ASTM D7127-17

Standard Test Method for Measurement of Surface Roughness of Abrasive Blast Cleaned Metal Surfaces Using a Portable Stylus Instrument (Withdrawn 2021)

SIGNIFICANCE AND USE
5.1 This method may be useful in assuring conformance of a prepared surface to profile requirements specified by the manufacturer of a protective coating.  
5.2 This method includes determination of the peak density (number of profile peaks in a specified distance). Some workers in the field believe that optimizing peak height and peak density can improve coating adhesion.  
5.3 This method allows specifiers to objectively define surface texture after abrasive blast cleaning rather than using subjective terms such as “angular pattern” or “dense and uniform pattern.”  
5.4 Because implicit and explicit definitions of “roughness” may differ substantially, numerical characterizations of profile cannot be compared directly across different methods.
SCOPE
1.1 This test method describes a shop or field procedure for determination of roughness characteristics of surfaces prepared for painting by abrasive blasting. The procedure uses a portable skidded or non-skidded stylus profile tracing instrument. The measured characteristics are: Rt and Rpc. Additional measures of profile height (Rmax and/or Rz) may also be obtained as agreed upon by purchaser and seller. (The digitally-determined profile parameters Rt, Rmax, Ry and Rzlmax are extremely similar in definition.)  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 In general, this method should be limited to the measurement of surface roughness where Rt is in the range 10 to 150 μm (0.4 to 6 mil) and where the Peak Count, Rpc is less than 180 peaks/cm (450 peaks/in.).  
1.4 SSPC standard SSPC-PA 17 provides additional guidance for determining conformance with surface profile requirements.  
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.
WITHDRAWN RATIONALE
This test method describes a shop or field procedure for determination of roughness characteristics of surfaces prepared for painting by abrasive blasting. The procedure uses a portable skidded or non-skidded stylus profile tracing instrument. The measured characteristics are: Rt and Rpc. Additional measures of profile height (Rmax and/or Rz) may also be obtained as agreed upon by purchaser and seller. (The digitally-determined profile parameters Rt, Rmax, Ry and Rzlmax are extremely similar in definition.)
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in November 2021 and replaced by Test Methods D4417 for Field Measurement of Surface Profile of Blast Cleaned Steel.1

General Information

• Status: Withdrawn
• Publication Date: 30-Nov-2017
• ICS: 25.220.10 - Surface preparation
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.46 - Industrial Protective Coatings

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: D7127 − 17
Standard Test Method for
Measurement of Surface Roughness of Abrasive Blast
1
Cleaned Metal Surfaces Using a Portable Stylus Instrument
This standard is issued under the fixed designation D7127; 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 2. Referenced Documents
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1.1 This test method describes a shop or field procedure for
2.1 ASTM Standards:
determination of roughness characteristics of surfaces prepared D4417 Test Methods for Field Measurement of Surface
forpaintingbyabrasiveblasting.Theprocedureusesaportable
Profile of Blast Cleaned Steel
skidded or non-skidded stylus profile tracing instrument. The E177 Practice for Use of the Terms Precision and Bias in
measured characteristics are: Rt and Rpc. Additional measures
ASTM Test Methods
of profile height (Rmax and/or Rz) may also be obtained as E691 Practice for Conducting an Interlaboratory Study to
agreed upon by purchaser and seller. (The digitally-determined Determine the Precision of a Test Method
3
profile parameters Rt, Rmax, Ry and Rzlmax are extremely 2.2 SSPC Standard:
similar in definition.)
SSPC-PA 17 Procedure for Determining Conformance to
Steel Profile/Surface Roughness/Peak Count Require-
1.2 The values stated in SI units are to be regarded as the
ments
standard. The values given in parentheses are for information
2.3 ASME Standard:
only.
ASME B46.1-2002 Surface Texture, Surface Roughness
1.3 In general, this method should be limited to the mea- 4
Waviness and Lay
surement of surface roughness where Rt is in the range 10 to
2.4 ISO Standards:
150 µm (0.4 to 6 mil) and where the Peak Count, Rpc is less
ISO 4287: 1997 Geometrical Product Specifications
than 180 peaks/cm (450 peaks/in.).
(GPS)—Surface Texture: Profile Method—Terms,
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1.4 SSPC standard SSPC-PA 17 provides additional guid- Definitions, and Surface Parameters
ance for determining conformance with surface profile require-
3. Terminology
ments.
3.1 Definitions—The following definitions are provided as
1.5 This standard does not purport to address all of the
an aid to users of this document. Formal definitions of the
safety concerns, if any, associated with its use. It is the
surface roughness and instrument parameters below are con-
responsibility of the user of this standard to establish appro-
tained in the referenced standards (Fig. 1).
priate safety, health, and environmental practices and deter-
3.1.1 deadband, n—that distance above and below the mean
mine the applicability of regulatory limitations prior to use.
line that a continuous trace line must cross in both directions
1.6 This international standard was developed in accor-
(up and down) to count as a single peak.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
mendations issued by the World Trade Organization Technical contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
Barriers to Trade (TBT) Committee.
the ASTM website.
3
Available from The Society for Protective Coatings (SSPC), 800 Trumbull
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint Drive, Pittsburgh, PA 15205-4365, http://www.sspc.org.
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and Related Coatings, Materials, andApplications and is the direct responsibility of Available from American Society of Mechanical Engineers (ASME), ASME
Subcommittee D01.46 on Industrial Protective Coatings. International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
Current edition approved Dec. 1, 2017. Published January 2018. Originally www.asme.org.
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approved in 2005. Last previous edition approved in 2013 as D7127 – 13. DOI: Available from International Organization for Standardization (ISO), 1, ch. de
10.1520/D7127-17. la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7127 − 17
Top — Illustration of stylus device terminology: sampling length,
evaluation length, traverse length.
Bottom — Expanded view of a single sampling length to illustrate
surface structure terminology:
Rt: difference between highest peak and lowest valley over the
evaluation length.
Rmax: difference between highest peak and lowest valley over the
sampling. length
Pc: number
...