Foam-structured vulcanized rubber articles — including open- and closed-cell sponge rubber components — fall here when not classified under a more specific heading. The cellular structure distinguishes these goods from solid rubber articles, affecting both compressibility specifications and end-use suitability in sealing, cushioning, and insulation applications across automotive, construction, and consumer goods sectors. Importers should confirm that the rubber has been vulcanized but not hardened (ebonite), as that distinction drives classification between competing headings.

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