1、Designation:D68522Standard Practice forConditioning Paper and Paper Products for Testing1This standard is issued under the fixed designation D685;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in p
2、arentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice defines the standard atmospheres fornormal preconditioning,conditioning,and testing of paper andpaper products,paperboard,fiberboard,an
3、d containers madefrom them.It also specifies procedures for handling thesematerials in order that they may reach equilibrium with therespective atmosphere.1.2 This practice does not include special conditioning andtesting atmospheres,such as those that attempt to simulatetropical or arctic environme
4、nts.1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.
5、1.4 This international standard was developed 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
6、Trade(TBT)Committee.2.Referenced Documents2.1 ISO Standards:2ISO 187 Paper,Board and PulpsStandard Atmosphere forConditioning and Testing and Procedure for Monitoringthe Atmosphere and Conditioning of Samples2.2 TAPPI Standard:3TAPPI T400 Sampling and Acceptance of a Single Lot ofPaper,Paperboard,Co
7、ntainerboard or Related ProductTAPPI/ANSI T402 Standard Conditioning and Testing At-mosphere for Paper,Board,Pulp Handsheets and RelatedProducts3.Significance and Use3.1 The preconditioning requirement is important becausephysical properties of a sample at 50%relative humiditydepend upon whether the
8、 sample is brought to 50%from ahigher or lower relative humidity.A detailed discussion of theimportance of preconditioning may be found in Annex A1.3.2 The conditioning and testing atmospheres are importantbecause both temperature and relative humidity have signifi-cant effects on the physical prope
9、rties of paper and board.Amore detailed discussion of the importance may be found inAnnex A2.3.3 This standard is technically identical to TAPPI T402.4.Standard Atmospheres4.1 Preconditioning Atmosphere10 to 35%relative hu-midity and 22 to 40 C(see Annex A1 and Annex A2).4.2 Conditioning Atmosphere5
10、0.0 6 2.0%relative hu-midity and 23.0 6 1.0 C.4.3 Testing AtmosphereSame as 4.2.NOTE1Average values must fall within these limits.Momentaryfluctuations and measurement limitations may cause individual measure-ments to vary up to+2 C(+3.6 F)and+5%relative humidity withoutsignificant impairment of tes
11、t precision.5.Apparatus5.1 Preconditioning ChamberA room or cabinet in whichsample sheets or specimens may be individually exposed tocirculating air at the preconditioning relative humidity andtemperature.NOTE2For smaller sheets or specimens,the required preconditioningmay be achieved easily with a
12、simple cabinet,if no other means areavailable.If this cabinet is operated in a room maintained at 50%relativehumidity and 23 C and so designed that room air is drawn through it,andif the air entering and in the cabinet is heated to a temperature of 39 61 C,the relative humidity in the cabinet will b
13、e in the required range(thatis,20 6 3%relative humidity).Commercially available forced-ventilation“ovens”should prove satisfactory.Input air to the oven shouldbe drawn from the standard room;output should be vented outside of thestandard room.5.1.1 For many papers and boards,approximately the samepr
14、econditioning moisture content obtained by the above pro-cedure may be achieved by using a sealed cabinet operated in1This practice is under the jurisdiction of ASTM Committee D10 on Packagingand is the direct responsibility of Subcommittee D10.21 on Shipping Containers andSystems-Application of Per
15、formance Test Methods.Current edition approved April 15,2022.Published May 2022.Originallyapproved in 1942.Last previous edition approved in 2017 as D685 17.DOI:10.1520/D0685-22.2Available from American National Standards Institute(ANSI),25 W43rd St,4th Floor,New York,New York 10036,http:/www.ansi.o
16、rg.3Available from Technical Association of the Pulp and Paper Industry(TAPPI)15 Technology Parkway South,Norcross GA 30092,http:/www.tappi.org.*A Summary of Changes section appears at the end of this standardCopyright 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 Principles for theDevelopment of I
