Sterilising Jam Jars & Hygiene

New to preserving? Follow our guide to start the preserving process and you will soon be stocking up your cupboards with scrumptious strawberry jam and other delectable delights! 

Step 1 - Sterilising your jars

Sterilising your Kilner® Jars and Bottles is an important process in preserving. Sterilising is required to remove all bacteria, yeasts, fungi and organisms from the jar so that when you use it for preserving, the food will remain fresh within the vacuum. We recommend the water bath method of sterilising. 

The first process of sterilisation is to check the jars or bottles thoroughly for damage such as cracks, breaks, and chips. If you find any of your jars or bottles are damaged you must discard them.

It is important that you only sterilise your jars, bottles and lids or seals a short time before you are ready to fill them to ensure they remain warm for the filling process.

Sterilising Kilner Jars

Kilner Jam Pan for Sterilising

Step 2 - Water Bath

Remove the lids or rubber seals from your jars and put to one side. Place a heat resistant plate upside down in the bottom of your Kilner® Preserving Pan then place the jars inside. Fill the pan with cold water until the jars are covered. Bring to the boil and keep at the maximum temperature for 10 minutes, turn the heat off and cover the pan to keep the jars warm until you are ready to fill them.

Do not attempt to sterilise your Kilner® Bottles and Kilner® Jars by pouring boiling water into them.

Place vacuum seal lids or rubber seals in a small pan and fill with 4 inches of water, heat and simmer at 82 degrees for 10 minutes, turn the heat off and cover the pan until you are ready to seal the jars.

Watch How To Sterilise your Kilner® Jars Before Use


Important: Do not attempt to sterilise your Kilner® Bottles and Kilner® Jars by pouring boiling water into them.

Always take care when sterilising and handling hot jars and lids. Please use the appropriate equipment such as Kilner® Jam Jar Tongs or oven gloves.

Do not sterilise your jars using the oven method as ovens can harbour bacteria from food that is stuck on the oven. A conventional oven with a fan will circulate bacteria.