Barrier property testing of packages is one of the vital testing items for cosmetic packages. Barrier property is the definition for barrier effect of packaging materials against gas, liquid and other permeable substances. Barrier property is the important factor affecting product quality during shelf life period.

The unsaturated links in cosmetic ingredients are easy to be oxidized and deteriorated; the lost of moisture in the cosmetic would lead to hardening of cosmetics. Meanwhile, the fragrance of the cosmetics has great influence on the marketing of cosmetics. Barrier property testing includes the permeability testing of oxygen, water vapor and fragrant gas through cosmetic packages.