How to Seal a Kilner Hexagonal Twist Top Jar Properly

By Kilner® - Iconic Glass Jars, Bottles & Equipment | Kilner® | Published: 2026-10-23

Category: How-to Guides

Learn the correct method to seal your Kilner Hexagonal Twist Top Jar 280ml for long-lasting preserves. Step-by-step instructions with common mistakes to avoid.

Quick Answer

To seal a Kilner Hexagonal Twist Top Jar properly, ensure the lid and rim are clean and dry, then twist the gingham-printed lid firmly until snug—do not overtighten.

Why Proper Sealing Matters

A good seal keeps your jams, jellies, chutneys, and dried herbs fresh for longer. The Kilner Hexagonal Twist Top Jar 280ml uses a one-piece lid with a gingham print that relies on a clean rim and correct torque. Skipping these steps can lead to spoilage or a weak seal.

Common Mistakes to Avoid

Many people overtighten the lid, thinking tighter is better. This can warp the seal or make the jar hard to open later. Another mistake is sealing when the jar or lid is still wet, which can trap moisture and cause mold. Always dry both surfaces thoroughly.

Steps to Seal Your Kilner Hexagonal Twist Top Jar

1. Clean and Dry the Jar Rim and Lid: Wipe the rim of the jar and the inside of the lid with a clean, lint-free cloth. Ensure no food residue or moisture remains. Any debris can break the seal. Even a tiny grain of sugar can prevent an airtight seal.
2. Fill the Jar Leaving Headspace: For preserves like jam or chutney, leave about 1 cm of headspace from the rim. For dried herbs or spices, fill to the brim but don't pack tightly. Overfilling can push food onto the rim when you twist the lid on. Check recommended headspace for your specific preserve recipe.
3. Place the Lid Centered on the Jar: Set the gingham-printed lid squarely on top. Do not tilt it. A crooked lid will not thread evenly and may leak air. If the lid feels off-center, lift and reposition it rather than forcing it.
4. Twist the Lid Firmly Until Snug: Hold the jar body in one hand and twist the lid clockwise with the other. Stop when you feel firm resistance—do not force it further. Overtightening can damage the lid or make the jar impossible to open later. A snug fit is enough; you should not need to use full grip strength.
5. Test the Seal (Optional for Storage): After sealing, gently press the center of the lid. If it flexes or pops, the seal is not airtight. Re-clean the rim and repeat steps 3-4. A properly sealed lid will feel firm and not move when pressed. For preserves, you can also invert the jar briefly to check for leaks.

Product Facts

Kilner® Hexagonal Twist Top Jar 280ml: This Kilner® 280ml Twist Top Jar is perfect for storing dried foods such as herbs, spices along with preserving jams, jellies and chutneys. The gingham printed one-piece lid a The one-piece design means you don't need separate seals or bands, but the lid's seal depends on a clean, dry rim and proper twisting technique.
Kilner® Hexagonal Twist Top Jar 280ml