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Ingredient · Adhesive / resin

Styrene/isoprene copolymer

Mixed · 6/10, higher is cleaner

How we reached this

Hot-melt adhesive polymer used in diaper construction. FDA approves for indirect food contact (21 CFR 177). High MW = not dermally absorbed. Same end-of-life concern as styrene/butadiene copolymer.

Sources · 1

Products containing this · 3

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.