HG/T 3344-2012 "Determination of water absorption of paint films" specifies the method for determining the water absorption of paint films. When testing, the test plate is placed under the specified test conditions for water immersion test, and then the water absorption is indicated by the mass fraction of the increased paint film mass after immersion. The standard cites a number of specifications, including the requirements of Paints and varnish standard test plates, and the insulating paint film prepative method to ensure the accuracy and Reliability of the measurement. Electronic Balance with an accuracy of 0.1 mg is used during the test, as well as substrates and containers that meet the requirements of the standard.