Explanatory notes
… of metal or of a chemical compound (for example, metal oxide) which absorbs, for example, infra-red light or … means : (a) Mineral wools with a silica (SiO 2 ) content not less than 60 % by weight; (b) Mineral … silica (SiO 2 ) content less than 60 % but with an alkaline oxide (K 2 O or Na 2 O) content exceeding 5 % by weight or a …Legal note
… of metal or of a chemical compound (for example, metal oxide) which absorbs, for example, infra-red light or … means : (a) Mineral wools with a silica (SiO 2 ) content not less than 60 % by weight; (b) Mineral … silica (SiO 2 ) content less than 60 % but with an alkaline oxide (K 2 O or Na 2 O) content exceeding 5 % by weight or a …