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Does the "7" resin identification code on plastic mean they contain POLYSORB® isosorbide?

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No. It means that the resin does not belong to the other types of resin defined from categories 1 to 6 (PET, HDPE, PVC, LDPE, PP, PS). 

Other questions - About isosorbide

Are POLYSORB® isosorbide-based polymers considered as bio-based polymers?

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What can be considered as a POLYSORB® isosorbide derivative?

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Is POLYSORB® isosorbide suitable for polyester resin modification?

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What is the resin identification code (RIC) for isosorbide-based plastics?

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