1、Designation:C144214Standard Practice forConducting Tests on Sealants Using Artificial WeatheringApparatus1This standard is issued under the fixed designation C1442;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.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 practice covers three types of laboratory weather-ing exposure procedures for evaluating the effect of actinicradiation,heat,an
3、d moisture on sealants.1.2 The exposure sources used in the three types of artificialweathering devices are the filtered xenon arc,fluorescentultraviolet lamps,and open flame carbon arc based on PracticesG155,G154,and G152,respectively.1.3 The values stated in SI units are to be regarded as thestand
4、ard.The values given in parentheses are provided forinformation only.1.4 The ISO standard related to this Practice is ISO 11431.Significant differences exist between the procedures.The ISOspecimens are exposed through glass and are elongated prior toexamination for loss of adhesion or cohesion,or bo
5、th,follow-ing exposure.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to
6、 use.2.Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testingof Nonmetallic MaterialsG147 Practice for Conditioning
7、and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG152 Practice for Operating Open Flame Carbon Arc LightApparatus for Exposure of Nonmetallic MaterialsG154 P
8、ractice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmetallic MaterialsG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic Materials2.2 ISO Standard:ISO 11431 Building ConstructionSealants:Determinationof Adhesion/Cohesion Properties After
9、Exposure to Heatand Artificial Light Through Glass and to Moisture33.Terminology3.1 DefinitionsDefinitions of the following terms arefound in Terminology C717:standard conditions,compound,cure,sealant,substrate.Definitions of the following terms arefound in Terminology G113:actinic radiation,control
10、material,file specimen,fluorescent ultraviolet lamps,irradiance,open flame carbon arc,radiant exposure,sample,solar radiation-ultraviolet,solar radiation-visible,spectralpower distribution,xenon arc.4.Summary of Practice4.1 The test sealant may be applied to a variety of types ofsubstrates or tested
11、 as a free film.The configuration depends onthe properties to be evaluated following exposure.At least fourreplicates of each sealant being tested are required.Aftercuring,one replicate of each sealant being tested is retained asan unexposed file specimen and three replicates are exposed toactinic r
12、adiation,heat,and moisture.At the end of the exposureperiod,the test sealant is examined for property change incomparison with the unexposed file specimen and the perfor-mance is compared with that of an exposed control material,ifused.4.2 It is recommended that a similar material of knownperformanc
13、e under use conditions(a control)be exposedsimultaneously with the test specimen for evaluation of theperformance of the test materials relative to that of the control1This practice is under the jurisdiction of ASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subc
14、ommittee C24.40 onWeathering.Current edition approved July 15,2014.Published August 2014.Originallyapproved in 1999.Last previous edition approved in 2011 as C1442 11.DOI:10.1520/C1442-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceast
15、m.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshoho
16、cken,PA 19428-2959.United States1 under the same laboratory exposure conditions.It is preferableto use two control materials,one with relatively poor durabilityand the other with good durability.5.Significance and Use5.1 This practice determines the effects of actinic radiation,elevated temperature,and moisture on sealants and theirconstituents under controlled laboratory artificial weather testconditions.5.2 When conducting exposures in devices which use labo-ratory light sources,it is importan