Choosing the right closure for your composite can is not rocket science, but it must be well thought out before tackling your next packaging project. The key is to get the terminology down and to understand the functionality of each part. Here is a quick beginner’s guide:


Sifter tops: Functional covers used to dispense contents at a predetermined rate depending on the perforation shape and size. These types of openings are often used for seasonings and household powders. Sifter tops can be glued to the can or friction applied.

Slipcovers: Removable stamped metal closures that can also be embossed with print or graphic information to add a classy finish to a can. Slipcovers are often used in the wine and spirits, cosmetics, and even the clothing industry. They can also be slit to use for change collection cans or ballot containers.

Rings and plugs: As the term implies, a metal ring is seamed at the top of the canister. A metal bottom is also seamed on. Like slipcovers, plugs are inserted in the rings after filling.

EZO’s and foil membranes: Also known as “Easy Open All Aluminum closure tabs”. Like foil membranes, used to completely seal the top of the can. Used in the food industry, for grease cartridges, and oil treatment, tabs and membranes are usually coupled with plastic overcaps.

Overcaps: Also known as plastic protective covers. They are available in a near limitless amount of colours and opacity levels. Once the tabs or membranes are removed from the can, the plastic overcap serves as a flexible and reusable closure. It can also be used as an effective marketing tool by printing it with your branding.


Ends are punched tin plated metal and seamed on the bottom end of the cans.

Bottoms on the other hand are normally made from plastic and can be pressure fitted.

Now that you have the vocabulary to describe composite can closures, the only other thing to know is that they come in a wide variety of types, materials, and sizes. Let one of our customer service agents guide you through the process, by calling us at 1-888-5-CANFAB or emailing us at You can also take advantage of our volume converter tool on the Canfab website to give you an idea of the volume per can based on the diameter and height required.