1、Designation: D7519 11Standard Test Method forInternal Bond Strength and Thickness Swell of Cellulosic-Based Fiber and Particle Panels After Repeated Wetting1This standard is issued under the fixed designation D7519; the number immediately following the designation indicates the year oforiginal adopt
2、ion or, in the case 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 These test methods provide a measure of the moistureresistance of cellulo
3、sic-based fiber and particle panels (forexample, medium-density fiberboard (MDF), particleboard,and hardboard). Resistance to moisture changes is measured bydimensional and internal bond changes and does not refer todecay/mold resistance or other performance aspects.1.2 These test methods do not add
4、ress structural propertiesor performance following moisture exposure. Panels are sub-jected to repeated cycles of water submersion and oven drying.After three cycles, the test specimens are tested for thicknessswelling (TS) and internal bond (IB) strength.1.3 The values stated in inch-pound units ar
5、e to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility
6、 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.2. Referenced Documents2.1 ASTM Standards:2D1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel MaterialsD4442 Tes
7、t Methods for Direct Moisture Content Measure-ment of Wood and Wood-Base MaterialsD4933 Guide for Moisture Conditioning of Wood andWood-Based Materials3. Significance and Use3.1 These test methods provide a measure of the moistureresistance of cellulosic-based fiber and particle panels (forexample,
8、medium-density fiberboard (MDF), particleboard,and hardboard). This test methodology can be used to assessthe thickness swelling and bond integrity characteristics ofpanels engineered for interior end-use applications involvingexposure to cyclic temperatures and intermittent wetting envi-ronments.4.
9、 Apparatus4.1 The methods and test equipment used in Test MethodsD1037 are used in these test methods.5. Sampling and Test Specimens5.1 Two samples taken from the same board measuring 6 36 in. (152 3 152 mm) shall be used for collection of thicknessswelling (TS) data.5.2 Three internal bond (IB) str
10、ips measuring 6 3 12 in.(152 3 305 mm) shall be cut from the same board as the TSsamples.6. Conditioning6.1 Condition specimens to practical equilibrium at a rela-tive humidity of 65 6 3 % and a temperature of 68 6 4F (206 2C). Practical equilibrium is defined as the state of timechange in which, fo
11、r practical purposes, the specimen is neithergaining nor losing appreciable moisture content in a 24-hperiod. Guide D4933 provides further information on moistureequilibrium.7. Procedure7.1 Thickness Swell (TS)7.1.1 After conditioning, the mass of the specimen shall bemeasured to an accuracy of 60.2
12、 %. The width, length, andthickness of the specimen shall be measured to an accuracy of60.3 % to compute the volume of the specimen.7.1.2 The thickness shall be measured at four points mid-way along each side 1 in. (25 mm) away from the edge and theaverage of these four measurements shall be recorde
13、d as theinitial thickness for each specimen. The thickness shall bemeasured over a surface with14-in. diameter on both sides ofthe specimen using a micrometer with14-in. (6.4-mm) anvils.7.1.3 The specimens shall be submitted to three exposurecycles according to 7.2. The water soak tank parameters sh
14、allconform to the requirements of paragraph 23.5.1 of Test1This test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.03 on Panel Products.Current edition approved May 1, 2011. Published June 2011. DOI: 10.1520/D751911.2For referenced
15、 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 Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
16、hohocken, PA 19428-2959, United States.Methods D1037. For drying, a forced air drying oven shall beused with an adequate internal volume to allow TS specimensto dry without being dead stacked.7.1.4 After the third exposure cycle, remove excess waterfrom the specimens using a paper towel and measure
17、the finalthickness of each specimen at the four marked points midwayalong each side according to 7.1.2.7.1.5 After exposure, the specimens shall be dried in anoven at 217 6 4F (103 6 2C) to determine the moisturecontent in accordance with Test Methods D4442, Method B.7.2 Exposure CycleThe TS and IB
18、specimens shall besubmitted to the following exposure cycle three times.7.2.1 16 h 6 5 min oven drying at 158 6 2F (70 6 1C),7.2.2 Immediately followed bya3h6 5 min water soak at68 6 2F (20 6 1C),7.2.3 Immediately followed bya2h6 5 min oven dryingat 158 6 2F (70 6 1C), and7.2.4 Immediately followed
19、bya3h6 5 min water soak at68 6 2F (20 6 1C).7.2.5 If the exposure is to be interrupted, it shall besuspended following the 16-h oven-drying period in 7.2.1.Insuch a case, allow the specimens to cool to room temperaturein an environment that restricts changes of the specimensmoisture content.NOTE 1Wr
20、apping the specimens in polyethylene or using a desiccatorhave both been found satisfactory to minimize changes in moisturecontent.7.3 Internal Bond (IB)7.3.1 The IB strips shall be submitted to three exposurecycles according to 7.2.7.3.2 After the third exposure cycle, immediately place theIB strip
21、s into the oven for 16 h at 158 6 2F (70 6 1C).Following the 16 h of drying, allow the IB strip to cool to roomtemperature for at least 1 h and cut four IB blocks 2 3 2 in. (503 50 mm) from the center of each of the three IB strips. If theIB blocks surface is concave or convex, lightly sand until th
22、esurfaces are flat and parallel.7.3.3 Test the IB specimens in accordance with Test Meth-ods D1037, Section 11.8. Calculation8.1 The moisture content of TS specimens before and aftersubmersion shall be calculated based on oven-dry mass. Theamount of water absorbed by the specimen during the submer-s
23、ion shall be calculated from the increase in mass andexpressed as the percentage by volume and by mass based onthe volume and the mass, respectively, after conditioning.Assume the specific gravity of the water to be 1.00 for thispurpose.8.2 The TS shall be calculated as thickness after the thirdcycl
24、e minus the initial thickness expressed as a percentage ofthe initial thickness: TS = (final thickness initial thickness)/(initial thickness) * 100 %.8.3 The IB shall be calculated according to Paragraph 11.5.1of test methods D1037.9. Report9.1 The report shall include the following:9.1.1 Descriptio
25、n of test material (for example, type ofpanel, density, production information, source, and so forth)and details of the exposure procedure;9.1.2 The average moisture content of TS specimens beforeand after exposure;9.1.3 Initial and final panel thickness, and the average TS ofthe two specimens expre
26、ssed as a percentage;9.1.4 The average IB of the twelve specimens.NOTE 2It might be helpful to note in the report the location of the IBbreak in the thickness, for example, peeled at surface or middle third, topthird, or bottom third. Also note any pattern in test set up flaws or in anarea of weakne
27、ss in the product.10. Precision and Bias10.1 PrecisionSubcommittee D07.03 on panel products isin the process of developing a precision statement for thismethod.10.2 BiasNo bias statement is available for this testmethod because of the lack of an acceptable homogeneousreference material.11. Keywords1
28、1.1 cellulosic-based fiber and particle panels; internalbond; moisture resistance; thickness swellingASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that det
29、ermination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved o
30、r withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel th
31、at your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints
32、 (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D7519 112
