What does a Sorona consist of?

 If 37% of Sorona is made from renewable sources, what is the other 63% made from?

Other components (monomers) are currently made from petrochemical raw materials. Sorona's renewable resource derived component: bio-based PDO, polymerized with DMT(dimethyl terephthalate) or TPA(terephthalate) to form Sorona polymer. At present, both DMT and TPA are derived from petrochemical feedstocks.

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