They take the pressure off of extending shelf life by preventing outgassing in aluminum and zinc paint.
Moisture chemically reacts with aluminum or other metallic pigments, causing hydrogen gas to form.
This gas pressure can cause bulging of tightly sealed paint cans. The finely divided metallic zinc in the paint reacts vigorously with trace moisture during the container shelf life, frequently leading to rapid and severe pressure build-up within the container. Co. All rights reserved.