Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D For this reason, surface profile should be measured prior to coating application to ensure conformance of a prepared surface to profile requirements specified by the manufacturer of a protective coating or the coating job specification. The instruments described are readily portable and sufficiently sturdy for use in the field.
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Method B may also be appropriate to the measurement of profile produced by using power tools. Depending on the radius of the surface, the results could have greater variability with lower values and averages.
The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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.
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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Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C
Authored by Alana Fossa. For hot-dip galvanizing applications, it is possible to measure and verify the steel surface profile according to ASTM D, Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel, prior to application of repair materials where the surface has been prepared via power tool or abrasive blast cleaning methods. Recent changes to ASTM D provide updated test methods to reflect the latest advances in technology and newly accepted industry research. The three test methods described within D for measuring surface profile include visual comparators, surface profile depth micrometers, and replica tape. Only the use of surface profile depth micrometers and replica tape were updated, and the specification changes are as follows:. Larger repair areas or prepared hot-dip galvanized surfaces for painting can be measured with 10 readings taken from a minimum of three, 6x6 inch 15x15 cm areas. The standard does not address discarding outliers, but an update to the standard addressing outlier readings is planned.
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What is Surface Profile and Why is it Necessary? Surface profile is defined as a measurement of the maximum peak-to-valley depth created by abrasive impingement against a surface during abrasive blast cleaning operations, or by an impact-type power tool. During abrasive blast cleaning, the mass of the abrasive and the velocity of the abrasive movement created by compressed air generates kinetic energy the abrasive can reach speeds of over miles per hour as it exits the blast nozzle. When the abrasive impacts the surface, it cuts into the surface angular abrasives or peens the surface round abrasives and creates a series of peaks and valleys in the surface.