Hot coffee can pick up plastic particles from some tested takeaway cups and single-use drip bags. That evidence concerns the packaging and brewing materials—not sugar or creamer, which the sources covered here did not test as microplastic sources. “Paper” on a cup does not necessarily mean plastic-free: many paper cups have a thin plastic lining.
Do takeaway coffee cups release microplastics?
In a report published on 27 August 2026, the University of Queensland described tests in which hot liquid exposed to single-use cups lined with polyethylene (PE) or polylactic acid (PLA) picked up plastic particles. In that study’s comparison, tested PLA-lined cups released 12 times more particles than tested PE-lined cups. That ratio applies to the products and methods in the reported study; it is not a general rule for every PLA and PE cup. Read the University of Queensland report.
The cup’s appearance alone cannot tell you what its inner surface is made of. University of Queensland researcher Dr Elvis Okoffo said, “A cup made mostly of paper does not mean that the cup is plastic-free because many contain a thin plastic lining that provides water resistance and structural integrity.” A paperboard cup may therefore still have a plastic layer where hot liquid contacts it.
What another cup study found
In 2022, the US National Institute of Standards and Technology (NIST) reported that heated water contacting the lining of tested single-use beverage cups released microscopic particles, including nanoparticles. NIST defines nanoparticles in this context as smaller than one micrometer. This is evidence of particle release under the test conditions; it does not establish how much a particular person consumes or any health outcome. NIST’s results are a separate study and should not be combined with the University of Queensland’s comparison as if they were one measurement. See NIST’s report.
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Can coffee drip bags shed plastic particles?
A 2023 study tested drip bags made with polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and rayon, selected from eight brands. The researchers examined brewing time and temperature. The study abstract reports that one tested plastic drip bag steeped at 95°C for five minutes released more than 10,000 particles. That is a result for the tested products and laboratory protocol, not a universal estimate for every drip bag, filter, or cup of coffee. Read the study abstract indexed by PubMed.
The takeaway is format-specific: the drip-bag study looked at particles released from the bags it tested. It does not establish an individual’s daily intake, and its result should not be treated as a measure of exposure from takeaway cups. Those studies used different products and methods.
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Are sugar or creamer sources of microplastics in coffee?
The sources covered here do not test sugar or creamer as sources of microplastics in brewed coffee. They therefore do not establish that either ingredient is a cause—or that either is free of contamination. Cup-lining and drip-bag findings are not evidence about sugar or creamer. Removing them would not address the particle-release findings from the tested cups or bags.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What changes avoid particular single-use formats?
Practical changes can avoid the specific disposable item involved without promising zero exposure or a health benefit. The studies described above did not compare every reusable product or establish that any choice eliminates plastic particles.
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- For takeaway coffee: Bring a reusable cup, such as a stainless-steel cup, to avoid using a disposable takeaway cup for that order. Check the complete product construction, including its lid and any coatings: the cited life-cycle assessment does not establish that every reusable cup is entirely plastic-free.
- For drip-bag coffee: A reusable pour-over brewer or metal filter avoids the single-use drip bag itself. This is a practical format change, not a result from a head-to-head exposure test; the drip-bag study did not test reusable brewers or filters.
- If you keep using disposable cups or bags: Do not assume a paper appearance or a particular material label guarantees that the product releases no particles. The cited findings apply to the tested products and conditions, not every item sold under a broad material description.
What the reusable-cup life-cycle assessment does—and does not—say
A Government of Western Australia summary describes a life-cycle assessment comparing disposable 240 ml hot-beverage cups—including PE-lined paperboard with a polystyrene lid and PLA-lined certified-compostable paperboard with a bagasse lid—with reusable options including hard plastic and stainless steel. Its scenario modeled reusable cups over 100 uses. This is a comparison of life-cycle impacts, not a test of particles entering coffee or a finding about health. See the Government of Western Australia summary.
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