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Document ASTM D 4138 REV A is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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ASTM D 4138 REV A Document Information:
Title
Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
ASTM International
Publication Date:
Jul 1, 2007
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 and
health practices and determine the applicability of regulatory
limitations prior to use.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- coating thickness
- destructive means
- dry film thickness
- individual coats
- measurement
- microscopic observation
- overall thickness
- paint thickness
- reticle
- scale
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