GB/T 30648.1-2014 "Paints and varnishes - Determination of resistance to liquids - Part 1: Immersion in liquids other than water" specifies a method for determining the resistance of paint and varnish coatings to erosion when immersed in non-aqueous liquids (such as solvents, oils, chemical reagents, etc.). The test principle involves immersing coated specimens into specific test liquids and evaluating the appearance of the coating and the damage to the substrate according to agreed-upon standards. The specimens must be dried under standard conditions before evaluation. The test requires the use of corrosion-resistant glass or plastic immersion containers, a constant-temperature device with a temperature control accuracy of ±1°C, a coating thickness measuring instrument with an accuracy of 1 μm, and specialized drying equipment. This standard is applicable to the evaluation of the resistance of coatings to non-aqueous liquids in industrial and daily scenarios.