… stone, of a kind commonly used for concrete aggregates, for road metalling or for railway or other ballast, shingle and flint, whether or not heat-treated; macadam of slag, dross or similar industrial waste, whether … incorporating the materials cited in the first part of the heading; tarred macadam; granules, chippings and powder, of …
Explanatory notes
… stone, of a kind commonly used for concrete aggregates, for road metalling or for railway or other ballast, shingle and flint, whether or not heat‑treated; macadam of slag, dross or similar industrial waste, whether … (e.g., by fusion of a mixture of minerals) e.g., for addition to road surfacing materials, to improve hardness, …