What is the principle of anti-fog spray?
2 Answers
The principle of anti-fog spray is to utilize the hydrophilic groups in the formulation to adsorb water molecules in the air and reduce their surface tension, thereby decreasing the contact angle between water molecules and the surface of transparent objects. Before water molecules can form tiny droplets on the surface of the transparent object, they wet and spread across the surface, forming an ultra-thin transparent water film. This film no longer scatters incident light and does not interfere with vision, thus achieving an anti-fog effect. Below are the usage method of anti-fog spray and the reason why anti-fog spray becomes blurrier the more you wipe it: Usage method of anti-fog spray: Spray the anti-fog spray on the car glass and then wipe it clean to form a transparent protective film. This film can prevent water vapor from condensing into a fog layer on the glass, especially suitable for cold winters. Reason why anti-fog spray becomes blurrier the more you wipe it: After spraying the anti-fog spray, if you use a towel to wipe it, the anti-fog protective film on the laminated glass will be damaged, making it more likely for the anti-fog spray to become blurrier the more you wipe it. When this happens, the only solutions are to reapply the anti-fog spray or to ventilate the interior.
I often use anti-fog spray when driving in winter. It prevents the car windows from fogging up by forming a transparent film on the surface through the chemicals in the spray. This film reduces the surface tension of water, causing water vapor to spread evenly into a thin layer rather than forming droplets, thus maintaining clear visibility. I remember one heavy snow day when I used it, driving felt much safer and helped avoid potential accidents. This spray isn’t just for cars—it can also be used on bathroom mirrors or ski goggles at home. One application lasts for several days, saving the hassle of constant wiping. How convenient! When choosing a spray, it’s best to check the ingredients and opt for safe, non-toxic products. Avoid cheap, off-brand options as they might be harmful to the skin.
