ASTM D3472 - 97(2007)

    Standard Test Method for Reverse-Ratchet Torque of Type IA Child-Resistant Closures

    Active Standard ASTM D3472 | Developed by Subcommittee: D10.32

    Book of Standards Volume: 15.10


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    Significance and Use

    These torque measurements are of value because the reverse-ratchet torque is a torque applied to the closure in the removal direction of the closure. For Type IA closures, it is essential that this torque be significantly lower than some defined level at which the closure might unscrew.

    This test may be used to establish performance specification for this attribute.

    1. Scope

    1.1 This test method covers the measurement of the torque developed when Type IA child-resistant closures are rotated in the counter-clockwise direction. Type IA closures are reclosable continuous threaded closures that use a random push down while turning; no orientation of the push down force is necessary.

    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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D3198 Test Method for Application and Removal Torque of Threaded or Lug-Style Closures

    D3474 Practice for Calibration and Use of Torque Meters Used in Packaging Applications

    D3475 Classification of Child-Resistant Packages

    D3810 Test Method for Minimum Application Torque of Type IA Child-Resistant Closures

    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


    ICS Code

    ICS Number Code 55.020 (Packaging and distibution of goods in general)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D3472-97R07

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