The EN 374-3 norm concerns to the determination of the material resistance that constitute the protection gloves against non-gaseous chemical products potentially dangerous in case of continuous contact. It’s convenient to insist, therefore, in the fact that this test does not considers the susceptible conditions of appearing in service and it’s recommended to not use the test results, that has a relative values, it’s more to buy materials in function of the great categories of weather and impermeability. Demanding Level: 1st level: 0 to 1 – Penetration: indicates that the product can or can not resist to penetration of water and air. 2nd level: 0 to 6 – Permeability: Indicates the time that a dangerous product needs to cross the protective pellicle by permeability.