ASTM_D_7257_-_06_2011.pdf

Designation:D725706(Reapproved 2011)Standard Test Method forAutomated Shelling Two-Piece Child-Resistant ClosuresThat Are Activated by Two Simultaneous DissimilarMotions1This standard is issued under the fixed designation D7257;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 measurement of the forcerequired to separate(or“shell”)the snap-fitted outer cap fromthe inner cap of Type IA,IB,or IC child-resistant closures.SeePractice D3475.1.2 This test method is an alternative to Test Method D3481,a manual test procedure.1.3 This test method does not measure the force required toseparate parts of a child-resistant closure system that wereoriginally“screwed-on”instead of“snapped-on”(for example,pull a cap over or through continuous or multi-start threadswhen the cap was originally screwed on).1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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 PackagesD3481 Test Method for Manual Shelling Two-Piece Child-Resistant Closures That Are Activated by Two Simultane-ous Dissimilar MotionsE105 Practice for Probability Sampling of MaterialsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or Process3.Terminology3.1 Definitions:3.1.1 shelling fixture or bracketa metal bracket that at-taches to a two-piece,child-resistant closure and pries an outercap from an inner cap.The bracket is shaped to simulate theprying action of a childs teeth.See Fig.1.3.1.2 drive cablea non-extensible cable attached from theshelling fixture to a tensile strength measuring device toprovide the cap shelling force.3.1.3 lifting notchindentation on the shelling fixture thatlifts the outer cap off the inner cap during the test.See detail Ain Fig.1.4.Summary of Test Method4.1 This test method measures the force required to pry theouter cap off the inner cap using a fixture having a contact pointunder the tip of the skirt of the outer cap and leverage beingplaced on that point and the top of the cap.This procedure isused where a pivotal prying force can be successfully used toseparate the components of the closure system,thereby dis-abling the child-resistant function.5.Significance and Use5.1 This test method of applying force may be used as astandard test to compare the characteristics of a given design ofcontainer/child-resistant closure system with a standard or tocompare the characteristics of container/child resistant closuresystems differing in construction.5.2 It may be used to simulate certain manipulations thatmay be expected to occur in protocol testing(such as,pryingwith the teeth,or objects in the room,biting,and pulling withthe teeth).5.3 This test may be used to establish performance specifi-cations.Shelling force may vary with cap application torque,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 Aug.1,2011.Published November 2011.Originallyapproved in 2006.Last previous edition approved in 2006 as D7257 06.DOI:10.1520/D7257-06R11.2For 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 FIG.1 Shelling BracketD7257 06(2011)2 bottle design,and other factors.Consequently where precisecomparative results are desired,these factors must be carefullycontrolled.6.Apparatus6.1 Testing MachineA testing machine of the constant-rate-of-crosshead-movement with vertical orientation type andcomprising essentially the following:6.1.1 Fixed MemberA fixed or essentially stationary gripcapable of holding a suitable bottle finish for the cap to betested.The fixed grip should be the lower grip.6.1.2 Movable MemberAmovable,top member carrying asecond grip.6.1.3 GripA grip for holding the shelling bracket cablecan be either the fixed or self-aligning type.6.2 A