ASTM D7127-13
(Test Method)Standard Test Method for Measurement of Surface Roughness of Abrasive Blast Cleaned Metal Surfaces Using a Portable Stylus Instrument
Standard Test Method for Measurement of Surface Roughness of Abrasive Blast Cleaned Metal Surfaces Using a Portable Stylus Instrument
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 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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Designation: D7127 − 13
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 2.2 ASME Standard:
ASME B46.1-2002 Surface Texture, Surface Roughness
1.1 This test method describes a shop or field procedure for
3
Waviness and Lay
determination of roughness characteristics of surfaces prepared
forpaintingbyabrasiveblasting.Theprocedureusesaportable 2.3 ISO Standards:
skidded or non-skidded stylus profile tracing instrument. The ISO 4287: 1997 Geometrical Product Specifications
measured characteristics are: Rt and Rpc. Additional measures (GPS)—Surface Texture: Profile Method—Terms,
4
of profile height (Rmax and/or Rz) may also be obtained as Definitions, and Surface Parameters
agreed upon by purchaser and seller. (The digitally-determined
profile parameters Rt, Rmax, Ry and Rzlmax are extremely 3. Terminology
similar in definition.)
3.1 Definitions—The following definitions are provided as
1.2 The values stated in SI units are to be regarded as the an aid to users of this document. Formal definitions of the
standard. The values given in parentheses are for information
surface roughness and instrument parameters below are con-
only. tained in the referenced standards (Fig. 1).
3.1.1 deadband, n—that distance above and below the mean
1.3 In general, this method should be limited to the mea-
line that a continuous trace line must cross in both directions
surement of surface roughness where Rt is in the range 10 to
(up and down) to count as a single peak.
150 µm (0.4 to 6 mil) and where the Peak Count, Rpc is less
3.1.1.1 Discussion—Use of a deadband diminishes the ef-
than 180 peaks/cm (450 peaks/in.).
fect of small, spurious peaks due to noise.
1.4 This standard does not purport to address all of the
3.1.2 evaluation length, n—a sequence of five consecutive
safety concerns, if any, associated with its use. It is the
sampling lengths.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 3.1.3 Rpc, n—the number of peak/valley pairs, per unit of
bility of regulatory limitations prior to use. length, extending outside a “deadband” centered on the mean
line.
2. Referenced Documents
3.1.4 Rt, n—the vertical distance between the highest peak
2
and lowest valley within any given evaluation length.
2.1 ASTM Standards:
D4417 Test Methods for Field Measurement of Surface 3.1.5 Rmax, n—the greatest vertical distance between high-
Profile of Blast Cleaned Steel
est peak and lowest valley for any of the five sampling lengths
E177 Practice for Use of the Terms Precision and Bias in that comprise an evaluation length.
ASTM Test Methods
3.1.6 Rz, n—the vertical distance between the highest peak
E691 Practice for Conducting an Interlaboratory Study to
and lowest valley in a sampling length averaged over the five
Determine the Precision of a Test Method
sampling lengths comprising the evaluation length.
3.1.7 sampling length, n—the nominal distance parallel to
the surface being assessed within which a single value of a
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
surface parameter is determined.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved Feb. 1, 2013. Published May 2013. Originally
approved in 2005. Last previous edition approved in 2005 as D7127 – 05. DOI:
3
10.1520/D7127-13. Available from American Society of Mechanical Engineers (ASME), ASME
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.asme.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from International Organization for Standardization (ISO), 1, ch. de
the ASTM website. 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
1
---------------------- Page: 1 ----------------------
D7127 − 13
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
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: D7127 − 05 D7127 − 13
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
1.1 This test method describes a shop or field procedure for determination of four roughness characteristics of surfaces prepared
for painting by abrasive blasting. The procedure uses a portable skidded or non-skidded stylus profile tracing instrument. The three
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 Pc.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 RmaxRt is in the range 10 to 150
μm (0.4 to 6 mil) and where the Peak Count, Pc,Rpc is less than 180 peaks/cm (450 peaks/in.).
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D4417 Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 ASME Standard:
3
ASME B46.1-2002 Surface Texture, Surface Roughness Waviness and Lay
2.3 ISO Standards:
ISO 4287: 1997 Geometrical Product Specifications (GPS)—Surface Texture: Profile Method—Terms, Definitions, and Surface
4
Parameters
3. Terminology
3.1 Definitions—The following definitions are provided as an aid to users of this document. Formal definitions of the surface
roughness and instrument parameters below are contained in the referenced standards.standards (Fig. 1).
3.1.1 deadband, n—that distance above and below the mean line that a continuous trace line must cross in both directions (up
and down) to count as a single peak.
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 D01.46 on Industrial Protective Coatings.
Current edition approved Dec. 1, 2005Feb. 1, 2013. Published January 2006May 2013. Originally approved in 2005. Last previous edition approved in 2005 as D7127
– 05. DOI: 10.1520/D7127-05.10.1520/D7127-13.
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.
3
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990.10016-5990,
http://www.asme.org.
4
Available from International Organization for Standardization (ISO), 1 rue de Varembé, Case postale 56, CH-1211, Geneva 20, Switzerland. 1, ch. de la Voie-Creuse,
CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
3.1.1.1 Discussion—
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7127 − 13
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 of peak/valley pairs, per unit length extending outside
a deadband centered on the mean line.
FIG. 1 Illustration of Terminology
Use of a deadband diminishes the effect of small, spurious peaks due to noise.
3.1.2 evaluation length, n—a sequence of five consecutive sampli
...
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