1、Designation:D523514Standard Test Method forMicroscopic Measurement of Dry Film Thickness ofCoatings on Wood Products1This standard is issued under the fixed designation D5235;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year o
2、f last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of dry filmthickness of coatings applied to a smooth,textured or curvedrigid subs
3、trate of wood or a wood-based product1.2 This test method covers the preparation of wood orwood-based specimens for the purpose of microscopic mea-surement of dry film thickness.1.3 This test method suggests an analysis of dry filmthickness of coatings on wood or wood-based products using amicroscop
4、ic measurement.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-confo
5、rmancewith the standard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior t
6、o use.2.Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 dry film thickness or DFT,nthe thickness of dried,cured coating film on the substrate surface which may includeattached fibers but excludes free fibers that are encapsulated inthe layer itself.2.1.2 edge face,nthat part of t
7、he specimen that is a planeperpendicular to the surface showing a cross section of thecoating and substrate.2.1.3 soak in,nrefers to a coating on a porous(wood)where the coating does not lie essentially on the surface of thewood or wood-based product,but has penetrated into the fiberstructure of the
8、 wood or wood-based material.2.1.3.1 DiscussionWood or wood-based products are gen-erally of a porous nature;sometimes exhibiting uniformabsorption of coatings.Frequently absorption of coatings is ofa non-uniform nature and influenced by localized surfacedensity differences or wood pore size.These c
9、onditions ofcoating absorption are commonly referred to as soak in.3.Summary of Test Method3.1 A specimen of coated wood or wood-based product iscut to convenient size and edge face with the coating filmcross-section is prepared by polishing or cutting with a sharpblade.3.2 The prepared edge of the
10、specimen is imaged by acalibrated imaging system with known magnification in orderto measure the dry film thickness using an image analysiscomputer program.3.3 Suggestions regarding interpretation of dry film thick-ness on porous wood or wood-based material are offered.4.Significance and Use4.1 As a
11、 base for calibration adjustment or accuracy verifi-cation of dry film coating thickness measuring instruments.4.2 The dry film thickness of coatings on wood or wood-based products is specified in written product warranties forproper decorative and protective performance of coatings onwood or wood-b
12、ased products.4.3 The minimum and maximum dry film thickness ofcoatings is recommended by coating companies for satisfactorydecorative and protective performance on wood or wood-basedproducts.4.4 The average dry film thickness of coatings on wood orwood-based material may be used by manufacturing co
13、mpa-nies to estimate the theoretical cost of applied coatings.4.5 The ratio of minimum to maximum dry film thicknesson textured products is used as an indication of coatinguniformity.4.6 Specific coated product requirements may dictate cer-tain film thickness determinations to be made.Agreement1This
14、 test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.52 on Factory Coated Wood Products.Current edition approved Dec.1,2014.Published February 2015.Originallyapproved in 1992.Last prev
15、ious edition approved in 2013 as D5235 13.DOI:10.1520/D5235-14.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 between buyer and seller may be advisable to accommodateproduct needs relative to dry film thickness.5.Apparatus5.1 Microscope
16、with Attached Digital Camera(see Note 1),providing sufficient magnification and image quality in thefield of view;generally 100 to 200 magnification is suffi-cient.NOTE1Certain digital cameras can provided sufficient magnificationand image quality of the coating cross-section without a microscope.5.2 Source of Oblique Illumination,for the microscope.5.3 Image Analysis Program,with capabilities for lines tobe drawn along the coating/substrate interface and the coatingsurface and for calculation o
