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==About==
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[[File:29wmt-articleLarge-v2.jpg|right|link=|200px]]
 
A Mason jar is a molded glass jar used in canning to preserve food. The mouth of the jar has screw threads on its outer perimeter to accept a metal ring (or "band"). The band, when screwed down, presses a separate stamped steel disc-shaped lid against the rim of the jar. An integral rubber ring on the underside of the lid creates a hermetic seal to the jar. The bands and lids usually come with new jars, and bands and lids are also sold separately; while the bands are reusable, the lids are intended for single use when canning.
 
 
==Use==
 
While largely supplanted by other methods for commercial mass production, they are still commonly used in home canning.
 

Revision as of 03:32, August 7, 2014

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