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  • ASTM
    D7127-13 Standard Test Method for Measurement of Surface Roughness of Abrasive Blast Cleaned Metal Surfaces Using a Portable Stylus Instrument
    Edition: 2013
    $93.60
    Unlimited Users per year

Description of ASTM-D7127 2013

ASTM D7127 - 13

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

Active Standard ASTM D7127 | Developed by Subcommittee: D01.46

Book of Standards Volume: 06.02




ASTM D7127

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.

1. 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 ?m (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.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASME Standard

ASMEB46.1-2002 Surface Texture, Surface Roughness Waviness and Lay Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990.

ISO Standards

ISO4287:1997 Geometrical Product Specifications (GPS)--Surface Texture: Profile Method--Terms, Definitions, and Surface Parameters Available from International Organization for Standardization (ISO), 1 rue de Varemb, Case postale 56, CH-1211, Geneva 20, Switzerland.

Keywords

abrasive; abrasive blast cleaning; anchor pattern; peak count; surface profile; surface roughness;


ICS Code

ICS Number Code 25.220.10 (Surface preparation)


DOI: 10.1520/D7127-13

ASTM International is a member of CrossRef.

ASTM D7127

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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