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How to Sterilize Glass Jam Jars

Author:Site Editor     Publish Time: 2017-12-04      Origin:Site

To prevent contamination and lengthen the shelf life of homemade jams and sauces, it's important to sterilise jars or bottles before you package them up. Today we are gonna share how to sterilize glass jam jars.


Glass Jam Jars Sterilization:the easiest method

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The dishwasher method is the easiest method for sterilizing your jars good if you have a high-temperature setting on your machine/ Or as I do, a steam dishwasher.


Fill your dishwasher with clean cold jars and run a minimum or rinse wash to time the ending with when your jam, preserve or pickle will be ready.


Use the glass jars once at a time from the dishwasher needed making sure you fill while the jam or preserve is hot as is the jar.


Glass Jam Jars Sterilization:the most trusted method

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The oven method is the most trusted method for ensuring your jars are scrupulously clean for your preserves. It takes slightly longer than the other methods but starts the process about 30 minutes before your preserves are ready to pot and you will not even notice the time.


Heat the oven to 130°C/ 275°F/ Gas  Do not be tempted to heat the oven any higher or you may risk the glass breaking.


Lay a double layer of newspaper on each oven shelf but not the floor of the oven. If you are using a gas oven, make sure your newspaper is well away from any flame. If it is on a middle shelf, you will be fine.


Arrange the glass jars on the oven shelf, making sure the jars are not touching each other. Close the oven door and sterilize the jars for a minimum of 20 minutes.


Using thick oven mitts, remove each jar from the oven as needed onto a heatproof mat or heat pad, making sure you fill while the jam or preserve is as hot as the jar.


Sorry to keep saying this but one of the most dangerous parts of potting preserves - do NOT add cold food to hot jars, or hot food to cold jars; otherwise the jar will shatter.


Glass Jam Jars Sterilization:the microwave method


This method of sterilizing is good for regular jam jars but not the glass jam jars with metal lids.


Clean the jars as normal, rinse but leave the jars a little wet. Microwave for 30 - 45 seconds depending on the size of the jar.


I recommend not using old jam jar lids if they are damaged or rusty, they should be thrown away as they may not make a good seal. Instead, use wax discs and cellophane or buy new lids.


5 Tips for Sterilization of Glass Jam Jars


1.As already mentioned several times above, do NOT add cold food to hot jars, or hot food to cold jars.

2.I recommend not using old jam jar lids if they are damaged or rusty, they should be thrown away as they may not make a good seal. Instead, use wax discs.

3.Remove jars from the oven or dishwasher only when needed or they will cool down too much.

4.Always sterilize more jars than you think you will need. Should you have more mixture than anticipated it is too late to start sterilizing once the food is ready.

5.Leave jams, preserves or pickles to settle for 15 minutes before sealing.


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