16 11 04 Other linings and refractories from metallurgical processes other than those mentioned in 16 11 03 - Mirror non-hazardous
16 11 04 Leininau a gwrthsafiadau eraill o brosesau metelegol ac eithrio'r rhai a grybwyllir yn 16 11 03 - Drych nad yw'n beryglus