… Hard rubber (for example, ebonite) in all forms, including waste and scrap; articles of hard rubber. …
Explanatory notes
… Hard rubber (for example, ebonite) in all forms, including waste and scrap; articles of hard rubber. Hard rubber (for … silica. In the absence of fillers, pigments and cellular structures, hard rubber is a hard, brownish‑black (or … sometimes red) material which is relatively inflexible and inelastic and can be moulded, sawn, drilled, turned, …