No, don't reuse old lids. While it may look like
there's enough sealing compound present on last year's metal lids, once the
compound has been indented, it is unlikely to seal again safely. Screw bands can
Several older kinds of lids are no longer recommended because their failure
rate is high. Throw away zinc lids, old metal bands used with rubber rings, and
glass lids, or alternatively, store dried foods in these jars. Outdated jars and
lids can still be useful for nonperishables, but not for canning.
lids are not intended by canning purposes.
The flat metal lid with sealing compound and metal
screw band is the most popular type of cap for home-canned
products. To use, center lid on the rim of the jar with
the sealing compound next to the glass. Screw the band
firmly to hold the lid in place. Do not loosen. During
processing, air is exhausted from the jars so that as
the jar cools, a vacuum pulls the lid tightly against
the rim of the jar. When the jar is completely cooled
and sealed, remove the screw band. The vacuum and the
sealing compound will maintain the seal.
The screw bands may be reused as long as they are
not bent out of shape, but the fiat lids are designed
for one-time usage. Be sure all closures are perfect.
Don't use any with dents or rust because these prevent
airtight seals. Wash all lids and bands. Metal lids
with sealing compound may need to be boiled or held
in boiling water for a few minutes; follow the manufacturer's
Do not reuse flat metal lids in home canning. Every
of lid has a different sealing compound, follow package
directions exactly when preparing the lids for canning.
Gasket materials are designed to soften under heat and
pressure to provide an air-tight seal and maintain a
vacuum in the jar.