PlantSea: EIC Accelerator Bet on Seaweed Film for Laundry Pods

A laundry capsule is a dose of detergent sealed in a film of polyvinyl alcohol (PVA, also written PVOH), a synthetic polymer that dissolves in the wash. PlantSea, a company in St Asaph, North Wales, says it can make that film from seaweed instead: water-soluble, compostable at the end of its life, processable on the machines film makers already run, and, in the words of its EIC project summary on CORDIS, at price parity with high-end PVA.

The European Innovation Council selected the project at its 1 October 2025 cut-off. PlantSea appears, grant only, in the EIC's list of selected companies, and CORDIS records an EU contribution of €2,499,568.75 for a project running from 1 May 2026 to 30 April 2028. Six months into that project, the polymer is in scale-up, the company says paid pilots are under way with brands it does not name, and no sale to a film manufacturer has been announced.

A student prize in Aberystwyth

The company was registered at Companies House on 8 April 2020. Two weeks later Aberystwyth University announced that Alex Newnes and Gianmarco Sanfratello, then PhD students, and Rhiannon Rees, an alumna, had won its InvEnterPrize student enterprise competition with a bioplastic made from Welsh seaweed: £10,000 and a year of free office space. Their first idea was biodegradable wash kits for hotels to replace plastic sachets. The Development Bank of Wales later named all three as founders. The register of officers shows Sanfratello leaving the board on 28 March 2025 and Dr Belinda Howell joining it on 20 April 2026.

The product line widened before it narrowed. In September 2024 the Development Bank of Wales listed a water-soluble film for laundry detergents, a biodegradable mulch film and a seaweed-infused paper, with seaweed sourced from Scotland. The company website today sells paper, labels and stationery, and presents the film as the core business: a polymer offered to industrial film manufacturers as a replacement for PVOH.

The technology: a natural polymer in a synthetic slot

PVA film is the standard wrapper for laundry and dishwasher capsules because it dissolves fully in water. PlantSea extracts a polymer from seaweed by biorefining and casts it into a film meant to do the same job. The CORDIS summary describes the film as flexible, water-soluble, biodegradable and compostable, designed to scale on existing manufacturing equipment, with laundry and dishwasher capsules as the first market and wider use in packaging, cosmetics and cleaning products. Packaging Scotland reported the company's claims that the film can be heat-sealed or vacuum-formed by conventional processes and is designed to match the cost of PVOH.

The drop-in claim is the commercial point. The company's current UK project, PS Pellet, is about turning the polymer into stable, transportable dry pellets that work on existing film lines without modification, and its abstract states that lab trials show the material can replace PVA. In June 2026, CTO Alex Newnes said in a company release that the polymer matches PVOH on functional performance. No independent test data on dissolution speed, film strength or shelf stability against PVA has been published by the company or its partners, and no patent filing by PlantSea came up in the searches made for this article.

Seven UK grants, a crowdfund and then the EIC

Before the EIC, PlantSea was funded mostly by UK grants and small equity rounds. UKRI's Gateway to Research lists seven Innovate UK and Industrial Strategy Challenge Fund projects with PlantSea as the award holder, from PlantSea-Pack in May 2021 to PS Pellet, an Investment Accelerator project with a funded value of £545,385 running from February 2026 to July 2027. UKRI also lists a textile coatings study led by the denim finisher LaundRE in early 2026, in which PlantSea supplied its polymer.

The equity came in steps. In September 2024 the Development Bank of Wales announced a £220,000 investment as part of a pre-seed round of over £800,000 with Sustainable Ventures and SFC Capital. In January 2026 the company announced a £1.8 million seed round, a figure that includes grants. Packaging Gateway reported in February 2026 that a crowdfund on Republic raised £350,000 against a £50,000 target from more than 500 backers, taking the seed total from grants and private investors past £1.85 million.

All five UK companies in the October 2025 list were selected for grants only. The European Commission states that the UK has been associated to Horizon Europe since 1 January 2024, and that UK access to the EIC Fund runs under transitional arrangements from the 2026 budget onwards, with any investment decision conditional on an amendment of the association agreement.

What the accounts show

PlantSea files small-company accounts without a profit and loss statement, so no revenue figure is public. The balance sheets at Companies House still trace the funding. Cash stood at £30,273 on 30 April 2025 and £785,824 a year later, and the share premium account rose from £641,518 to £1,824,065 over the same year, after share allotments filed between December 2025 and April 2026. The deficit on the profit and loss reserve grew from £589,240 to £966,517. Net assets were £857,554.

The going concern note in the 2025 and 2026 accounts says the company receives grant funding and equity investment and generates trading income that is growing. It also says the directors considered material uncertainties that may cast doubt on the company's ability to continue as a going concern, and concluded that the going concern basis remains appropriate. The average headcount, including directors, rose from 2 in the first year to 11 in the year to April 2024, then fell to 10 and to 8.

After the 2026 year end, the register shows a special resolution of 22 June 2026 to reduce the issued share capital, supported by a directors' solvency statement dated 28 May 2026. The filings do not say why.

What the EIC project promised, and what can be checked

The EIC project is in its seventh month, and CORDIS shows no report or result yet. The company's own descriptions give the targets: scaling production from lab scale to 10,000 litres, building a first demonstration biorefinery in North Wales, and moving from research to industrial supply, per its February 2026 release. In June 2026 it announced £130k of grant-funded work under the Henry Royce Institute's Industrial Collaboration Programme, with CPI taking the biorefining process to its next stage and Royce Manchester characterising the polymer, to go from 450 litres to 5,000 litres over five months.

The January 2026 release said the polymer could be on sale to leading film manufacturers within 12 months. Both that release and Packaging Gateway describe paid pilots with global brands, none of them named. As of 4 November 2026, the latest post on the company's news page is the Royce announcement of 5 June 2026; no film manufacturer customer, biorefinery site or construction start has been announced there.

1. Scale production to 10,000 litresIn progress450 to 5,000 litre step announced with CPI and Royce in June 2026; outcome not yet reported.
2. First demonstration biorefinery in North WalesNot yet publicNo site, capacity or start date announced.
3. Drop-in replacement for PVA filmClaimLab trials cited in the UKRI abstract; no independent comparison published.
4. Supply to film manufacturersNot yetPaid pilots claimed with unnamed brands; no customer announced.

Where it fits in EU policy

The CORDIS summary ties the project to the European Green Deal and the Single-Use Plastics Directive, and frames it as a bio-based material that leaves no microplastics. Packaging Europe describes the PVA and PVOH the film would replace as petroleum-derived. Whether PVA film needs replacing on environmental grounds is the open question in the callout above. The CEO told Packaging Scotland that, adopted at scale, the technology could remove billions of plastic-based capsules from the supply chain; that depends on the film matching PVA on cost and performance, which is the claim still to be shown.

The reporting is based on publicly available sources, listed below.