ASTM D5235-13
(Test Method)Standard Test Method for Microscopical Measurement of Dry Film Thickness of Coatings on Wood Products
Standard Test Method for Microscopical Measurement of Dry Film Thickness of Coatings on Wood Products
SIGNIFICANCE AND USE
4.1 The dry film thickness of coatings on wood or wood-based products is specified in written product warranties for proper decorative and protective performance of coatings on wood or wood-based products.
4.2 The minimum and maximum dry film thickness of coatings is recommended by coating companies for satisfactory decorative and protective performance on wood or wood-based products.
4.3 The average dry film thickness of coatings on wood or wood-based material may be used by manufacturing companies to calculate theoretical cost of applied coatings. By comparison with actual cost, utilization efficiency may be calculated.
4.4 The ratio of peak to valley dry film thickness on textured products is used as an indication of coating uniformity.
4.5 Specific coated product requirements may dictate certain film thickness determinations to be made. Discussions between buyer and seller may be advisable to accommodate product needs relative to dry film thickness.
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 product
1.2 This test method covers the preparation of wood or wood-based specimens for the purpose of microscopical measurement of dry film thickness.
1.3 This test method suggests an interpretation of dry film thickness of coatings on wood or wood-based products when porous substrates are coated.
1.4 This test method suggests an interpretation of dry film thickness of coatings on wood or wood-based products when substrate attached or non-attached fibers occur in the dry film.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.6 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. Some specific hazards statements are given in Section 7 on Hazards.
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Designation: D5235 − 13
StandardTest Method for
Microscopical Measurement of Dry Film Thickness of
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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 2.1.3 soak in, n—refers to a coating on a porous substrate
where the coating does not lie essentially on the surface of the
1.1 This test method covers the measurement of dry film
wood or wood-based product, but has penetrated into the fiber
thickness of coatings applied to a smooth, textured or curved
structure of the wood or wood-based material.
rigid substrate of wood or a wood-based product
2.1.3.1 Discussion—Wood or wood-based products are gen-
1.2 This test method covers the preparation of wood or
erally of a porous nature; sometimes exhibiting uniform
wood-based specimens for the purpose of microscopical mea-
absorption of coatings. Frequently absorption of coatings is of
surement of dry film thickness.
a nonuniform nature and influenced by localized surface
1.3 This test method suggests an interpretation of dry film density differences or wood pore size. These conditions of
coating absorption are commonly referred to as soak in.
thickness of coatings on wood or wood-based products when
porous substrates are coated.
3. Summary of Test Method
1.4 This test method suggests an interpretation of dry film
3.1 A specimen of coated wood or wood-based product is
thickness of coatings on wood or wood-based products when
cut to convenient size and edge polished with sandpaper.
substrate attached or non-attached fibers occur in the dry film.
3.2 The polished edge of the specimen is viewed through a
1.5 The values stated in inch-pound units are to be regarded
calibrated microscope in order to measure dry film thickness.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3.3 Suggestions regarding interpretation of dry film thick-
and are not considered standard.
ness on porous wood or wood-based material are offered.
1.6 This standard does not purport to address all of the
3.4 Suggestions regarding interpretation of dry film thick-
safety concerns, if any, associated with its use. It is the
ness on wood or wood-based material that have attached or
responsibility of the user of this standard to establish appro-
encapsulated fibers in the coating are offered.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Some specific
4. Significance and Use
hazards statements are given in Section 7 on Hazards.
4.1 The dry film thickness of coatings on wood or wood-
based products is specified in written product warranties for
2. Terminology
proper decorative and protective performance of coatings on
2.1 Definitions of Terms Specific to This Standard:
wood or wood-based products.
2.1.1 dry film thickness, n—that layer of thickness of dried
4.2 The minimum and maximum dry film thickness of
coating above the microscopically visible board surface that
coatingsisrecommendedbycoatingcompaniesforsatisfactory
also comprises attached fibers but excludes free fibers that are
decorative and protective performance on wood or wood-based
encapsulated in the layer itself.
products.
2.1.2 edge face, n—that part of the specimen that is a plane
4.3 The average dry film thickness of coatings on wood or
perpendicular to the surface showing a cross section of the
wood-based material may be used by manufacturing compa-
coating and substrate.
nies to calculate theoretical cost of applied coatings. By
comparison with actual cost, utilization efficiency may be
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This test method is under the jurisdiction of ASTM Committee D01 on Paint calculated.
and Related Coatings, Materials, andApplications and is the direct responsibility of
4.4 Theratioofpeaktovalleydryfilmthicknessontextured
Subcommittee D01.52 on Factory Coated Wood Products.
Current edition approved Nov. 1, 2013. Published December 2013. Originally products is used as an indication of coating uniformity.
approved in 1992. Last previous edition approved in 1997 as D5235 – 97 which was
4.5 Specific coated product requirements may dictate cer-
withdrawn January 2006 and reinstated in November 2013. DOI: 10.1520/D5235-
13. tain film thickness determinations to be made. Discussions
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D5235 − 13
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between buyer and seller may be advisable to accommodate 8.1.2 Cutthisspeciment
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