ASTM-D4138 › Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
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Scope
1.1 These test methods cover the measurement of dry film thickness of coating films by microscopical observation of precision angular cuts in the coating film. Use of these methods usually requires repair of the coating film.
1.2 Three test methods are provided for measuring dry film thickness of protective coating system:
1.2.1 Test Method A--Using groove cutting instruments.
1.2.2 Test Method B --Using grinding instruments.
1.2.3 Test Method C --Using drill bit instruments.
1.3 The substrate should be sufficiently rigid to prevent deformation of the coating during the cutting process. The surface may be flat or moderately curved (pipes as small as 1 in. (25 mm) in diameter may be measured in the axial direction).
1.4 The range of thickness measurement is 0 to 50 mils (0 to 1.3 mm).
1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 This standard does not purport to address all of the safety problems, 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.
Keywords
destructive means; dry film thickness; individual coats; measurement; microscopic observation; overall thickness; reticle; scale
To find similar documents by ASTM Volume:
06.01 (Paint -- Tests for Chemical, Physical, and Optical Properties; Appearance)
To find similar documents by classification:
87.040 (Paints and varnishes Including coating powders, paint coatings and protective paint systems)
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Document Number
ASTM-D4138-07AR22
Revision Level
2007A R22 EDITION
Status
Current
Modification Type
Jurisdiction Change
Publication Date
July 1, 2022
Document Type
Test Method
Page Count
5 pages
Committee Number
D01.23