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A comment on Tire Dust Makes Up the Majority of Ocean Microplastics. Parent comment

Re:Tire Dust Makes Up the Majority of Ocean Microplastics by spqr0a1 on Sunday October 01, 2023 @01:50PM (#37728488)
It's more than just the chain length. The most common synthetic rubbers are styrene-butadiene copolymers. Natural rubber is polyisoprene. While it is true that shorter chain synthetic polyisoprene is available, it is a much smaller part of the market than styrene-butadiene.
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Re:Tire Dust Makes Up the Majority of Ocean Microplastics by dpeckett on Sunday October 01, 2023 @02:50PM (#37729149)
Does look like both natural and synthetic polyisoprene is at-least somewhat biodegradeable: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC92035/
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