The resistance of protective gloves against chemicals is based on two precepts:
a) penetration means the movement through the protective glove of a chemical substance through the imperfections of the material or through porosities and leaking seams.
b) permeation means the diffusion at a molecular level of a chemical substance through the material of a protective glove.
The permeation follows according to two criteria: the breakthrough time of the chemical substance and the permeation flux. The permeation flux refers to the quantity of the substance which passes through a protective glove, per surface and time unit. The permeation flux is sometimes more significant than the breakthrough time. In other words, one protective glove can permit the diffusion of a small quantity of substance after a short time, whereas another protective glove only allows diffusion after a longer time, but in a large quantity.
Therefore - if exposed to very toxic substances - it is essential to ask advice from the competent chemist. Specialists are available on request at the manufacturer of the protective gloves.