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Closure Torque Testing
Closure Torque Testing
Closure Torque Testing is a measure of the torque force required to either apply or remove a cap or lid on a container. This is frequently a two stage measurement. If the cap is tamper- evident: slip torque and bridge torque is measured. If the closure is child-resistant, a concurrent measure of downward load applied must also be made. Correct performance of container closures is always quality-critical, and in many cases it is safety-critical.
Benefits of Closure Torque Testing
These include:
- Ensuring the proper functioning of closures e.g. openability
- Ensuring the integrity and safety of products
- Reducing material costs and achieving lean manufacturing goals
- Compliance with industry standards
Standards
A number of standards for testing container closures have been developed. For example:
- ASTM D3810 Standard Test Method for Minimum Application Torque of Type IA Child-Resistant Closures
- ASTM D3198 Test Method for Application and Removal Torque of Threaded or Lug-Style Closures
- ASTM D3472 Test Method for Reverse-Ratchet Torque of Type IA Child-Resistant Closures
