Kilner jar: glass preserving jar with rubber seal

Design and main parts

Traditional Kilner jars consist of three basic components: a glass body, a reusable sealing element and a removable lid or clamp. Early models used a molded glass lid pressed onto a ring of soft sealing material; later variants replaced that ring with a rubber or elastomer gasket. Modern versions sometimes have screw-top metal lids but retain the principle of a compressible seal. Key features include good optical clarity for contents, a wide mouth for filling, and materials that tolerate heating during processing.

History and origin

The Kilner name is linked to manufacturers based in Yorkshire, England, where the family firm produced preserving jars and related glassware. The basic idea of using a soft ring to create an airtight seal predates many modern canning systems, but the Kilner brand helped standardize a dependable, reusable jar for household use. Over time competing designs, such as threaded two-piece lids, became common, yet Kilner-style jars remain recognized for their heritage and practicality.

Uses, importance and examples

Kilner jars are widely used for canning jams, chutneys and pickles, by fermenters for sauerkraut or kombucha, and for dry food storage like grains and spices. They are popular in craft and retail contexts for packaging preserves and homemade gifts. Because the seal can be reused, they are valued for sustainability compared with single-use packaging. In kitchens and small-scale food businesses they provide a simple, visible and relatively long-lasting way to protect food from spoilage.

Variants and notable distinctions

There are several categories of preserving jars. Kilner-style jars are often contrasted with Mason jars and other threaded-lid systems: Kilner jars traditionally relied on a gasket and clamp or a glass lid, whereas Mason-type jars typically use a two-piece metal cap with a screw band. Some people call similar containers terrine jars or preserving jars, and modern manufacturers may market updated Kilner designs with metal screw lids, silicone seals or clip mechanisms. Replacement seals and accessories are widely available to keep older jars serviceable.

• Sealing element: often a rubber or silicone ring (seal).
• Body material: clear glass for visibility and low reactivity.
• Common uses: canning, fermenting, storage and decorative packaging.

Collectors and home cooks appreciate Kilner jars for their combination of simplicity, reusability and visual appeal. For further reading and sourcing advice, manufacturers and preservation guides remain helpful resources.

Learn more about jars • Sealing materials • Food storage basics • Yorkshire glassmaking • England manufacturing history