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Automobile antifreeze serves to prevent freezing in winter, stopping the coolant from freezing and thus causing the radiator to crack or the engine to be damaged； In the summer, antifreeze serves a cooling function by removing excess heat from the engine, regulating the temperature of its metal components, and preventing the engine from overheating. But what is the method for testing the freezing point of antifreeze? How to choose antifreeze for your car? Next, the editor will take you to learn about: freeze resistance testing. The freezing point test is a test of the antifreeze’s ability to function in cold weather. A freezing point tester can be used; it relies on the principle of specific gravity to indicate the freezing point, making it convenient to use. The most direct way to determine the quality of antifreeze is by testing its freezing point and boiling point. Generally, the freezing point of ordinary antifreeze can reach as low as -40°C, while high-quality antifreeze can achieve around -60°C. The boiling point of water is 100°C, while antifreeze should be able to withstand at least 110°C. The lower the freezing point of antifreeze and the higher its boiling point, as well as the greater the temperature difference, the better its quality. Conversely, the smaller the temperature difference, the relatively lower the quality of the antifreeze. Testing the freezing point of ice requires the use of a tester to conduct the test. The operation method for the freezing point apparatus is as follows: lift the cover and use a soft flannel cloth to wipe the surface of the cover and the prism clean ； Use a pipette to drop the liquid to be tested onto the surface of the prism, close the cover and press it gently, point the refractometer toward a bright light source, rotate the eyepiece until the scale lines in the field of view are clear, and then read the value corresponding to the boundary between light and dark on the scale on the marking plate ； After testing, wipe the surface of the prism and the cover with flannel, clean the tube, and return the instrument to its packaging box.