This ASTM test method describes the procedure for pre-conditioning containers and their closures before measuring the torque needed to close the container, and then open it again. The results can be of use for rating the performance of automatic capping machines, observing the tendency of closures to loosen during storage or shipment, or the force required to break hard plastic and overturn or “strip” soft plastic and metal closures.
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. A special cap mandrel may be used to hold the closure to facilitate application and removal without distorting the closure.
Separate, unused containers and closures are pre-conditioned at a specified temperature and relative humidity for 48 hours.
Please refer to the latest official ASTM test method D 3198-97 (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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Measure torque in your choice of units
Testing threaded closures
Capture “Application torque” and “Removal torque”