Flint glass battery jars are heavy-duty jars made of soft glass used to house a conductive solution. These jars cannot tolerate high heat. Five sizes are available.
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Heavy-duty, flint glass jar. Flint glass is soft glass that cannot tolerate high heat as can borosilicate glass. If you want a high temperature vessel, use a large size borosilicate glass beaker. Round battery jars have fire polished lip.