1、Designation:D842221Standard Practice forPre-Stressing Terminal Point-of-Use Water Filters beforeTesting by Test Method F8381This standard is issued under the fixed designation D8422;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the
2、 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 practice covers terminal point-of-use(POU)filtersintended for intermittent use on showers,faucets,and otherwa
3、ter use end-point devices that deliver hot and cold potablewater.1.2 This practice does not cover in-line filters.1.3 UnitsThe values stated in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only
4、 and 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 of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulat
5、ory limitations prior to use.1.5 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 Organ
6、ization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterF838 Test Method for Determining Bacterial Retention ofMembrane Filters Utilized for Liquid Filtration2.2 ISO Standards:3ISO 13485 Medica
7、l devices Quality management systems Requirements for regulatory purposes3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 in-line water filter,ndevice installed on the watersupply line
8、 upstream of a water use end point,such as ashower,faucet,or ice machine,for the purpose of removingcontaminants from the water before the water enters the wateruse end point.3.2.2 terminal point-of-use water filter,ndevice installedat the point where water exits a water use end point,such as ashowe
9、r or faucet,for the purpose of removing contaminantsfrom the water before the water exits the water use end point.4.Summary of Practice4.1 This protocol has two parts,PartA,described in 7.1 andPart B,described in 7.2.Two variations of this protocol may beimplemented:Part A(alone)or both Part A and P
10、art B.Whenboth Part A and Part B are implemented:for each filter tested,Part A shall be implemented first followed by Part B.For bothParts A and B,cycles shall be run consecutively and continu-ously.Up to 72 h pause is acceptable between cycle sets.4.2 Part A is a series of cycles that alternate the
11、 flow of coldand hot water.A set of ten hot water-cold water flow pairsunder Part A conditions shall be considered the equivalent ofone filter-use day.Part B is a series of cycles that alternate theflow of cold and hot water.A set of two hot water-cold waterflow pairs under Part B conditions shall b
12、e considered theequivalent of one filter-use day.Test requirements for Parts Aand B shall be the same except where specifically provided.4.3 When only Part A is implemented and compliance withthis practice is referenced by the vendor of the terminalpoint-of-use water filter(“device”)tested,the refer
13、ence shallstate:“This device has been tested under Part A of ASTMPractice D8422,which includes testing only to water tempera-tures up to 125F(51.7C);it has not been tested under Part Bof ASTM Practice D8422,which includes testing to watertemperatures greater than 125F(51.7C).This device shouldnot be
14、 used in any application where the water temperature1This practice is under the jurisdiction of ASTM Committee D19 on Water andis the direct responsibility of Subcommittee D19.08 on Membranes and IonExchange Materials.Current edition approved Nov.1,2021.Published January 2022.DOI:10.1520/D8422-21.2F
15、or 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 website.3Available from American National Standards Institute(ANSI),25 W.43r
16、d St.,4th Floor,New York,NY 10036,http:/www.ansi.org.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 Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1may exceed 125F(51.7C),e
