The test is performed just after sandblasting; the selected spot is cleaned by blowing air to remove loose dust that is the product of sandblasting. Two type of replica tapes is available in the market i. The surface profile measurement almost is a mandatory requirement by most coating specifications. The "Coarse Tape" was made for the surface profile of 0. You should pick the replica tape which is much closer to your customer specification.
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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. There are additional techniques suitable for laboratory use not covered by these test methods. The values given in parentheses are for information only. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and deter- mine the applicability of regulatory limitations prior to use.
Summary of Test Method 2. Current edition approved Nov. Published November Originally approved in Last previous edition approved in as D — DOI: Apparatus 4. Keane, Joseph A.
Bruno, Jr. Test Specimens 5. Procedure 6. Adjust the instrument to zero. Do not drag the instrument across the surface between readings, or the spring-loaded tip may become rounded leading to false readings. At each location make ten readings and determine the mean. Remove the wax paper backing and place the tape on the prepared surface with the foam side down, that is, put the dull side down. Your comments will receive careful consideration at a meeting of the responsible technical committee, 1 which you may attend 6.
At each location make three readings and determine the mean. Report 7. Precision and Bias 8.
Differences in Surface Profile Measurements: ASTM D4417- Method B vs. Method C
Surface Profile Measurement by Replica Tape
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. According to research performed by Roper, Weaver and Brandon6, an increase in peak count can improve the adhesion of some coatings to the prepared steel, as well as provide greater resistance to corrosion undercutting once the coating becomes damaged in service.
ASTM D4417 - 11 Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned.pdf
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. 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.