Sterilize Bottles and Jars for Canning

Fruit, vegetable, and meat preserves keep for a long time if properly prepared and canned. It's important to sterilize the jars and bottles before canning so that the food doesn't get contaminated with bacteria. See Step 1 to learn how to get your equipment ready by sterilizing it according to USDA standards.

Steps

Sterilizing Bottles and Jars

  1. Pick out appropriate glass jars and bottles. Look for jars or bottles designed for canning purposes. They should be made of tempered glass and free of nicks and cracks.[1] Be sure they each have appropriate tight-fitting lids.
    • Jars should have flat, gasket-lined lids with screw bands. Screw bands can be reused, but you'll need new flat lids.
    • Bottles should have rubber seals that are in good condition.
  2. Wash the jars and bottles. Use hot water and dish soap to thoroughly wash the jars and bottles you plan to sterilize. Make sure they are completely free of dried pieces of food and other debris. Wash the lids as well. They must be scrupulously clean.
  3. Place equipment in a deep pot. Put the jars and bottles upright in the pot. Place the lid rings around the jars and bottles. Fill the pot with water until it covers the jars and bottles by {{safesubst:#invoke:convert|convert}}.
  4. Boil the jars and bottles. Bring the water to a full, rolling boil. If you're at an altitude of less than {{safesubst:#invoke:convert|convert}}, boil them for 10 minutes. Add an additional minute for each additional {{safesubst:#invoke:convert|convert}} of elevation.[2]
  5. Use tongs to remove the equipment from the water. One by one, lift the jars, bottles and lids and place them on a paper towel to dry. Be careful not to let the sterilized equipment touch anything except the clean paper towel.

Filling and Sealing the Jars and Bottles

  1. Fill the jars and bottles with the food you wish to preserve. Do this while the jars and the food are both still warm. Adding warm food to cold jars will cause the jars to crack.[1]
    • Leave {{safesubst:#invoke:convert|convert}} of headroom at the top of each jar and bottle.[3]
    • Wipe the rims of the jars and bottles to make sure food drops won't affect the seal.
  2. Place the lids on the jars and bottles. Screw on the lid rings and make sure the lids are securely fastened.
  3. Set the jars on a rack inside a deep pot. The wire rack will keep the jars from touching the bottom of the pot, helping the contents of the jar get evenly cooked and ensuring that the jar seals properly. Use a jar lifter to place the jars on the rack.[3]
  4. Boil the jars. Fill the pot with water until the jars are covered by {{safesubst:#invoke:convert|convert}}. Boil the jars for 10 minutes, then remove them from the pot with a jar lifter and place them on paper towels.[3]
    • Wait 24 hours before handling the jars. They should be completely cool before you put them into storage.
    • Check the jar lids. A slight indentation in the flat lids shows that they have been properly sealed. If any of the lids are not indented, open the jars and use the contents instead of storing them.



Tips

  • A quick hot wash in a dishwasher works well to clean food residues off the jars but be sure to sterilize with boiling water or commercial sterilizing solution as described in the article, as dishwashers do not reach the temperatures required to kill all the microbes that can make you sick!
  • Bottles and jars may also be sterilized with a sterilizing fluid available from pharmacies.

Related Articles

Sources and Citations

  1. ↑ 1.0 1.1 http://www.countryliving.com/cooking/about-food/sterilizing-canning-jars
  2. ↑ http://nchfp.uga.edu/how/can_01/sterile_jars.html
  3. ↑ 3.0 3.1 3.2 http://www.marthastewart.com/267028/canning-tips
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