Type 1A child-resistant closures are reclosable continuous thread closures requiring a random push-down force while turning to remove from the container. No orientation of the push-down force is necessary.
Pre-conditioned representative samples of type 1A child-resistant closures are applied to appropriate containers, the application torque level being determined according to ASTM D 3198. The removal torque is then measured after fixed intervals, so that any degradation in the removal torque level can be ascertained. This fully degraded removal torque can then be compared to the reverse-ratchet torque determined according to ASTM D 3472.
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. Sufficient quantities of containers and closures should be provisioned to provide for at least five specimens at each of a minimum of three application torque levels for each time interval. If required, they may be conditioned in a controlled temperature and humidity environment as detailed in this ASTM standard.
Please refer to the latest official ASTM test method D 3810-97 (2002) standard for more detailed information. This overview is intended to provide a basic understanding of the test procedure and suitable equipment to meet the standard.
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Using the Tornado to test to ASTM D3810-97
Testing type 1A Child-Resistant closures
Capture, store & print minimum application torque