Microplastics consist of carbon and hydrogen atoms bound together in polymer chains. Other chemicals, such as phthalates, polybrominated diphenyl ethers (PBDEs), and tetrabromobisphenol A (TBBPA), are typically also present in microplastics, and many of these chemical additives leach out of the plastics after entering the environment.
Primary microplastics are small pieces of plastic that are purposefully manufactured. They are usually used in facial cleansers and cosmetics, or in air blasting technology. Primary microplastics are tiny particles designed for commercial use, such as cosmetics, as well as microfibers shed from clothing and other textiles, such as fishing nets, personal care products, plastic pellets, and plastic fibres used in synthetic textiles (e.g., nylon).toothbrush bristles.
Secondary plastics are small pieces of plastic derived from the breakdown of larger plastic debris, both at sea and on land. Over time, a culmination of physical, biological, and chemphotodegradation, including photodegradation caused by sunlight exposure.
Secondary microplastics are particles that result from the breakdown of larger plastic items, such as water bottles.
Examples of primary microplastics include microbeads found in, (or nurdles) used in industrial manufacturing,
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