Quick Answers
Can a microwave oven be used for home canning?
A microwave oven cannot be used for home canning. Low
acid foods must be processed at 240 degrees F.; a
microwave can only reach 212 degrees F. Even acid foods
must have the uniform heat provided by a conventional
water bath canner. Because of its uneven heating
pattern, a microwave oven does not assure consistent
heat to each jar during processing. There is also a
danger of explosion of jars as the molecules in the food
are moving faster which results in a vigorous rolling
boil. Explosion may occur as food is being removed from
the oven.
Barbara Willenberg, Nutritional Sciences, University of Missouri-Columbia
Last update: Monday, June 09, 2008
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