Nail Polish Cap Torque

Nail polish cap torque describes the rotational force required to apply and remove the cap assembly while maintaining a reliable seal against volatile solvents. Because the cap usually carries the brush stem, torque also influences stem alignment, wiper contact and repeatable application. Buyers should define application torque, removal torque and acceptable tolerance ranges against the actual neck finish, cap material and any liner or sealing geometry. Capping equipment settings, filling temperature, storage conditions and ageing can alter torque retention, so specifications should be confirmed with production-representative samples and documented inspection methods. The goal is a closure that seals consistently, opens without excessive effort and keeps brush positioning stable throughout the product’s life.