![]() Quite often they are considered “one time” use jars and have seams making them weak for our method of processing, that may result in breakage.įood safety educators are often asked how long a Mason jar is good for, which depends on how you treat them. There are some jars that even say “Mason” on them but they are not a true pint or quart jar and do not have the flat rim for a lid to tightly seal. Using jars from commercial foods is not a recommended practice. Examine the jars for nicks, cracks and chips. Question the seller to see if you can get the story on how the jars were used and stored. If you are a bargain hunter and have found jars at an estate sale or garage sale, proceed with caution, you have no idea of how they were stored and if the glass has been placed under stress which could result in breakage. They have had years of use and stress, possibly weakening the glass in places that could cause breakage. These newer versions of jars are fine to use, but the older versions (blue, purple, green and various shapes) are no longer recommended for use in processing. In 2014 you will also notice in the canning jar aisle there are blue and green canning jars. Half-gallon canning jars are recommended only for very acid juices. If a recipe does not specify a processing time in one of these jars, process the half-pint and 12-ounce jars for the same time as pints. Many foods do not have processing times for the smaller jars as they are typically used for jams and jellies. ![]() Pint and quart jars are the most common used sizes. Looking in the store you will notice that canning jars come in a variety of sizes from half-pint jars to half-gallon jars. Commercial mayonnaise jars may not seal and may break, especially in a pressure canner. According the National Center for Home Food Preservation, a Mason-type jar is specifically designed for home canning and is the best option. You want to make sure you are using a Mason-type jar. Test to ensure packaging meets product protection requirements.Not all canning jars are the same, especially when it comes to preserving your delicious produce. Provides varying degrees of protection from UV light.Consult 49 CFR for proper use & labelling. Packaging engineered & rigorously tested to meet government standards for the shipment of regulated substances.A tamper-evident container has one or more barriers to entry which if missing shows visual evidence the container was tampered with.National Sanitation Foundation certifies this product & its manufacturing process comply with standards for safety, quality, sustainability or performance. ![]() Must be used with cap provided to ensure leakproof performance. Containers engineered to prevent leaks and unplanned evacuation of contents.Container is suitable for high pressure processing.Product has the ability to resist degradation under extreme heat.Product is suitable for storing in freezer.Factory Mutual has tested & certified this product to ensure it meets rigorous loss prevention standards.Constructed of FDA-compliant materials suitable for contact with food. ![]()
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