1、Designation:D380801(Reapproved 2021)Standard Test Method forQualitative Determination of Adhesion of Adhesives toSubstrates by Spot Adhesion1This standard is issued under the fixed designation D3808;the number immediately following the designation indicates the year oforiginal adoption or,in the cas
2、e of revision,the year 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 a simple qualitative procedurefor quickly screening whether an adhesive w
3、ill,under recom-mended application conditions,bond to a given substratewithout actually making bonded assemblies.1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.1.3 This standard does not purport to address all of thesafety conce
4、rns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with intern
5、ationally 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 Documents2.1 ASTM Standards:2D907 Termi
6、nology of AdhesivesE171 Practice for Conditioning and Testing Flexible BarrierPackaging3.Terminology3.1 DefinitionsMany of the terms used in this test methodare defined in Terminology D907.3.1.1 spot adhesion,na qualitative method of determiningadhesion by attempting to pry a“spot”of cured adhesive
7、froma substrate.4.Summary of Test Method4.1 Spots of adhesive(size can vary,but generally about 6mm(14in.)in diameter)are placed onto a substrate using theapplication procedure and curing conditions acceptable to bothuser and supplier of the adhesive.4.2 The substrate preparation and environmental e
8、xposureof the spot of adhesive after cure or setting can be varied asdesired.4.3 The determination of whether an adhesive bonds to thesubstrate is made by simply trying to pry the spot of adhesivefrom the substrate.4.4 The mode of failure is readily evident by examiningwhether the bond separated adh
9、esively or cohesively,either inthe adhesive or substrate.5.Significance and Use5.1 This is a quick,simple,and inexpensive test method forqualitatively determining,without the need to prepare bondedtest specimens,whether the adhesive under consideration willbond to a particular substrate.If the resul
10、ts are acceptable,thenstandard quantitative adhesive test procedures can be used toobtain quantitative measurements of the adhesives perfor-mance.5.2 This test method can also be used to compare relativeadhesion of several adhesives to given substrates.5.3 It can be used to determine whether an adhe
11、sive willcontinue to adhere to the substrate under specified environmen-tal conditions.5.4 It can be used to evaluate adhesion of a particularadhesive to a variety of substrates.5.5 It can be used to obtain“subjective”comparative databetween several adhesives on a given substrate by noting therelati
12、ve ease of inducing failure between the adhesives tested.5.6 It should be most applicable to adhesives that cure or setwhen exposed to“air”(ambient,heated,etc.)and could beused for anaerobic adhesives if testing is carried out in anoxygen-free atmosphere.6.Apparatus6.1 No special equipment is needed
13、 for application of theadhesive to the test substrate(s).When using hot-melt1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.40 on Adhesives forPlastics.Current edition approved April 1,2021.Published April 2021.Origin
14、allyapproved in 1979.Last previous edition approved in 2013 as D3808 01(2013).DOI:10.1520/D3808-01R21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Docum
15、ent Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Princip
16、les for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1adhesives,for example,it would be desirable to have ahand-gun applicator or equivalent apparatus to allow deposi-tion of the hot-melt at a recommended application temperature.The use of such equipment is not mandatory as a hot plate canbe used to melt a quantity of the hot melt to the applicationtemperature in a deformable container such a