Explanatory notes
… together, more than 50 % of the elements Mg, Ca or Cr, or expressed as MgO, CaO or Cr 2 O 3 6902.20 - Containing by … and tiles for flooring, walls, hearths, etc. The heading excludes tubing, piping (including runways in the form of … refractory materials ( heading 69.03 ). ° ° ° Subheading Explanatory Note. Subheading 6902.10 What has to be …