In order to preserve the quality of zinc from VMZINC, the following recommendations should be strictly respected:
- Sheets and coils must be stored in a well-ventilated, sheltered and dry warehouse, with a constant temperature so as to avoid condensation build-up.
- Sheets and coils must be separated from the ground by a pallet, which allows sufficient air space for the correct ventilation of the products.
- In order to avoid deformation of the metal, sheets must be stored flat on the pallet.
- When coils are shipped, they may be placed either on their horizontal axis or vertical axis, depending on the client's request. It is recommended that the coils be stored in their original packaging.
If coils are to be stacked due to lack of storage space, the following recommendations must be respected:
- If the coils are delivered on their horizontal axis, the pallets must be stored in their original packaging, and preferably individually on separating racks;
- If the coils are delivered on their vertical axis, the pallets may be stored on top of one another, up to a maximum of 4 pallets for reasons of stability.
Storage time for sheets and coils must be as short as possible, especially on the building site. If the zinc is mishandled, folds or "bumps" can form. Cracks may occur in these places years later. Due to the effects of expansion and contraction, deep scratches can cause cracks either during forming or after installation.
Storage and ventilation
The phenomenon of "white powder" has absolutely no connection with the formation of a natural patina. If there is no ventilation (poor storage, transportation or installation conditions), zinc hydroxide which is powdery, non-adhesive and non-protective, is formed. This phenomenon prevents the formation of the natural protective patina and the zinc corrodes more easily.