Aluminium cans and the ocean - advice from an Ocean Crusader

by Ian Thomson on 17 Sep 2015 Advice from the the founder of OceanCrusader founder Ian 'Thommo' Thomson. Thommo is an Australia sailing and diving instructor, who worked in the tourism industry on the Great Barrier Reef for a long time, skippering maxi yachts taking tourists on multiday sailing and diving adventures, where he met his now wife Swedish born Annika Fredriksson.

Ian founded Ocean Crusaders, has twice sailed around Australia solo (thats more than 6,000 nautical miles a time) and in 2010 after smashing the world record for the fastest solo circumnavigation of Australia by a massive 26 days. He used this record to launch the campaign and in turn raising his profile in the community so he could go and speak with people around the world on the issues our oceans are facing.

His passion for the ocean and it’s creatures comes from being on the water and in the water most of his working life. Recovering dead turtles that have died from plastic bag ingestion brings him to tears yet he uses these images and memories to drive this campaign to ensure that no more end up with the same fate.

He and Annika moved to Darwin on Australia's northern coast, both with commercical marine tickets and saved funds to embark on their latest crusade.

The duo are currently in Almeria Spain, tonight they will head out to Lanzarote aboard their Dufour 43, thence across to Caribbean and eventually to the Pacific.

Today we republish a recent article by Ian on the matter of aluminium cans. Note that is the English spelling, the first successfully extracted from ore in 1825 by Danish chemist Hans-Christian - it was called aluminum, which is what its called and spelt in the America's.

But back to Thommo article...

'I was asked the other day about throwing aluminium cans in the ocean. The question came about as the person concerned has been on racing yachts and an ongoing argument was about whether it was O.K or not to throw an aluminium can overboard. The person asking me was against it by the way. The argument also included a version that it is O.K to throw it overboard as long as you tear it in two as that way the lining of the can is broken and hence it will rust away quicker.

Before I answer the questions, lets first of all look at the humble Aluminium can. What is it? Well we have to go back to 1929 to find the technicians at the Aluminium Can Company trying to find a solution for canning beer.

This was courtesy of Anheuser-Busch and Pabst who wanted their beer in a can. The researchers kept coming up with a problem that the beer would eat into the liner of the can. Beer has a strong affinity for metal, causing precipitated salts and a foul taste.

The brewers called the condition “metal turbidity”. The American Can Company produced the flat or punch top can in 1934. The lining was made from a Union Carbide product called “Vinylite”, a plastic product which was trademarked “keglined” on September 25, 1934.

So the fact is that an aluminium can actually contains plastic. It is illegal under MARPOL regulations to throw plastic in the ocean all around the world.

Plastic coating inside and outside can hold it together for a lot longer than normal aluminium will last.

In addition to this, all cans these days are coloured with logos to make sure branding is seen by the public. This branding is made of toxic inks and are also lined with a very thin plastic exterior.

So the humble aluminium can is not 100% aluminium. It contains plastic which we are aware that every piece of plastic that has ever been created still exists in some form.

Let’s take it another step, the question was asked by a yachtie with regards to racing yachts in particular. ISAF Racing Rules of Sailing, Rule 55 Trash Disposal states ‘A competitor shall not intentionally put trash in the water’. Hence it is not only illegal under MARPOL regulations, there is a case to say that if a competitive boat got footage of you throwing a can, or a cigarette butt, or any other trash from your boat, they can protest you. Imagine getting to the end of the Sydney to Hobart and you have won your division, only to get protested out for throwing trash in the ocean. It could happen.

Another question asked was whether a can takes longer to degrade in landfill or the ocean? In the ocean it will take up to 200 years, yet the plastic will remain in the ocean forever. I can’t give you the time it will take in landfill but the correct answer to this is that aluminium cans should not end up in landfill, they should be recycled. Aluminium is arguably the best material for recycling as it doesn’t take a lot of processes to become raw aluminium again. The cans are thrown in a furnace where the toxins are burnt (fumes filtered and hence no toxins released into the atmosphere) and the molten aluminium is returned to its raw form where it can be made into more cans or containers, or maybe even a boat.

When I launched Ocean Crusaders back in 2010 it was on the back of finding dead turtles in the Whitsundays. One of those turtles I returned to Marine Parks and it was dissected to find out what had killed it. It was found to have a plastic bag form perfectly in its stomach so that everything it ate went straight into the bag. Contents of the bag revealed the usual sea grass and corals, however amongst the grass were 12 cigarette butts, a water bottle cap and half a Coca-Cola can. Any debris in the ocean, no matter how quickly it will degrade, has the potential to kill marine life.

The easiest answer to the original question is this…..Clean oceans make us all winners.

Ocean Crusaders are out to make a difference to the way we treat our oceans. Our Free Online education program teaches youth of the issues our oceans are facing and how people can make a difference in their everyday lives.