1, the most important is the indoor air humidity is high, placed in a dark and humid place. The packing belt will corrode in this kind of environment, and finally affect the use.

2, there is the finished product is not dry and warehousing, the product will be put into the warehouse after the volatile moisture inside it, not only its own products will be damaged, in its vicinity may also be corroded. 

3, the zinc layer condensation on the surface of a layer of water film, when the moisture content in the air reached 60% or in the 85~95% range, as well as ph<6, the corrosion reaction is more severe.