ASTM D7860 Torque Retention for Child Resistant Packaging

For ASTM D7860 testing we recommend an Instron 6800 Series single column system with Torsion Add-On 3.0. for the lower grip, four post torsion grips are ideal since they can accommodate a wide range of bottle geometries. The upper grip should be a lathe chuck capable of grabbing onto the cap. The load cell should be biaxial. 

ASTM D7860 requires the test machine to apply the closure torque recommended by the manufacturer, and then determine the torque needed to open the packaging. Child-resistant closures require an additional evaluation of the force needed to align and subsequently engage the threads. The opening torque is captured at various time frames after the initial closure – this is defined by the standard and ranges from minutes to days. The purpose of this is to evaluate the torque retention, a measure of the difference in removal torque immediately after closure and for up to four weeks afterwards.