ASTM D7257

This test method of applying force may be used as a standard test to compare the characteristics of a given design of container/child-resistant closure system with a standard or to compare the characteristics of container/child resistant closure systems differing in construction.

It may be used to simulate certain manipulations that may be expected to occur in protocol testing (such as, prying with the teeth, or objects in the room, biting, and pulling with the teeth).

This test may be used to establish performance specifications. Shelling force may vary with cap application torque, bottle design, and other factors. Consequently where precise comparative results are desired, these factors must be carefully controlled.

1. Scope

1.1 This test method covers the measurement of the force required to separate (or "shell") the snap-fitted outer cap from the inner cap of Type IA, IB, or IC child-resistant closures. See Practice D 3475.

1.2 This test method is an alternative to Test Method D 3481, a manual test procedure.

1.3 This test method does not measure the force required to separate parts of a child-resistant closure system that were originally "screwed-on" instead of "snapped-on" (for example, pull a cap over or through continuous or multi-start threads when the cap was originally screwed on).

1.4 The values stated in inch-pound (lbf) units are to be regarded as standard.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

D3474 Practice for Calibration and Use of Torque Meters Used in Packaging Applications
D3475 Classification of Child-Resistant Packages
D3481 Test Method for Manual Shelling Two-Piece Child-Resistant Closures That Are Activated by Two Simultaneous Dissimilar Motions
E105 Practice for Probability Sampling Of Materials
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process

Index Terms

shelling; two simultaneous dissimilar motions; Type IA child-resistant closure; Type IB child-resistant closure; Type IC child-resistant closure; ICS Number Code 43.040.80

Citing ASTM Standards

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