ISO 633:2019 Cork一Vocabulary. This document defines cork as a raw material for the industry, as well as the terms to be used in describing the different forms in which cork can be found. This document also indicates the terms and definitions concerning its main products, some of the operations to which cork can be submitted and anomalies that can be associated with it. 2 Normative references There are no normative relerences in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www .electropedia.org/ 3.1 Cork 3.1.1 Constitution 3.1.1.1 cork protective layer of bark which, periodically, can be harvested from the trunk and branches of the cork oak (Quercus suber L.) constituting the raw material for cork products 3.1.1.2 layer vein suberous tissue produced during a one yearly growth cycle of the cork oak, comprising a highcolou red large softer band formed at the begin- fling of the year, the spring layer, and a thinner darkish band grown towards the end of that year, the autumn layer Note 1 to entry: The number of layers formed from the beginning of the cork’s growth determines the number of years of the cork bark, i.e. its “age”. 3.1.1.3 lenticel radial canals which allow essential gaseous exchanges between the tree tissues and the atmosphere 3.1.1.4 pore opening of the lenticels (3.1.1,3), in cross-section Note ito entry: The surface of the lenticels in cross- section is called porosity. This surface is taken into account when visually classifying the cork stoppers (3.4.13). 3.1.1.5 back outer side of the suberous tissue, in relation to the tree 3.1.1.6 belly inner side of the suberous tissue, in relation to the tree Note 1 to entry: The belly is only visible after stripping(3.1.1.8). 3.1.1.7 face surface of stripped cork (3.1.1.1) obtained in the cross direction to the back (3.1.1.5) and to the tree axis, except the back and belly (3.1.1.6)ISO 633 pdf download.
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