1、Designation: D4335 99 (Reapproved 2010)Standard Test Method 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 revi
2、sion, the 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 test method covers the evaluation of the forcerequired to remove the hood and the actuator from
3、 a mechani-cal dispensing pump.1.2 This standard may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user of this standard toconsult and establish appropriate
4、 safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for Testing3. Significance and Use3.1 This test method may be used to establish performancespecifications.3.2 This test
5、 method may be used to establish qualitycontrol assessment.4. Apparatus4.1 Test StandThe test apparatus shall be capable ofapplying a smoothly increasing load to the test specimen untilthe component is separated from the pump assembly.NOTE 1The condition of 4.1 is fulfilled by most motor driven tens
6、ilestrength testers including constant rate of elongation testers.NOTE 2The test standard should be 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 avo
7、ided.4.2.2 The fixtures for the test apparatus may be custom-made for this test.5. Sampling5.1 Select 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
8、 specimens shall be clean, dry, and previouslyunused mechanical pump dispensers assembled in the samemanner 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 temperatu
9、re, this should benoted in the test report (see 9.1).8. Procedure8.1 Attach fixtures to the test stand in accordance 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.NOTE 3At this time, there
10、 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 Grasp 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 fr
11、omthe assembly.8.3.5 Observe and record the maximum force, N (lb),required to separate the component from the assembly.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.1This test method is under the jurisdiction of ASTM Commi
12、tteeD10 onPackaging and is the direct responsibility of Subcommittee D10.33 on MechanicalDispensers.Current edition approved Oct. 1, 2010. Published March 2011. Originallyapproved in 1984. Last previous edition approved in 2006 as D4335 99 (2006).DOI: 10.1520/D4335-99R10.2For referenced ASTM standar
13、ds, 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
14、19428-2959, United States.8.4.3 Operate the test stand at a rate of 250 mm/min (10in./min).8.4.4 Stop the machine when 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 in
15、clude 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, max
16、imum, and standard deviation offorces required to separate the components from the assembly,9.1.5 Special storage conditions, if applicable,9.1.6 Description of the test apparatus, and9.1.7 Method used, whether manual or machine (see 8.3 and8.4).10. Precision and Bias10.1 PrecisionThe precision of T
17、est Method D4335 ishighly dependent on the interference requirements of theparticular pump components tested. One laboratory has inves-tigated one particular pump actuator removed from one par-ticular pump piston with 82 replicate tests, yielding an averageof 6.24 lbf with a range of 9.0 to 4.6 lbf
18、and a standarddeviation of 0.95 lbf. Other pump component assemblies willhave other averages of retention and will have more or lessvariability between replicate tests. Users of this test method areencouraged to reference historical files of previous tests ofsimilar pump component assemblies for an
19、estimate of within-laboratory repeatability. Due to this varying component inter-ference requirement dependency, further investigation of re-peatability and reproducibility is not practicable.10.2 BiasTest Method D4335 has no bias because anaccepted reference or referee value is not available.11. Ke
20、ywords11.1 component; mechanical pump dispenser; retentionASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such pate
21、nt rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited eith
22、er for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair h
23、earing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standa
24、rd may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D4335 99 (2010)2
