Closure Torque Application

 

Torque is the rotational force applied during cap application or removal from a container. When applying a closure to a container, it is important to utilize the correct amount of torque to ensure a proper seal. Ideally, torque should be evenly distributed throughout the closure.

Over-tightening may cause some points on the cap to have more pressure then others, which may result in an improper seal. If the cap is applied with too little torque, the container may leak or the closure could come off too easily.

The chart below illustrates the recommended torque to apply or remove closures of a specific size and material. The figures are based on the minimal amount of torque needed to apply or remove a closure. As a general rule, the amount of torque is about half of the diameter of the cap. Torque is expressed in inches per pound.

As always, since packaging variables come into play, be sure to test your specific application to ensure optimal results and safety. The most accurate way to measure torque is with a torque tester.

 

PP / PE Caps (Glass) PP / PE Caps (Plastic)
Cap Size (MM) Application Torque Removal Torque Application Torque Removal Torque
15 12 7 8 4
18 13 8 9 5
20 15 9 10 5
22 17 10 11 6
24 18 11 12 6
28 21 12 14 7
33 24 14 17 8
38 29 17 19 9
43 33 20 22 11
48 36 22 24 12
58 44 26 29 14
70 52 32 35 17
89 65 40 45 22
100 75 38 50 25

DISCLAIMER: This information should only be used as a guide in determining the proper application torque. It is the responsibility of the customer to conduct adequate testing to ensure proper results.

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