During the life cycle of a screw closure, there are a number of factors where the the performance of the closure is influenced by a particular torque value
- Filling / Sealing
- Storage & distribution
- first opening
- Use, reseal and re-use
In addition to torque generally associated with screw closures (eg application and removal torque), closure development areas such as tamper-evident seals, or child resistance have increased the range of torque which need to be measured. Technical Standards
There are a number of international standards which specify equipment and test procedure for evaluting , closure torques and the ability of closures to retain torque e.g. ASTM D3192, ASTM D3474, ASTM D2063,ASTM D3198.
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