Does Loose leaf tea with a stainless steel infuser have microplastics?
The short answer
No meaningful source. Steel mesh in a glass or ceramic pot puts no polymer in the water at all, which makes this the clean answer in a category where the alternative holds the record for the largest measured single-item release.
Why Loose leaf tea with a stainless steel infuser scores 9
Steel and glass only — there is no polymer in the system to release anything
Heat is irrelevant when nothing in contact with the water is thermally sensitive
Silicone-rimmed infusers exist and put a small elastomer face back in the water
Loose tea is usually sold in foil-lined pouches or tins, which is a storage question rather than a brewing one
Where the 9 comes from
Five components, added. The page renders the parts rather than a stored total, so the number cannot disagree with the reasoning behind it.
- Packaging contact
- 2 / 30
- Use conditions
- 5 / 25
- Measured release
- 2 / 25
- Polymer behaviour
- 0 / 10
- Processing
- 0 / 10
What material touches the contents, over how much surface area, for how long. Glass and steel score near zero here; a film pressed against fatty food scores near the top.
Heat, abrasion, flexing, repeated opening, reuse beyond design life. The same bottle scores differently in a fridge and in a hot car.
What a laboratory actually counted, for this product or its category. A high number here means real particles were measured, not that the material looks suspicious.
How this specific polymer behaves — brittleness, fat solubility of its additives, thermal stability, whether it is a polymer named in existing restrictions.
What happened before you bought it. Retort sterilisation inside the pack, hot-filling, and pressurised brewing all happen at the most migration-favourable moment.
What we don't know
Not measured, because there is nothing obvious to measure. We grade it C rather than A for exactly that reason: absence of a plausible mechanism is a strong argument and it is not a laboratory result.
This section is on every page in the database, including the ones where the answer is comfortable. How evidence grades work →
Better options
Ordered by how much they change, not by how much they cost.
Already the cleanest option in this category
choose an all-steel infuser over a silicone-rimmed one
Check the one in your kitchen
This page scores Loose leaf tea with a stainless steel infuser as a product. Formulations, packaging and suppliers change, and the specific item you own has its own condition — a scratched pan and a new one are not the same object. Scan yours for a score built from what is actually in front of you.
Scan my teaSources behind this score
Each with the finding we use it for and the limitation that finding carries — because a study quoted without its boundaries is how this subject got so noisy.
- peer-reviewed2019
Hernandez 2019 (McGill) — A single nylon or PET pyramid tea bag steeped at 95°C released about 11.6 billion microplastic and 3.1 billion nanoplastic particles into one cup.
Limitation: Four commercial bags, brewed empty of tea leaves to avoid interference. The particle count is enormous but the total mass is small, and the study measured release into water, not what happens after you drink it.