Crumb rubber and granules derived from scrap rubber, including tire-derived material, classify under 4004 (subheading 400400) as powders and granules obtained from rubber waste. The heading covers the derived material regardless of the original article's form.

Waste and scrap of hard rubber (ebonite) falls outside 4004 and is classified under the hard rubber heading. The exclusion is explicit in the heading text, so importers should confirm whether the material meets the hardness criteria before applying 4004.