New medical elastomers for body jewelry: separate **PP-R random copolymers** from **TPU** before you buy

BioFlex(R) and Bioplast are PP-R, not TPU, so flexible jewelry buying starts with resin chemistry, not marketing labels.

What the full article covers

• BioFlex(R) and Bioplast are PP-R random copolymers, not TPU, so they should not be treated as chemically equivalent to urethane-based flex materials.

• When a supplier calls a flexible product “medical grade,” ask for the base resin, ISO 10993 data, and any USP Class VI documentation before stocking it.

• For studios, the practical decision is not “flexible or not” but which chemistry matches the use case, anatomy, and wear duration.

• The strongest recent industry signal is that the market still confuses PP-R with TPU, which creates avoidable purchasing and counseling errors.

• If the claim is about biocompatibility, the supporting evidence must name the actual polymer family, not just a brand umbrella.

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First published on poliinternational.com. This is a summary of the original engineering article.