1、Designation:C176316Standard Test Method forWater Absorption by Immersion of Thermal InsulationMaterials1This standard is issued under the fixed designation C1763;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.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 determines the amount of water re-tained(excluding surface water)by flat specimens of thermalinsulations after these
3、materials have been fully immersed inliquid water for a prescribed time interval under isothermalconditions.This test method is intended to be used for thecharacterization of materials in the laboratory.It is not intendedto simulate any particular environmental condition potentiallyencountered in bu
4、ilding construction applications.1.2 This test method does not address all the possiblemechanisms of water intake and retention and related phenom-ena for thermal insulations.It relates only to those conditionsoutlined in 1.1.Determination of moisture accumulation inthermal insulations due to partia
5、l immersion,water vaportransmission,internal condensation,freeze-thaw cycling,or acombination of these effects requires different test procedures.1.3 This test method does not address or attempt to quantifythe drainage characteristics of materials.1.4 The values stated in either SI units or inch-pou
6、nd 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-conformancewith the standard.1.5 This standard does not purport to addre
7、ss 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.2.Material And Specimen Characteristics that canInfluence Res
8、ults2.1 The apparent water absorption measured by this testmethod is dependent on the surface to volume ratio of thesample and time of immersion.As such,comparisons betweenProcedures A,B,and,C cannot be made.Cracks in thespecimens and rough surfaces can increase the apparent waterabsorption.2.2 Some
9、 materials tend to collect water on surfaces or totrap water in corners and,if not removed,will give incorrectresults.2.3 Materials that change or react with water can haveincreased(or decreased)apparent water absorption and are notsuitable for use with this method.13.5.1 provides a method forensuri
10、ng the specimen has not been physically or chemicallyaltered in a way that would invalidate the measurement.Usethis method in cases of dispute.3.Referenced Documents3.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC303 Test Method for Dimensions and Density of Pre-formed Block and
11、BoardType Thermal InsulationC870 Practice for Conditioning of Thermal Insulating Ma-terialsC1134 Test Method for Water Retention of Rigid ThermalInsulations Following Partial ImmersionE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlabora
12、tory Study toDetermine the Precision of a Test Method4.Terminology4.1 DefinitionsTerminology C168 applies to terms used inthis test method.5.Summary of Test Method5.1 Test specimens are conditioned and then immersed inwater for a prescribed amount of time.The amount of waterabsorbed is determined by
13、 the weight increase in the speci-mens.1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.33 on InsulationFinishes and Moisture.Current edition approved March 1,2016.Published July 2016.Originallyapproved in 2014
14、.Last previous edition approved in 2014 as C1763 14.DOI:10.1520/C1763-16.2For 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 Document Summary page onthe ASTM w
15、ebsite.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Significance and Use6.1 This test method provides a means of measuring thewater absorption of flat specimens of thermal insulationmaterials under isothermal conditions as a result o
16、f directimmersion in liquid water.It is intended for quality control andproduct and material specifications.6.2 The procedure to be used:A,B,or C as well as anyexceptions shall be noted in material specifications citing thistest method.6.3 Repeatability has been established only for one type andsize of material at one immersion duration.NOTE1Specifications referring to this test method are encouraged toestablish repeatability for specific materials,immersion duration,anddimensions for inclusion
