Metal products require protection from corrosion during transit and storage, for which generally Polyethylene film containing special additives, called Volatile Corrosion Inhibitor (VCI), is used. VCI film contains volatile chemicals and gets deposited on the surface of metallic products to prevent corrosion. The major sectors that need such film are: automotive, defence, electrical and electronic.

Earlier, Nitrites were used for VCI film. However, findings indicate that Nitrites are carcinogenic, hence their usage has been discontinued. Currently, the variants of Nitrites are used in VCI film. These additives are quite expensive and are difficult to incorporate in the film. Hence VCI film is a speciality product, sold at approximately US$5/kg. Such VCI film is available as a bag or in the form of shrink film. Due to the dangers of damage to the environment and potential risk of cancer from few of the volatile additives, another technology, originally developed by Bell Laboratories, USA is used. This technology is based on barrier materials, with copper being used as the moisture barrier. However, currently, VCI film has a higher market share of this application. The barrier film could provide better and longer protection but at a higher cost as compared to VCI film. This speciality film requires significant care during manufacture of PE films using a VCI masterbatch. The handling of VCI masterbatch requires clear understanding of its hazards. Respiratory mask and other protection gear are essential for handling the masterbatch. VCI film, though not as sensitive, require handling by gloves and good ventilation in the plant.

More information about VCI film can be obtained from its major manufacturer called Cortec Corporation, St Paul, USA.