ASTM_D_3470_-_97_2007.pdf

Designation:D347097(Reapproved 2007)Standard Test Method forMeasurement of Removal Lug Strippage of Type IIA Child-Resistant Closures1This standard is issued under the fixed designation D3470;the number immediately following the designation indicates the year oforiginal adoption or,in 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 covers the determination of the forcerequired to cause a downward-force-while-turning lug-finishclosure to be rotated across the container finish lugs(strippage)without downward force being applied to the closure(Type IIAclosures).1.2 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D3474 Practice for Calibration and Use of Torque MetersUsed in Packaging ApplicationsD3475 Classification of Child-Resistant Packages3.Terminology3.1 Definitions:3.1.1 type IIA child-resistant closurea lug finish closurerequiring a random push down while turning.(See Classifica-tion D3475.)3.2 Definitions of Terms Specific to This Standard:3.2.1 strippage torquethe moment of force which is re-quired to produce rotation of the closure over the container lugswhile exerting no downward force.4.Summary of Test Method4.1 This test method consists of securing a capped container(after suitable preconditioning)in a torque-measuring deviceand rotating the closure,using mechanical or nonmechanicalaid,to determine the torque needed to rotate the closure acrossthe container lugs.No downward force is applied.4.2 Using sufficient sampling,the average strippage forceand the range are determined for a given lot of samples.Torquemeasurements are in units of pound-force-inch or newton-metre.5.Significance and Use5.1 This test method may be used as a standard test in thecomparison of a given size and design lug-style child-resistantclosure to manufacturer specifications,and in the comparisonof similar closures of differing materials for determiningstrippage.5.2 This test method may be used as a standard test toevaluate the continued effectiveness of the closure for childresistance and adult opening and reclosing throughout theexpected use and shelf life of the package.6.Apparatus6.1 Torque-Measuring Device,(see Note 1)having a mea-surement range consistent with the torque values to bemeasured,that will securely hold the capped container.NOTE1Adigital or automated torque instrument,if used,will have anappropriate design and scale capacity for the container/closure system tobe evaluated.Torque results will be available in either electronic displayor printout formats.6.2 Gripping Device(Optional),that will effectively gripthe closure perpendicular to the vertical axis of the containerwithout the use of vertical or radial forces,and that will notcontact any portion of the container(Fig.1).7.Sampling7.1 Randomly select sufficient samples to ensure reproduc-ibility of results from the lot being inspected.8.Test Specimens8.1 Examine closure samples and containers,to be vehiclesfor this test,to determine compliance with the manufacturersdimensional and material specifications.8.2 Prepare test specimens by assembling the closure to theappropriate container by pressing downward and turning theclosure so as to reduce or eliminate initial closure lug wear.1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommittee D10.32 on Consumer,Pharmaceutical,Medical,and Child Resistant Packaging.Current edition approved Oct.1,2007.Published October 2007.Originallyapproved in 1976.Last previous edition approved in 2002 as D3470 97(2002).DOI:10.1520/D3470-97R07.2For 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 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 9.Calibration9.1 Calibrate the torque meter in accordance with PracticeD3474.10.Conditioning10.1 If special conditions are not required,store the unas-sembled specimens for a minimum of 24 h at 23 6 2C and at50 6 5%relative humidity.10.2 The atmosphere conditions in Table 1 may be usedwhen special conditioning is appropriate.Other atmosphereconditions may also be used as appropriate.10.3 The time of assembly and duration and range ofconditioning will relate to the purpose of the test as outlined inSection 3.11.Procedure11.1 Position each closure-container specimen and clamp itin the torque-measuring device,ensuring that the rotationalaxis of t