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ASTM D4138

Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means

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Organization: ASTM
Publication Date: 1 July 2007
Status: active
Page Count: 5
ICS Code (Paints and varnishes): 87.040
scope:

This practice describes the measurement of dry film thickness of coating films by microscopic observation of precision angular cuts in the coating film. Use of these procedures may require repair of the coating film. This practice is intended to supplement the manufacturers' instructions for the manual operation of the gages and is not intended to replace them. It includes definitions of key terms, reference documents, the significance and use of the practice, and the advantages and limitations of the instruments.

Three procedures are provided for measuring dry film thickness of protective coating systems:

Procedure A-Using groove cutting instruments.

Procedure B-Using grinding instruments.

Procedure C-Using drill bit instruments.

These procedures are not applicable for soft or ductile substrates that may deform under the test gage cutting tip. 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 25 mm (1 in.) in diameter may be measured in the axial direction.

Individual coats in a multicoat system where there is a discernible visual difference between coats or the overall thickness of a coating system can be measured by these procedures.

The range of thickness measurement is typically 2 to 2000 microns (0.1 to 80 mils) and depends upon the cutting angle of the blade.

The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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.

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.

Document History

ASTM D4138
July 1, 2007
Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
This practice describes the measurement of dry film thickness of coating films by microscopic observation of precision angular cuts in the coating film. Use of these procedures may require repair of...
July 1, 2007
Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
This practice describes the measurement of dry film thickness of coating films by microscopic observation of precision angular cuts in the coating film. Use of these procedures may require repair of...
July 1, 2007
Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
This practice describes the measurement of dry film thickness of coating films by microscopic observation of precision angular cuts in the coating film. Use of these procedures may require repair of...
February 1, 2007
Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
This practice describes the measurement of dry film thickness of coating films by microscopic observation of precision angular cuts in the coating film. Use of these procedures may require repair of...
January 15, 1994
Standard Test Methods for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive Means
These test methods cover the measurement of dry film thickness of coating films by microscopic observation of precision angular cuts in the coating film. Use of these methods may require repair of...
January 15, 1994
Standard Test Methods for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive Means
These test methods cover the measurement of dry film thickness of coating films by microscopic observation of precision angular cuts in the coating film. Use of these methods may require repair of...
January 15, 1994
Standard Test Methods for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive Means
1. 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...
February 26, 1988
STANDARD TEST METHOD FOR MEASUREMENT OF DRY FILM THICKNESS OF PROTECTIVE COATING SYSTEMS BY DESTRUCTIVE MEANS
A description is not available for this item.
May 28, 1982
STANDARD METHOD OF MEASUREMENT OF DRY FILM THICKNESS OF PROTECTIVE COATING SYSTEMS BY DESTRUCTIVE MEANS
A description is not available for this item.

References

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