This standard gives instructions for the testing the force required to open type IIA child-resistant closures by stripping the lugs without applying any downforce. This can be used to evaluate the continued effectiveness of the closure for child-resistance and adult opening and reclosing throughout the expected use and shelf life of the package.
New, clean containers are fitted with their appropriate closure, then the torque required to force open the closure is measured without applying any downforce.
Test apparatus
Torque testing equipment
Humidity/temperature controlled chamber if required
Optional mechanical cap gripping aid
1. Select sufficient new containers and closures for the test to be statistically significant. If required these can be pre-conditioned by storage in atmospheric conditions given in the standard.
2. Fit the closure to the container, applying downward force to reduce or eliminate closure lug wear.
3. Grip the closed container in the torque measuring device, and apply opening torque being careful not to exert any downward force.
4. Record the maximum torque
5. Report all details necessary to identify the containers and closures. Report the average torque, the range and standard deviation.
Hand operated force and torque gauges can be used. Alternatively motorised stands will provide superior repeatability and safeguard the operator against repetitive strain injury. They can also store the results and produce reports including statistical summaries of the data.
Tornado digital torque tester
Vortex-xt motorised torque testing system
/touch-screen-controlled-torque-test-system
Please refer to the latest official ASTM test 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
