Researchers from Japan’s RIKEN institute and the University of Tokyo have developed a new plastic material that dissolves completely in seawater within one to three hours, with no toxic residue or microplastic byproducts. The material is made from food-safe components and utilizes ionic bonds that remain stable during use but rapidly disintegrate in saltwater environments.
This innovation addresses a critical global challenge—over 11 million tons of plastic enter oceans annually, often persisting for centuries. The newly developed polymer not only decomposes safely in seawater but also breaks down in soil, potentially enriching it.
The material is already being considered for packaging, single-use items, and medical applications. Its complete degradability makes it a promising candidate for industries under pressure to eliminate microplastic pollution and improve sustainability credentials.
This breakthrough aligns with recent global efforts in the biodegradable materials sector. In July 2025, Danimer Scientific partnered with TotalEnergies Corbion to scale PHA resin production. NatureWorks expanded its Ingeo biopolymer facility in Thailand in June, while BASF acquired a stake in Bluepha, a Chinese seawater-degradable material innovator, in May. Mitsubishi Chemical launched a marine packaging pilot in April.
Technological developments, including enzyme-triggered plastics and smart coatings, are driving adoption of marine-degradable packaging solutions worldwide.