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Ingredient · Adhesive / resin

Styrene/butadiene copolymer

Mixed · 6/10, higher is cleaner

How we reached this

Synthetic rubber polymer used as elastic in diaper leg cuffs. FDA-permitted indirect food contact (21 CFR 177). High molecular weight = not dermally absorbed. Concern is end-of-life: not biodegradable, contributes to landfill polymer load.

Sources · 1

Also listed as

Styrene/butadiene copolymer (hydrogenated)

Products containing this · 4

About this rating

Ratings run 1–10, higher is cleaner, and are set editorially against the sources above — see the methodology page for how an ingredient rating becomes part of a product score. Last reviewed 2026-05-25.