> ... the inside of the can is painted too — with a complex chemical called a comestible polymeric coating that prevents any of the aluminum getting into the soda.
I though this was very interesting, so I did a little digging... There is remarkably little information on these 'comestible polymeric coatings', but I was able to find (see below) a reason as to why that is. Apparently these coatings are propriety to the manufacturer and there are competing companies who are constantly in a race to find the best coating.
It's supremely interesting the fact that drinking a can of coke is almost a magic trick right in front of your eyes. It'd be like someone holding a lighter straight to a piece of paper and everyone being baffled as to why it isn't lighting on fire. Yet when someone drinks a coke no one bats an eye as to how it isn't mixing with the metal salts and eating straight through the aluminum can.
"Interior can coatings designed to prevent migration of metal salts into the contained product are called "comestible polymeric coatings". The coatings ars polymers typically used in coil coating. The exact nature of the coatings isn't available since most are proprietary to manufacturers who continuously look for better coatings."
I though this was very interesting, so I did a little digging... There is remarkably little information on these 'comestible polymeric coatings', but I was able to find (see below) a reason as to why that is. Apparently these coatings are propriety to the manufacturer and there are competing companies who are constantly in a race to find the best coating.
It's supremely interesting the fact that drinking a can of coke is almost a magic trick right in front of your eyes. It'd be like someone holding a lighter straight to a piece of paper and everyone being baffled as to why it isn't lighting on fire. Yet when someone drinks a coke no one bats an eye as to how it isn't mixing with the metal salts and eating straight through the aluminum can.
"Interior can coatings designed to prevent migration of metal salts into the contained product are called "comestible polymeric coatings". The coatings ars polymers typically used in coil coating. The exact nature of the coatings isn't available since most are proprietary to manufacturers who continuously look for better coatings."
source: http://www.eng-tips.com/viewthread.cfm?qid=258261