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CPS University | Closureology 101
CPSU: Learn more about styles, types, materials, and terms
Closures come in many different shapes and styles to fit your product's unique application. On this page you will learn the different styles and types of closures and for what they are commonly used. At any time, feel free to call 1-800-473-4144 to speak with an expert. View our Image Catalog for a quick view of all of our closures.
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Domed LidsThe domed lids typically have a flat top, rounded shoulders and a straight skirt. These lids are typically smooth with no ribbing and can come in various colors and materials like plastic, metal and glass. Common uses include: lotions, creams, medication wipes, typically partnered with plastic jars. |
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Ribbed LidsThe ribbed lids can be caps, sprayers, or other closures that have ribbing. Ribbing is a series of small vertical grooves decorating the lid skirt. The purpose of ribbing is to not only provide some decorative appeal, but also facilitates gripping the lid skirt. Common uses include: any applications and products. |
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Smooth LidsSmooth lids can be caps, sprayers or other closures that have no ribbing on the lid skirt. Ribbing is a series of small vertical grooves decorating the lid's skirt. Smooth caps and closures lacking ribbing may be more difficult to twist, but have an elegant, smooth and reflective surface. Common uses include: any applications and products. |
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Continuous Thread Metal LidsThe continuous thread metal lids are lids that have been threaded with an unbroken thread inside the lid skirt. These differ directly with the lug or twist caps which are not threaded continuously. Many of these caps have a slight ribbing along the shoulders to assist in gripping. Common uses include: chemicals, solvents, foods. |
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Lug or Twist CapsThe lug or twist caps are made of metal. These lids are threaded, but unlike the continuously threaded lids, have a broken threading. This means that these lids can be fully sealed in a quarter turn as opposed to a full turn-and-a-half like the continuous thread lids. Common uses include: preserves, jellies, jams, sauces. |
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Metal Slip Cover or Friction Fit LidsThe metal slip cover or friction fit lids are non threaded closures. The slip cover, non threaded lids on tins, for example stay fitted to the container due to friction. The lids have a rolled base to protect from cutting. These lids do not provide an spill proof or air-tight seal. Common uses include: tin lids for candles, candies. |
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Snap On Tub LidsThe snap on tub lids are made of flexible plastic which can be snapped on the tub opening. These lids provide and air tight, spill proof seal. These lids have a series of indentations, grooves, and skirts to provide the necessary tension to fit the container. Common uses include: butter, yogurt, ice cream, dairy products. |
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Liners (F217, PE, PS, HIS) and Sealing DiscsLiners are inserted into the lid and assist in keep the lid/container seal spill proof and air-tight. There are many types of liners which can be used for many different products and applications. View Terminology 101 (our glossary) for definitions of our liners: F217, PE, PS, and HIS. Sealing Discs are inserted to prevent product from getting on the lid. They can also be decorated. Sealing discs are mostly for aesthetics. |
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