1、Designation:D279399(Reapproved 2017)Standard Test Method forBlock Resistance of Organic Coatings on Wood PanelSubstrates1This standard is issued under the fixed designation D2793;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar of 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 determination of the blockresistance of organic coatings on wood and wood-based panelsubs
3、trates.Block resistance is the ability of a coating to resiststicking to another surface and to resist any change inappearance when it is pressed against that surface for aprolonged period of time.1.2 General methods for determining block resistance areoutlined in Sections 6 and 7.Variations inheren
4、t in usermaterials and procedures,however,may dictate adjustments tothe general method to improve accuracy.Paragraphs 7.3 and7.4 provide guidelines for tailoring the general procedure to ausers specific application.Paragraph 7.5 offers a rating meth-odology.1.3 Test Method D2091 should be used for t
5、he determina-tion of print resistance or pressure mottling of organic coatings,particularly lacquers,applied to wood-based case goods suchas furniture.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 This standard does no
6、t 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 to use.1.6 This international standard was develop
7、ed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2
8、.1 ASTM Standards:2D2091 Test Method for Print Resistance of Lacquers3.Summary of Test Method3.1 The coatings are prepared for testing in a mannerduplicating production application and curing conditions asnearly as possible on the specified wood substrate.Then a stackof these painted substrates is f
9、ormed and subjected to aspecified pressure and temperature for a sufficient time todevelop any sticking tendencies that exist.The pressure isreleased and the painted surfaces are examined for any signs ofsticking or pressure mottling.If blocking(forming a block bypanels sticking together)occurs,the
10、material is unsatisfactory.If no sticking or damage to the film surface occurs,the materialis satisfactory.3.2 When the conditions of production finishing are estab-lished and known,the method of application,the substrate,filmthickness,and cure of the film should duplicate these condi-tions as close
11、ly as possible.However,some acceleration of thetest may be possible with more severe conditions.4.Significance and Use4.1 Coated wood panel products must be stacked face toface or face to back during warehousing,packaging,andtransportation without the coated finish sticking(blocking)andbecoming dama
12、ged.This test method describes a laboratorymeans of evaluating conditions of blocking using factors ofpressure,heat,time and moisture.4.2 Degrees of hardness or degrees of cure of organiccoatings,or both,can be evaluated using a blocking test.4.3 The rate of volatile loss(drying speed)of organiccoat
13、ings can be evaluated using a blocking test.4.4 The effectiveness of protective packaging materials(slipsheets)for organic coatings on wood substrates can be evalu-ated using a blocking test.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and
14、Applications and is the direct responsibility ofSubcommittee D01.52 on Factory Coated Wood Products.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1969.Last previous edition approved in 2011 as D2793 99(2011).DOI:10.1520/D2793-99R17.2For referenced ASTM standards,visi
15、t the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United
16、 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.Apparatus5.1 Hydraulic Press(preferably constant pressure),capableof maintaining the agreed upon stacking pressure.5.2 Rigid Platens,at least 4 in.(100 mm)square,capable ofbei