|11.1 Classification of goods by water content classes|
|The transport requirements of goods with regard to storage climate conditions in the container are largely determined by their water content and their resulting interaction with the humidity and temperature conditions of the ambient medium. The water content of a product is the percentage of its total mass which is constituted by water. Goods may therefore be classified by the following water content classes:
WCC = Water content classes
0 - Water content class 0 (WCC 0)
Products containing no water, e.g. glass, porcelain, ceramic fittings, metals, plastics.
1 - Water content class 1 (WCC 1)
Products containing only a little water (water content > 0 to ≤ 1.5%), e.g. crystalline and pulverulent products (sugar, salt, fertilizers, citrus powder); their adsorption isotherms are characterized by discontinuities.
2 - Water content class 2 (WCC 2)
Goods with a low water content (WC > 1.5 - ≤ 30%), e.g. goods from which water has been removed by natural or artificial drying, thereby extending storage life, such as most foodstuffs and semiluxury items, also raw materials of animal origin, natural fibers, coal, lumber, paper; their adsorption isotherms form a continuous, generally S-shaped, curve.
3 - Water content class 3 (WCC 3)
Goods with a high water content (WC > 30%), including fruit, vegetables, meat and fish, with a water content of > 90%, which have a tendency to release water vapor (water vapor release) into the storage atmosphere. This group also includes goods, such as rafted wood or wet-salted hides (which under normal conditions belong to WCC 2).
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