ABSTRACT
Rigid packages such as metal cans and glass jars are con-
tainers whose shape or contour is neither affected by its
contents nor deformed by external mechanical pressure of
up to 10 pounds per square inch gauge (68,947.3 Pa), which
is the normal firm finger pressure.[1] These containers are
especially appropriate to thermal processing where the risk
of potential changes in shape or contour exists, causing seal
failure due to high internal or external pressures. Their
impermeability and low chemical reactivity make rigid
containers a good choice to package foods and beverages
where an extended shelf life is desired.
