1、Designation: D4335 99 (Reapproved 2010)D4335 18Standard Test Method 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
2、 the case of revision, 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 practice covers the evaluation of the force required to remove the
3、 hood and the actuator from a mechanicaldispensing pump.1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address allof the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to consult
4、 and establishappropriate safety safety, health, and healthenvironmental practices and determine the applicability of regulatory limitations priorto use.1.3 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decisio
5、n on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for Testing3. Significance and Use3.1 This t
6、est method practice may be used to establish performance specifications.3.2 This test method practice may be used to establish quality control assessment.4. Apparatus4.1 Test StandThe test apparatus shall be capable of applying a smoothly increasing load to the test specimen until thecomponent is se
7、parated from the pump assembly.NOTE 1The condition of 4.1 is fulfilled by most motor driven tensile strength testers including constant rate of elongation testers.NOTE 2The test standard should be equipped with a maximum-force indicator.4.2 Fixtures, to hold the mechanical pump dispenser.4.2.1 The f
8、ixtures must allow no slippage between the test specimen 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 an appropriate number of dry, unused pump dispensers at random for precision and accuracy desired.
9、Use of 10 testspecimens is recommended, but a minimum of three is acceptable.6. Test Specimen6.1 Test specimens shall be clean, dry, and previously unused mechanical pump dispensers assembled in the same manner asin production.1 This test method practice is under the jurisdiction ofASTM Committee F0
10、2 on FlexiblePrimary Barrier Packaging and is the direct responsibility of Subcommittee F02.30on Mechanical Pump Dispensers.Current edition approved Oct. 1, 2010May 1, 2018. Published March 2011June 2018. Originally approved in 1984. Last previous edition approved in 20062010 asD4335 99 (2006). (201
11、0). DOI: 10.1520/D4335-99R10.10.1520/D4335-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document i
12、s not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as approp
13、riate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17. Conditioning7.1 If possible, condition the test specimens at
14、 23 6 3C (73 6 5.4F) for not less than 4 h. If the test specimens are notconditioned at the recommended temperature, this should be noted in the test report (see 9.1).8. Procedure8.1 Attach fixtures to the test stand in accordance with the manufacturers instructions or in a manner consistent with th
15、e pumpsgeometry.8.2 Adjust the test stand so that there is no force acting on the specimen.NOTE 3At 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 Grasp the component to be separated in the hand.8.3.3 Pull the compon
16、ent as slowly as possible, avoiding quick, jerking actions.8.3.4 Continue to pull the component until it separates from the 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 fixt
17、ure.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 (10 in./min).8.4.4 Stop the machine when the component has separated from the assembly.8.4.5 Observe and record the maximum force, N (lb), required to separate the component from the as
18、sembly.9. Report9.1 The report shall include the following:9.1.1 Complete identification of the component tested, including materials of construction, size, and manufacturers code anddate of manufacture, if known,9.1.2 Number of specimens tested,9.1.3 Number of test specimens that were separated fro
19、m the assembly,9.1.4 Mean, minimum, maximum, and standard deviation of forces 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 and 8.4).10. Precision
20、 and Bias10.1 PrecisionThe precision of Test Method Practice D4335 is highly dependent on the interference requirements of theparticular pump components tested. One laboratory has investigated one particular pump actuator removed from one particularpump piston with 82 replicate tests, yielding an av
21、erage of 6.24 lbf with a range of 9.0 to 4.6 lbf and a standard deviation of 0.95lbf. Other pump component assemblies will have other averages of retention and will have more or less variability betweenreplicate tests. Users of this test method practice are encouraged to reference historical files o
22、f previous tests of similar pumpcomponent assemblies for an estimate of within-laboratory repeatability. Due to this varying component interference requirementdependency, further investigation of repeatability and reproducibility is not practicable.10.2 BiasTest Method Practice D4335 has no bias bec
23、ause an accepted reference or referee value is not available.D4335 18211. Keywords11.1 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 standa
24、rd are expressly advised that determination of the validity of any such patent 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
25、 not revised, either reapproved or withdrawn.Your comments are invited either 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, whic
26、h you may attend. If you feel that your comments have not received a fair hearing 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,Un
27、ited States. Individual reprints (single or multiple copies) of this standard 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 183
