Abstract: Moisture barrier coating is a type of surface protective materials fabricated to prevent moisture penetration, and it is widely used in the packaging of products and apparatus susceptible to environmental moisture. Inorganic coating inevitably contains defects that are generated during fabrication and service, though they perform well in shielding against moisture due to their dense structures. Hence they are inadequate to serve as long-term barriers, because water molecules can pass freely through these defects. Polymer coatings are less effective compared with the inorganic ones in blocking small gas molecules, yet they own advantages of higher toughness and easier preparation. While integrated with inorganic coating, polymer coating can counteract the defects and greatly improve the moisture barrier performance and service life of the coating, obtaining a ‘1+1>2’ effect. Global researchers have made remarkable efforts in testing different combinations of coating materials and optimizing preparation conditions, which results in many profitable achievements in fabricating various coatings with excellent moisture barrier properties. In this paper, the working mechanisms of moisture barrier coatings and the latest research progress on the state-of-the-art preparation methods are summarized, while the challenges and development prospects in this field are discussed.
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