# Commission Implementing Regulation (EU) 2016/1821 of 6 October 2016 amending Annex I to Council Regulation (EEC) No 2658/87 on the tariff and statistical nomenclature and on the Common Customs Tariff, Division 4: For the purposes of heading 7019, the expression ‘glass wool’ means:

Extent: E+W+S+N.I.

(a) mineral wools with a silica (SiO2) content not less than 60 % by weight;
(b) mineral wools with a silica (SiO2) content less than 60 % but with an alkaline oxide (K2O or Na2O) content exceeding 5 % by weight or a boric oxide (B2O3) content exceeding 2 % by weight.
Mineral wools which do not comply with the above specifications fall in heading 6806.

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Source: https://www.legislation.gov.uk/eur/2016/1821/annex/I/part/TWO/division/1/section/XIII/chapter/70/annotations/1/annotation/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2016-1821/annex-I/part-TWO/division-1/section-XIII/chapter-70/annotations/1/annotation/4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.