ASTM D3469Standard Test Methods for Measurement of Vertical Downward Forces to Disengage Type IIA Lug-Style Child-Resistant Closures
These test methods measure the downward forces during the disengagement of lug-style caps from their respective containers. The methods measure the maximum torque developed while the cap is further disengaged by turning of the container. Lug-finish: multi-threaded, like a jam-jar, such that the lugs click into a seated position on closure, requiring an initial downward force to release the lugs onto the screw threads. Vertical force to disengagement is force required to release lugs from locked position to allow rotation.
Before conducting ASTM D3469, it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.