Pira uses a Mecmesin Orbis digital closure torque tester for measuring application and removal closure torques, calibrated in accordance with ASTM D3474. Applicable standard test methods include: ASTM D2063, "The torque retention of continuous thread closures on containers, with matching finishes, for predetermined environmental conditions over time" and ASTM D3198, "Standard Test Method for Application and Removal Torque of Threaded or Lug-Style Closures. Closures applied to nominal application torque are routinely tested for resistance to leakage after storage at elevated temperature, simulated transit vibration or vacuum testing as detailed in ASTM D4991 "The testing of empty containers for resistance to leakage under differential pressure conditions such as those which can occur during air transport".
