Products may be divided into the following water content classes on the basis of their water content:
| Water content class |
Description |
| WCC 0 |
Products containing no water (water content = 0%), e.g. glass, porcelain, ceramic fittings, metals, plastics |
| WCC 1 |
Products containing only a little water (water content = 0 - 1.5%), e.g. crystalline and pulverulent products (sugar, salt, fertilizers, citrus powder); their sorption isotherms are characterized by discontinuities. |
| WCC 2 |
Goods with low water content (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 also raw materials of animal origin, natural fibers, coal; their sorption isotherms form a continuous, generally S-shaped curve. |
| WCC 3 |
Goods with a high water content (> 30%), including fruit, vegetables, meat and fish, with a water content of > 90%, which have a tendency to release water vapor 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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