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ASTM D 3472-97 (2002) Standard test method for reverse-ratchet torque of type 1A child-resistant closures

Measuring the reverse-ratchet torque on type 1A child-resistant closures

NOTE: Withdrawn standard, no replacement (January 2016)

This ASTM test method measures the torque developed when type 1A child-resistant closures are rotated counter-clockwise. Type 1A closures are reclosable continuous threaded containers that use a random push down while turning: no orientation of the push down force is necessary

This ASTM test method measures the torque developed when type 1A child-resistant closures are rotated counter-clockwise. Type 1A closures are reclosable continuous threaded containers that use a random push down while turning: no orientation of the push down force is necessary

A calibrated torque meter capable of indicating clockwise and counter-clockwise torque. The meter should have a means of securely holding the container without distortion.

Separate, unused containers and closures are sampled in accordance with established statistical sampling procedures. If required, they may be conditioned in a controlled temperature and humidity environment as detailed in this ASTM standard.

  1. The container is secured in the torque meter grips so that the axis of rotation of the cap is concentric with the centre of the moveable plate on which the container rests.
  2. Apply the closure with the recommended application torque in accordance with test method D 3810 and D 3198 or as specified by the closure manufacturer.
  3. With the container still in the torque meter, turn the closure counter-clockwise steadily for at least three complete revolutions of the outer cap. Do not exert any vertical force.
  4. The highest reading on the torque meter is the reverse-ratchet torque.

This overview is intended to provide a basic understanding of the test procedure and suitable equipment to meet the standard.
Please refer to the latest official ASTM test method D 3472-97 (2002) for more detailed information.

Digital torque testers can evaluate CRC reverse ratchet resistance
The CRC's reverse ratchet torque is measured and the results output