What is the turned under edge of the rim called that contacts the gasket?

The correct term for the turned under edge of the rim that contacts the gasket is known as the ogee flange. This part is crucial in ensuring a proper seal with the gasket, which helps to contain the contents of the container and maintain its integrity. The ogee flange typically has a specific curvature that connects smoothly with the container’s body, facilitating both strength and efficiency in sealing.

Understanding the importance of the ogee flange is essential in various manufacturing and design processes, especially in industries where airtight seals are necessary for product preservation. This makes the ogee flange a critical feature in containers used for beverages, food products, and other materials that require secure and reliable packaging.

In contrast, the other terms listed refer to different parts or features of containers or packaging systems, but do not describe the specific edge that interfaces with the gasket in sealing applications.