NGOS and shipping industry make ground-breaking joint call for review of legal discharge status of polyisobutene (PIB)


The number of seabirds recorded washed up on beaches in two incidents along the English Channel, covered in polyisobutene (PIB), has passed 4,000. Now, leading wildlife conservation and animal welfare charities and the UK Chamber of Shipping, supported by the wider industry body Maritime UK, have come together as a single voice to call for an urgent review of the hazard classification status of PIB.

The Maritime and Coastguard Agency (MCA) is currently investigating the cause and culprit of these incidents. If it is confirmed that this disaster was the result of illegal activity, the UK Government and the International Maritime Organisation should ensure there is no obstacle to prevent those responsible from being brought to justice. To date, however, no-one has been successfully prosecuted for illegally discharging PIB from ships in European waters.

Although not directly toxic to seabirds, polyisobutene becomes sticky when it comes into contact with seawater, coating the plumage of seabirds, restricting their movements and preventing them from feeding.

Currently, it is legal to discharge PIB in small quantities, based on certain conditions as set out by the international MARPOL Convention (International Convention for the Prevention of Pollution from Ships). However, the impacts of PIB on marine ecosystems, as well as the amount of PIB released routinely as part of legal shipping operations, are not well known or understood. 

Alec Taylor, marine policy officer for the RSPB, said: “The needless deaths of thousands of seabirds on our beaches has sickened and angered many people. With support from the shipping industry, we’re hoping that the UK Government can push for tighter regulations preventing the discharge of PIB into the sea for good.”

Pollution programme manager at the Marine Conservation Society, Dr Robert Keirle, said: “The International Maritime Organisation meeting this week must reclassify PIB as soon as possible under the International Convention on the Prevention of Pollution from Shipping.”

David Balston, director of safety and environment at the UK Chamber of Shipping, said: “Although no regulation can eliminate the possibility of illegal activity, we strongly support an urgent review to see how best to help prevent a recurrence of the recent deaths and injury to wildlife.”

Adam Grogan is a senior scientist with the RSPCA. He said: “It is fantastic that so many organisations are joining forces to campaign on this issue - it sends a clear message that something has to change and the discharge of this lethal substance must be banned.

“This had been one of the worst cases of marine pollution in recent memory – over 4,000 birds have suffered or died. Our staff have been working round the clock to try and help the casualties which could be saved, but many more washed up along our beaches were already dead.”

Joan Edwards is the head of The Wildlife Trusts’ Living Seas Programme. She said: “The marine wildlife around our shores is internationally important, but sadly it faces many threats. I have seen the carnage on the beaches and removing the pollution threat of this devastating substance is an easy win in the ongoing battle to safeguard the future of our marine environment.”

This call to action also comes at the start of the International Maritime Organisation (IMO)’s latest meeting of its environmental subcommittee, the group that would ultimately agree to a reclassification of PIB under the MARPOL Convention, should one or more member governments present a case. 


Download joint statement on PIB from UK Chamber and wildlife NGOs.

For further information and to arrange an interview, please contact:

  • Grahame Madge, RSPB media officer: 01767 681577 Out of hours: 07702 196902
  • Tony Whitehead, RSPB South West press officer: 01392 453754, 07872 414365
  • Gemma Wilkie, PR manager at the UK Chamber of Shipping on 020 7417 2834 or
  • Clare Fischer, editorial and media officer, Marine Conservation Society: 01989 561658
  • Joan Edwards, Head of Living Seas, The Wildlife Trusts, 01752 768995
  • Anna Guthrie, media & PR manager, The Wildlife Trusts, 01636 670075 / 07887 754659 or
  • Richard White, senior marine advocacy officer, Devon Wildlife Trust, 01392 279244
  • Katya Mira, senior press officer, RSPCA, 0300 123 0290

Download the UK Chamber's background briefing on polyisobutene

Editors’ notes:

Polyisobutene (PIB) is a man-made substance (or group of substances) used, for example, in the manufacture of chewing gum, adhesive tape and sealants. In its raw state, it is generally colourless or light yellow, odourless, tasteless and cannot easily be identified. It is also not biodegradable. Global consumption of liquid PIB is forecast to increase by around 40% by 2017 to 1.2 million tonnes per year, most of which is transported by ship. 

PIB is a hydrophobic substance, so on contact with water it coalesces into a waxy, glue-like formation, generally floating at or just underneath the surface. As such it is extremely hazardous to a range of seabird species which dive to find food (auks, such as guillemots, razorbills and puffins, as well as gannets, fulmars and shags are particularly vulnerable). The longer-term impacts of PIB releases on marine ecosystems are not well understood. 

The recent incidents (Jan/February and April 2013) add to a list of at least three other documented cases of mass seabird mortality in recent years in European waters caused by the release of PIB, of which the source was only found in one case (and that was found to be a legal discharge).

Under Annex II of the international MARPOL Convention, which regulates pollution from ships, PIB is classified as a “Category Y” substance. This means it is legal to discharge PIB outside 12 nautical miles under certain conditions. Tanks carrying PIB must be emptied and pre-washed onshore in port facilities with the use of water and cleaning chemicals, before remaining PIB residue can be discharged at sea, amounts varying according to the age of the ship. This legal discharge status, however, is primarily based on PIB’s persistent floating properties, with limited consideration of wider environmental impacts. 

A review of the classification of PIB should involve the testing of PIB in realistic marine conditions, including in combination with permitted cleaning agents, considering the potential long-term effects upon the wider marine ecosystem of regular small-scale releases. 

The reclassification of PIB to prevent its discharge would require all residues of PIB to be fully removed in port facilities. To achieve this, one or more member countries of the International Maritime Organisation (IMO), which oversees the MARPOL Convention, must present a case to the IMO’s Marine Environment Protection Committee (MEPC), for discussions that would ultimately allow for the reclassification of PIB. These meetings are held three times every two years.

The RSPB, RSPCA and The Wildlife Trusts wrote to Stephen Hammond MP, Under Secretary of State for Transport, on the 18th April, to call on the UK Government to initiate a review of PIB and call for a tightening of PIB’s discharge status under MARPOL. A response is still awaited. In the meantime, online petitions calling for the regulations on PIB to be tightened have been started on both the 38 Degrees and Avaaz websites, gathering more than 27,000 public signatures.

Notes on organisations involved:

The UK Chamber of Shipping is the trade association for the UK shipping industry, working to promote and protect the interests of its members both nationally and internationally. With around 140 members from across the maritime sector, the UK Chamber represents over 925 ships of about 30 million gross tons and is recognised as the voice of the UK shipping industry. 

Maritime UK brings together the shipping, ports and maritime business services sectors in the UK to speak with a single voice on key strategic and practical issues of joint interest.
The Marine Conservation Society (MCS) is the UK charity dedicated to the protection of our seas, shores and wildlife. MCS campaigns for clean seas and beaches, sustainable fisheries, and protection of marine life. 

The RSPB is Europe’s largest wildlife conservation charity with over one million members.The Royal Society for the Protection of Birds: press office telephone 01767 681577. Registered charity no 207076.

The Wildlife Trusts (TWT) 

Devon, Dorset and Cornwall Wildlife Trusts were each actively involved in response to incidents involving PIB in 2013; three of 47 individual Wildlife Trusts covering the whole of the UK. The Wildlife Trusts have than 800,000 members.