Breakthrough time

Breakthrough time is a practical way to estimate how long protective equipment will last against a specific chemical. A glove with a short breakthrough time for a solvent gives little protection if the task involves more than a brief splash, while a longer time suggests it can be used for longer jobs. The figure comes from standardized tests run by manufacturers or independent laboratories, and the numbers differ by chemical, thickness and material.

The time is not a guarantee that the glove remains safe until that moment. Test conditions are controlled: a particular temperature, continuous contact and a new, undamaged sample. In real work, heat, flexing, abrasion, mixtures of chemicals and previous use can make a glove fail sooner. Many safety professionals therefore apply a safety margin and replace gloves well before the published time.

Breakthrough is related to, but not the same as, Permeation. Permeation is the process of molecules moving through the material at a molecular level; breakthrough time is the point at which that movement first becomes detectable. After breakthrough, the rate of permeation can continue to rise, so exposure increases the longer the glove stays on.

Where data are not available for a chemical or a mixture, ask the manufacturer or choose a more protective option. Do not assume that one result applies to different formulations. The information supports the choice of Chemical-resistant gloves and other Personal protective equipment (PPE).