There are many methods to study the water resistance of scotch tape. The most commonly used method is to directly measure the absorption rate, water permeability and water vapor permeability of printing tape. In order to study and characterize the water resistance of pressure-sensitive adhesive, we can also measure the changes of water absorption and solubility of pressure-sensitive adhesive, initial viscosity of transparent tape, 180 peel strength and adhesion with soaking time in water or storage time in saturated steam environment, and further study and measure the differences of the above-mentioned pressure-sensitive adhesive properties of pressure-sensitive adhesive products in different relative humidity environments.

Water absorption is usually determined by gravimetric method. After soaking in water at a certain temperature or storing in an environment with a certain temperature and relative humidity for a certain period of time, accurately weigh the mass x of the transparent tape or pressure-sensitive adhesive sample to be tested. If the mass of the sample before testing is X 1, the absorption rate of the sample is: x-x1/x1*100%, and the unit is%.

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