Definition - What does Breakthrough Time mean?
Breakthrough time, in the context of chemical exposure, refers to the time between when a harmful chemical liquid touches the outside of a glove or other personal protective equipment and when it breaks the surface to reach the skin.
Safeopedia explains Breakthrough Time
Breakthrough is said to occur when the permeation rate reaches 0.1 mg/m2/second. At this point, the gloves or other protective equipment is deemed to be inadequate protection.