Kurk, 'n kurkspesie, is moeilik om aan te pas by hoë hoogte en hoë temperatuur klimate en groei oor die algemeen in berge en woude op 'n hoogte van 400-2000 meter in subtropiese en gematigde klimaatsones. Kurkbronne kan gevind word in bergagtige gebiede binne die reeks van 32 tot 35 grade noordbreedte wat aan die geografiese en klimaatstoestande voldoen. Byvoorbeeld, Portugal, Spanje, Suid-Frankryk, die Qinba-berge in my land, suidweste van Henan en Algerië. Portugal is the world's largest exporter of cork and is known as the “Cork Kingdom” because of its unique Mediterranean climate, which is suitable for the growth of cork raw materials. At the same time, Portugal is one of the earliest countries in the world to develop cork resources, export raw materials, and process products. Algeria's cork production ranks among the top in the world. [2] The Qinba Mountains in Shaanxi Province, my country, also contain rich cork resources, accounting for more than 50% of the country's cork resources. Therefore, Shaanxi is known as the “Cork Capital” in the industry. Relying on this resource advantage, large domestic cork manufacturers are mainly concentrated here. Cork is composed of many flat cells arranged radially. The cell cavity often contains resin and tannin compounds, and the cells are full of air, so cork often has color, light and soft texture, elastic, impermeable, not easily affected by chemicals, and is a poor conductor of electricity, heat and sound . It is composed of dead cells in the form of 14 faces, which are arranged radially in hexagonal prisms. The typical cell diameter is 30 microns and the cell thickness is 1 to 2 microns. There are ducts between cells. The interval between two adjacent cells is composed of 5 layers, two of which are fibrous, followed by two layers of cork, and a layer of wood in the middle. There are more than 50 million cells in every cubic centimeter.