Are Kilner® Jars Safe for Canning? Myths and Facts Explained

Quick Answer

Kilner® jars are safe for boiling water bath canning when used with proper sealing methods like wax discs, but they are not recommended for pressure canning. Always follow tested recipes and use the correct jar type for your preserving method.

Home preserving is a beloved tradition, and Kilner® jars are iconic in the world of canning. Yet, questions about their safety for canning persist. Are Kilner jars safe for canning? The answer isn't a simple yes or no—it depends on the method and the jar's design.

In this article, we'll bust common myths and present the facts, so you can preserve with confidence. Whether you're a seasoned canner or a beginner, understanding the capabilities and limitations of your jars is crucial.

Myth 1: All Glass Jars Are Safe for Canning

Many assume that any glass jar can be used for canning. However, canning requires jars that can withstand high temperatures and pressure. Kilner® jars, with their classic clip-top design, are excellent for water bath canning and storing dry goods, but they are not designed for pressure canning.

The U.S. Department of Agriculture (USDA) recommends using jars specifically designed for canning, which are typically tempered to withstand high heat. Kilner® jars are not advertised as pressure-canning safe. For pressure canning, you need jars that meet specific standards, and Kilner® does not claim this capability.

• Check the manufacturer's instructions before using any jar for canning.
• For boiling water bath canning, Kilner® jars with new seals are suitable for high-acid foods like jams and pickles.

Myth 2: Kilner® Jars Can Be Used for Pressure Canning

Pressure canning involves temperatures above 240°F (115°C) and high pressure, which can stress glass. Kilner® jars are not rated for pressure canning, and using them in a pressure canner could lead to breakage or seal failure.

The Kilner® brand is famous for its clip-top jars, which rely on rubber seals. These seals are not designed to withstand the pressure differentials of pressure canning. For pressure canning, you should use jars specifically labeled as pressure-canning safe, such as Mason jars with two-piece lids.

• Never use Kilner® clip-top jars in a pressure canner.
• If you need to pressure can, invest in jars designed for that purpose.

Myth 3: Kilner® Jars Can't Seal Properly for Water Bath Canning

Some believe that Kilner® jars with clip tops cannot achieve a proper vacuum seal. In reality, when used correctly with fresh rubber seals, they can seal effectively for water bath canning. The clip-top design allows air to escape during processing, and as the jar cools, the seal is drawn tight.

For an extra layer of protection, many home canners use Kilner® Wax Discs to create an airtight barrier. These wax discs are specifically designed to seal jam jars and help keep preserves fresh. They are a traditional method that works well with Kilner® jars.

• Always use new rubber seals for each canning batch.
• Wax discs can be used in addition to the clip-top seal for extra freshness.

Verdicts on Kilner® Canning Safety

• Claim: Kilner® jars are safe for all canning methods: Verdict: False. They are safe for boiling water bath canning but not for pressure canning. Use Kilner® jars for jams, pickles, and other high-acid foods only.
• Claim: Kilner® jars cannot create a proper seal: Verdict: False. With fresh rubber seals and proper technique, they seal effectively for water bath canning. Always use new seals and follow tested recipes for best results.
• Claim: Kilner® jars are not durable enough for canning: Verdict: True for pressure canning, but they are durable for water bath canning and everyday storage. Store dry goods and use for water bath canning with confidence.

Kilner® Products for Safe Preserving

• Kilner® Set of 3 0.5 Litre Preserve Jars: Classic clip-top design ensures freshness, perfect for preserving fruits, jams, and sauces. These jars are ideal for boiling water bath canning of high-acid foods, and their 0.5L size is versatile for various recipes.
• Kilner® Wax Discs for Sealing Jam Jars: Pack includes 200 discs in two sizes (5.5cm and 7.5cm) to create an airtight seal. Using wax discs adds an extra layer of protection for your preserves, ensuring they stay fresh longer.

Kilner® jars are a fantastic choice for water bath canning and preserving high-acid foods. By understanding their capabilities and limitations, you can safely enjoy the art of home preserving. Explore the Kilner® Set of 3 0.5 Litre Preserve Jars and Kilner® Wax Discs to start your canning journey with confidence.