1、Designation:D433518Standard Practice forDetermination of Component Retention of a MechanicalPump Dispenser1This standard is issued under the fixed designation D4335;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.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 the evaluation of the force requiredto remove the hood and the actuator from a mechanicaldispensing pump.1.2 T
3、his 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.1.3 This
4、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 Trade(TBT
5、)Committee.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for Testing3.Significance and Use3.1 This practice may be used to establish performancespecifications.3.2 This practice may be used to establish quality controlassessment.4.Apparatus4.1 Test StandThe test ap
6、paratus shall be capable ofapplying a smoothly increasing load to the test specimen untilthe component is separated from the pump assembly.NOTE1The condition of 4.1 is fulfilled by most motor driven tensilestrength testers including constant rate of elongation testers.NOTE2The test standard should b
7、e equipped with a maximum-forceindicator.4.2 Fixtures,to hold the mechanical pump dispenser.4.2.1 The fixtures must allow no slippage between the testspecimen and the fixture,so that distortion is avoided.4.2.2 The fixtures for the test apparatus may be custom-made for this test.5.Sampling5.1 Select
8、 an appropriate number of dry,unused pumpdispensers at random for precision and accuracy desired.Useof 10 test specimens is recommended,but a minimum of threeis acceptable.6.Test Specimen6.1 Test specimens shall be clean,dry,and previouslyunused mechanical pump dispensers assembled in the samemanner
9、 as in production.7.Conditioning7.1 If possible,condition the test specimens at 23 6 3C(736 5.4F)for not less than 4 h.If the test specimens are notconditioned at the recommended temperature,this should benoted in the test report(see 9.1).8.Procedure8.1 Attach fixtures to the test stand in accordanc
10、e with themanufacturers instructions or in a manner consistent with thepumps geometry.8.2 Adjust the test stand so that there is no force acting onthe specimen.NOTE3At this time,there should be a zero reading on the force gage.8.3 Manual Method:8.3.1 Place the pump assembly into the fixture.8.3.2 Gr
11、asp the component to be separated in the hand.8.3.3 Pull the component as slowly as possible,avoidingquick,jerking actions.8.3.4 Continue to pull the component until it separates fromthe assembly.8.3.5 Observe and record the maximum force,N(lb),required to separate the component from the assembly.1T
12、his practice is under the jurisdiction of ASTM Committee F02 on PrimaryBarrier Packaging and is the direct responsibility of Subcommittee F02.30 onMechanical Dispensers.Current edition approved May 1,2018.Published June 2018.Originallyapproved in 1984.Last previous edition approved in 2010 as D4335
13、99(2010).DOI:10.1520/D4335-18.2For 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 website.Copyright ASTM International,100 Bar
14、r 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 Recommendat
15、ions issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 8.4 Machine Method:8.4.1 Place the pump assembly into the fixture.8.4.2 Secure the other component to the movable crosshead.8.4.3 Operate the test stand at a rate of 250 mm/min(10in./min).8.4.4 Stop the machine w
16、hen the component has separatedfrom the assembly.8.4.5 Observe and record the maximum force,N(lb),required to separate the component from the assembly.9.Report9.1 The report shall include the following:9.1.1 Complete identification of the component tested,in-cluding materials of construction,size,and manufacturerscode and date of manufacture,if known,9.1.2 Number of specimens tested,9.1.3 Number of test specimens that were separated fromthe assembly,9.1.4 Mean,minimum,maximum,and standard deviat
