Leakage rate is an important indicator of the glove box. It refers to the speed at which air leaks into the glove box per unit time under a set pressure, usually under negative pressure. It is usually used as a percentage of the volume of the box that leaks per hour, that is *%/h to describe.
For example, if the pressure of the glove box is adjusted to -10mbar, and 3 liters of air leaks into a single-station glove box with a box volume of 750 liters within 4 hours, the leakage rate = 3 liters / 750 liters / 4 hours = 0.1%/hour. The air leakage rate of the general glove box is less than 0.05%/hour. This glove box is unqualified.