Ball canning jars2/2/2024 If you have a jar that is between sizes, use the time and pressure for the next larger size.Jellies usually give directions for half-pint jars.Most fruit and vegetable directions include times and pressures for pint and quart jars.Sizes of Jarsĭirections for heat processing are based on the size of the jar. This year they introduced a stackable jar. Some popular European Jars also come in different sizes and shapes. Tulip-shaped jars are not recommended because the wider part of the jar will not heat at the same rate as the more narrow part. Decorative jarsīall released newly designed jars in a spiral shape in 16 and 28-ounce sizes and a Sharing Mason Jar (6 sided) available in a 16-ounce size. Some will have a warning “not for canning" molded into the glass. Some clear jars are made for craft purposes and not suitable for canning. In fact, look at box labels to determine that the jars are suitable for canning. You may find colored jars-blue, green, and purple-made for home food preservation the colored glass may distort the appearance of the food in the jar. Other colored jars such as yellow ones are designed for craft projects. Many are imported, and we do not have any information about the quality of those jars. We are seeing a number of new brands of jars on store shelves. Examine the jars carefully for any nicks, cracks, or hairline stress. Realizing the difficulty of buying new jars this year, you may end up using older jars from garage sales or handed down through the family. ![]() In the long run, it is often more economical to purchase new jars because you are risking less cracking of jars during processing and loss of product. The glass in newer jars appears to be thinner, but it has been tempered and is stronger. Jars from the mid-century often have a flat rim with rougher edges that sometimes cuts through the sealing compound of the lid. The tinted ones add a pretty touch of color in a room. Jars with wire bales or rubber rings used with glass or zinc lids should be used for storage only. Jars from the earlier period should be considered antiques and used only for decorative purposes. Recently an Extension Educator was asked about using old jars from the 1920’s to 1970’s. Jars that are handled carefully may still be in good condition and suitable for canning beyond 10 years. ![]() Over time this stress may create hairpin cracks that will weaken the glass. Each time a jar is used and exposed to heat it is subject to stress. Canning jars have a life expectancy of 10 to 13 years. You will discover more breakage after that because of the wear and tear of normal use. Mason glass jars are designed to be reused.
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