GenAcres Homestead

Why Canning Jars Break There are many reasons why canning jars break. The good news is that it is rare that they do, and most common reasons for breakage can be easily avoided keeping the following things in mind.  

Canning Jars Sizes and Their Common Usages Mason jars have many uses, but the glass in them is particularly molded for use in home canning to preserve food. The mouths of Mason jars have threads on their outer perimeter so they can accept a metal ring when it is screwed down onto them.