Designation: A 754/A 754M – 06
Standard Test Method for
Coating Weight (Mass) of Metallic Coatings on Steel by
X-Ray Fluorescence
1
This standard is issued under the fixed designation A 754/A 754M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers the use of X-ray fluorescence
(XRF) for determining the coating weight (mass) of metallic
coatings on steel sheet. The test method is intended to be used
for “on-line” measurements of coating on continuous produc-
tion lines.
1.2 This test method is applicable to the coatings covered by
the following ASTM specifications:
A 599/A 599M, A 623,
A 623M, A 653/A 653M, A 792/A 792M, A 875/A 875M,
A 879/A 879M, A 918, and A 924/A 924M. It may be appli-
cable to other coatings, providing that the elemental nature of
the coating and substrate are compatible with the technical
aspects of XRF such as the absorption coefficient of the
system, primary radiation, fluorescent radiation, type of detec-
tion.
1.3 This test method includes the procedure for developing
a single standard determination of coating weight (mass).
1.4 This test method includes procedures for both X-ray
tube and isotope coating weight (mass) measuring instruments.
1.5 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system shall
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specifi-
cation.
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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
2
A 599/A 599M Specification for Tin Mill Products, Electro-
lytic Tin-Coated, Cold-Rolled Sheet
A 623 Specification for Tin Mill Products, General Require-
ments
A 623M Specification for Tin Mill Products, General Re-
quirements [Metric]
A 653/A 653M Specification for Steel Sheet, Zinc-Coated
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
by the Hot-Dip Process
A 792/A 792M Specification for Steel Sheet, 55 %
Aluminum-Zinc Alloy-Coated by the Hot-Dip Process
A 875/A 875M Specification for Steel Sheet, Zinc-5 %
Aluminum Alloy-Coated by the Hot-Dip Process
A 879/A 879M Specification for Steel Sheet, Zinc Coated
by the Electrolytic Process for Applications Requiring
Designation of the Coating Mass on Each Surface
A 902 Terminology Relating to Metallic Coated Steel Prod-
ucts
A 918 Specification for Steel Sheet, Zinc-Nickel Alloy
Coated by the Electrolytic Process for Applications Re-
quiring Designation of the Coating Mass on Each Surface
A 924/A 924M Specification for General Requirements for
Steel Sheet, Metallic-Coated by the Hot-Dip Process
3. Terminology
3.1 Definitions—For general definitions of terms relating to
metallic-coated steel products, see Terminology
A 902.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 averaging time, n—the period over which an elec-
tronic measuring instrument acquires samples or “counts” prior
to each update of coating weight (mass) output; refer to
X1.2
for a more detailed explanation.
1
This test method is under the jurisdiction of ASTM Committee A05 on Metallic
Coated Iron and Steel Products and is the direct responsibility of Subcommittee
A05.07 on Methods of Testing.
Current edition approved June 1, 2006. Published June 2006. Originally
approved in 1979. Last previous edition approved in 2004 as A 754/A 754M -
96(2004).
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
*A Summary of Changes section appears at the end of this standard.
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