2 of 5 parts have unknown materials. We score only from captured evidence and never guess a material, so unknown parts count against the score and lower our confidence. If a seller confirms these materials, the score changes.
Where to buy
Parts & evidence
| Part | Material | State | Evidence |
|---|---|---|---|
| clamp | · | unknown | “12 clamps” listing ↗ |
| gasket | rubber | non-plastic | “place the rubber gasket on the bottom side of the glass lid” listing ↗ |
| jar | glass | non-plastic | “Our jars are made in Germany with the highest quality elements” listing ↗ |
| lid | glass | non-plastic | “6 glass lids” listing ↗ |
| ring | · | unknown | “6 rings” listing ↗ |
Research on plastic in jars
Official
Peer-reviewed journals, government agencies, and standards bodies.
“We found that food containers exposed to high-temperature released more than 10 million microplastics per mL in water.”
“All containers produced microplastics from 10 to 710 particles/L.”
Unofficial
NGO guides, independent testing, teardowns, and documented community reports.
“Glass bottles and jars with a plastic-coated metal closure may also shed microscopic bits of plastic, the study found.”
CNN · 2025
Quoted verbatim and linked to the source. We make no health claims of our own. Read the sources and judge them yourself.
Seller links may be affiliate links. Disclosure. We state observed evidence, not verdicts. See the scoring rubric.