ASTM D5235-18

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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: D5235 − 14 D5235 − 18
Standard Test Method for
Microscopic Measurement of Dry Film Thickness of
1
Coatings on Wood Products
This standard is issued under the fixed designation D5235; 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 covers the measurement of dry film thickness of coatings applied to a smooth, textured or curved rigid
substrate of wood or a wood-based productproduct.
1.2 This test method covers the preparation of wood or wood-based specimens for the purpose of microscopic measurement of
dry film thickness.
1.3 This test method suggests an analysis of dry film thickness of coatings on wood or wood-based products using a microscopic
measurement.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 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.
2. Referenced Documents
2
2.1 ASTM Standards:
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
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 dry film thickness or DFT, n—the thickness of dried, cured coating film on the substrate surface which may include
attached fibers but excludes free fibers that are encapsulated in the layer itself.
3.1.2 edge face, n—that part of the specimen that is a plane perpendicular to the surface showing a cross section of the coating
and substrate.
3.1.3 soak in, n—refers to a coating on a porous (wood) where the coating does not lie essentially on the surface of the wood
or wood-based product, but has penetrated into the fiber structure of the wood or wood-based material.
3.1.3.1 Discussion—
Wood or wood-based products are generally of a porous nature; sometimes exhibiting uniform absorption of coatings. Frequently
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 D01.52 on Factory Coated Wood Products.
Current edition approved Dec. 1, 2014Jan. 15, 2018. Published February 2015June 2018. Originally approved in 1992. Last previous edition approved in 20132014 as
D5235 – 13.D5235 – 14. DOI: 10.1520/D5235-14.10.1520/D5235-18.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5235 − 18
absorption of coatings is of a non-uniform nature and influenced by localized surface density differences or wood pore size. These
conditions of coating absorption are commonly referred to as soak in.
4. Summary of Test Method
4.1 A specimen of coated wood or wood-based product is cut to convenient size and edge face with the coating film
cross-section is prepared by polishing or cutting with a sharp blade.
4.2 The prepared edge of the specimen is imaged by a calibrated imaging system with known magnification in order to measure
the dry film thickness using an image analysis computer program.
4.3 Suggestions regarding interpretation of dry film thickness on porous wood or wood-based material are offered.
5. Significance and Use
5.1 As a base for calibration adju
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D5235 − 18
Standard Test Method for
Microscopic Measurement of Dry Film Thickness of
1
Coatings on Wood Products
This standard is issued under the fixed designation D5235; 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 E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method covers the measurement of dry film
thickness of coatings applied to a smooth, textured or curved
3. Terminology
rigid substrate of wood or a wood-based product.
3.1 Definitions of Terms Specific to This Standard:
1.2 This test method covers the preparation of wood or
3.1.1 dry film thickness or DFT, n—the thickness of dried,
wood-based specimens for the purpose of microscopic mea-
cured coating film on the substrate surface which may include
surement of dry film thickness.
attached fibers but excludes free fibers that are encapsulated in
1.3 This test method suggests an analysis of dry film
the layer itself.
thickness of coatings on wood or wood-based products using a
3.1.2 edge face, n—that part of the specimen that is a plane
microscopic measurement.
perpendicular to the surface showing a cross section of the
1.4 The values stated in either SI units or inch-pound units
coating and substrate.
are to be regarded separately as standard. The values stated in
3.1.3 soak in, n—refers to a coating on a porous (wood)
each system may not be exact equivalents; therefore, each
where the coating does not lie essentially on the surface of the
system shall be used independently of the other. Combining
wood or wood-based product, but has penetrated into the fiber
values from the two systems may result in non-conformance
structure of the wood or wood-based material.
with the standard.
3.1.3.1 Discussion—Wood or wood-based products are gen-
1.5 This standard does not purport to address all of the
erally of a porous nature; sometimes exhibiting uniform
safety concerns, if any, associated with its use. It is the
absorption of coatings. Frequently absorption of coatings is of
responsibility of the user of this standard to establish appro-
a non-uniform nature and influenced by localized surface
priate safety, health, and environmental practices and deter-
density differences or wood pore size. These conditions of
mine the applicability of regulatory limitations prior to use.
coating absorption are commonly referred to as soak in.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Summary of Test Method
ization established in the Decision on Principles for the
4.1 A specimen of coated wood or wood-based product is
Development of International Standards, Guides and Recom-
cut to convenient size and edge face with the coating film
mendations issued by the World Trade Organization Technical
cross-section is prepared by polishing or cutting with a sharp
Barriers to Trade (TBT) Committee.
blade.
2. Referenced Documents
4.2 The prepared edge of the specimen is imaged by a
2
2.1 ASTM Standards:
calibrated imaging system with known magnification in order
E177 Practice for Use of the Terms Precision and Bias in
to measure the dry film thickness using an image analysis
ASTM Test Methods
computer program.
4.3 Suggestions regarding interpretation of dry film thick-
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
ness on porous wood or wood-based material are offered.
and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.52 on Factory Coated Wood Products.
5. Significance and Use
Current edition approved Jan. 15, 2018. Published June 2018. Originally
approved in 1992. Last previous edition approved in 2014 as D5235 – 14. DOI:
5.1 As a base for calibration adjustment or accuracy verifi-
10.1520/D5235-18.
2
cation of dry film coating thickness measuring instruments.
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
5.2 The dry film thickness of coatings on wood or wood-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. based products is specified in written product warranties for
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5235 − 18
proper decorative and protective performance of coatings on 8. Procedure
wood or wood-based products.
8.1 Specimen Preparation—Sel
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