Microplastics
fragments of plastic less than 5 mm in length
Microplastics are "synthetic solid particulate matter or polymeric matrices, with regular or irregular shape and with size ranging from 1 μm to 5 mm, of either primary or secondary manufacturing origin, which are insoluble in water." Microplastics cause pollution by entering natural ecosystems from a variety of sources, including cosmetics, clothing, construction, renovation, food packaging, and industrial processes. However, there are different microplastic remediation strategies that can help mitigate the effects of plastic pollution.
The term microplastics is used to differentiate them from larger, non-microscopic plastic waste. Two classifications of microplastics are currently recognized. Primary microplastics include any plastic fragments or particles that are already 5 mm in size or less before entering the environment. These include microfibers from clothing, microbeads, plastic glitter and plastic pellets (also known as nurdles). Secondary microplastics arise from the degradation (breakdown) of larger plastic products through natural weathering processes after entering the environment. Such sources of secondary microplastics include water and soda bottles, fishing nets, plastic bags, microwave containers, tea bags and tire wear.
Both types are recognized to persist in the environment at high levels, particularly in aquatic and marine ecosystems, where they are considered water pollution. It is estimated that by 2050, the weight of microplastics in the sea will exceed that of the fish.
This brief starts where responsible research should: with the source description of “Microplastics” as fragments of plastic less than 5 mm in length. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as fragments of plastic less than 5 mm in length. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 8, 2026. The linked authority identifier is Q6839919. The Library of Congress control number is sh2016001401. None of the 1 selected statements returned an explicit reference. The first chronological checks are 2050.
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This entry incorporates text from “Microplastics” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.