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It might be that Mr. Bordynuik understands he will have a problem with oxygen-containing plastics just like everyone else using pyrolysis, probably thanks to his education via the message boards.
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Or, it is much more likely that to get the initial permits for a new technology you start with the simple case, especially when he knows that he has a ready supply of hydrocarbon only plastics.
Once permitted and having demonstrated successful operation, getting permit modifications will be easier and can be done while the system is in operation producing income.
I'm pretty sure if you look back over the information available you will find where IsleChem has looked at other plastic types running through the system.
There's none so blind as he who will not see.