1、Designation: D 4335 99 (Reapproved 2006)Standard Test Method forDetermination of Component Retention of a MechanicalPump Dispenser1This standard is issued under the fixed designation D 4335; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 f
3、rom 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 appropri
4、ate safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2D 618 Practice for Conditioning Plastics for Testing3. Significance and Use3.1 This test method may be used to establish performancespecifications.3.2 This
5、test 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
6、tensilestrength 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
7、 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 pumpdispensers at random for precision and accuracy desired. Useof 10 test specimens is recommended, but a minimum of threeis acceptable.6. Test Specimen6.1
8、Test 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 tempe
9、rature, 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, t
10、here 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 separate
11、s fromthe 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.1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility
12、of Subcommittee D10.33 on MechanicalDispensers.Current edition approved July 15, 2006. Published July 2006. Originallyapproved in 1984. Last previous edition approved in 1999 as D 4335 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service
13、astm.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 19428-2959, United States.8.4.2 Secure the other component to the movable crosshead.
14、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 include the following:9.1.1
15、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 deviati
16、on 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 Test Method D 4335 ishighly
17、 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 and a standarddeviation o
18、f 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 estimate of within-labora
19、tory repeatability. Due to this varying component inter-ference requirement dependency, further investigation of re-peatability and reproducibility is not practicable.10.2 BiasTest Method D 4335 has no bias because anaccepted reference or referee value is not available.11. Keywords11.1 component; me
20、chanical 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 patent rights, and the risko
21、f 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 either for revision of this
22、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 hearing you shouldmake yo
23、ur 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 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).D 4335 99 (2006)2
