Weck Mold Jar

Yes, the combination of the glass lid, rubber gasket, and stainless steel clamps creates a secure, airtight seal. This makes them excellent for canning, preserving, or keeping dry goods fresh for extended periods.

Yes, they are freezer-safe, but you must use the optional 'Keep Fresh' plastic covers instead of the glass lids and clamps. The glass lids and metal clips are not designed for the expansion that occurs during freezing.

The glass jars themselves are microwave safe, but you should remove the stainless steel clamps before heating. The rubber gaskets are also heat-resistant, but it is best practice to remove the metal components to avoid any potential arcing or damage.

The rubber gaskets are dishwasher safe and can be cleaned along with the glass jars. If you notice them becoming stained or holding onto strong odors over time, they are inexpensive to replace.

To open a sealed Weck jar, simply pull the rubber tab on the gasket to break the vacuum seal. Once the seal is broken, the metal clamps can be easily removed, and the lid will lift right off.