatings.  
1.4 Procedure A and Procedure B  
measure the thickness (height or depth) of the applied coating powders in the pre-cured, pre-gelled state. By comparing results to the measured cured powder thickness in the same location, a reduction factor can be determined and applied to future thickness measurements of the same coating powder.  
1.5 Procedure C  
results in a predicted thickness value of the cured state based on a calibration for typical coating powders. If the powder in question is not typical then an adjustment can be made to align gage readings with the actual cured values as determined by other measurement methods.  
1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.7 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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ASTM
ASTM G98-23(Test Method)
Standard Test Method for Galling Resistance of Materials

SIGNIFICANCE AND USE
5.1 This test method is designed to rank material couples in their resistance to the failure mode caused by galling and not merely to classify the surface appearance of sliding surfaces.  
5.2 This test method should be considered when damaged (galled) surfaces render components non-serviceable. Experience has shown that galling is most prevalent in sliding systems that are slow moving and operate intermittently. The galling and seizure of threaded components is a classic example which this test method most closely simulates.  
5.3 Other galling-prone examples include: sealing surfaces of value trim which may leak excessively due to galling; and pump wear rings that may function ineffectively due to galling.  
5.4 If the equipment continues to operate satisfactorily and loses dimension gradually, then mechanical wear should be evaluated by a different test such as the crossed cylinder Test Method (see Test Method G83). Chain belt pins and bushings are examples of this type of problem.  
5.5 This test method should not be used for quantitative or final design purposes since many environmental factors influence the galling performance of materials in service. Lubrication, alignment, stiffness and geometry are only some of the factors that can affect how materials perform. This test method has proven valuable in screening materials for prototypical testing that more closely simulates actual service conditions.
SCOPE
1.1 This test method covers a laboratory test which ranks the galling resistance of material couples. Most galling studies have been conducted on bare metals and alloys; however, non-metallics, coatings, and surface modified alloys may also be evaluated by this test method.  
1.2 This test method is not designed for evaluating the galling resistance of material couples sliding under lubricated conditions because galling usually will not occur under lubricated sliding conditions using this test method.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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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ASTM
ASTM G99-23(Test Method)
Standard Test Method for Wear and Friction Testing with a Pin-on-Disk or Ball-on-Disk Apparatus

SIGNIFICANCE AND USE
5.1 The amount of wear in any system will, in general, depend upon the number of system factors such as the applied load, machine characteristics, sliding speed, sliding distance, the environment, and the material properties. The value of any wear test method lies in predicting the relative ranking of material combinations. Since the pin-on-disk test method does not attempt to duplicate all the conditions that may be experienced in service (for example, lubrication, load, pressure, contact geometry, removal of wear debris, and presence of corrosive environment), there is no insurance that the test will predict the wear rate of a given material under conditions differing from those in the test.  
5.2 The use of this test method will fall in one of two categories: (1) the test(s) will follow all particulars of the standard, and the results will have been compared to the ILS data (Table 2), or (2) the test(s) will have followed the procedures/methodology of Test Method G99 but applied to other materials or using other parameters such as load, speed, materials, etc., or both. In this latter case, the results cannot be compared to the ILS data (Table 2). Further, it must be clearly stated what choices of test parameters/materials were chosen.
SCOPE
1.1 This test method covers a laboratory procedure for determining the wear of materials and friction during sliding using a pin-on-disk apparatus. Materials are tested in pairs under nominally non-abrasive conditions. The principal areas of experimental attention in using this type of apparatus to measure wear are described.  
1.2 This test method standard uses a specific set of test parameters (load, sliding speed, materials, etc.) that were then used in an interlaboratory study (ILS), the results of which are given here (Tables 1 and 2). (This satisfies the ASTM form in that “The directions for performing the test should include all of the essential details as to apparatus, test specimen, procedure, and calculations needed to achieve satisfactory precision and bias.”) Any user should report that they “followed the requirements of ASTM G99,” where that is true.  
1.3 Now it is often found in practice that users may follow all instructions given here, but choose other test parameters, such as load, speed, materials, environment, etc., and thereby obtain different test results. Such a use of this standard is encouraged as a means to improve wear testing methodology. However, it must be clearly stated in any report that, while the directions and protocol in Test Method G99 were followed (if true), the choices of test parameters were different from Test Method G99 values, and the test results were therefore also different from the Test Method G99 results. This use should be described as having “followed the procedure of ASTM G99.” All test parameters that were used in such case must be stated.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 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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ASTM
ASTM E430-23(Test Method)
Standard Test Methods for Measurement of Gloss of High-Gloss Surfaces by Abridged Goniophotometry

SIGNIFICANCE AND USE
5.1 The gloss of metallic finishes is important commercially on metals for automotive, architectural, and other uses where these metals undergo special finishing processes to produce the appearances desired. It is important for the end-products, which use such finished metals that parts placed together have the same glossy appearance.  
5.2 It is also important that automotive finishes and other high-gloss nonmetallic surfaces possess the desired finished appearance. The present method identifies by measurements important aspects of finishes. Those having identical sets of numbers normally have the same gloss characteristics. It usually requires more than one measurement to identify properly the glossy appearance of any finish (see Refs 3 and 4).
SCOPE
1.1 These test methods cover the measurement of the reflection characteristics responsible for the glossy appearance of high-gloss surfaces. Two test methods, A and B, are provided for evaluating such surface characteristics at specular angles of 20° and 30°, respectively. These test methods are not suitable for diffuse finish surfaces nor do they measure color, another appearance attribute.  
1.2 As originally developed by Tingle and others (see Refs 1 and 2),2 the test methods were applied only to bright metals. Recently they have been applied to high-gloss automotive finishes and other nonmetallic surfaces.  
1.3 The DOI of a glossy surface is generally independent of its curvature. The DOI measurement by this test method is limited to flat or flattenable surfaces.  
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, health, and environmental 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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