EN 374-3



Resistance to Permeation:
Resistance to permeation is assessed by measuring the time for a chemical to break through the glove material. Samples, cut from the palms of the gloves are placed in a permeation cell which enables the chemical to be placed in contact with the outer surface of the glove. Collection air or water is passed through the cell to collect any chemical that has broken through to the inside surface of the glove samples.

The ‘Chemical resistant’ glove pictogram must be accompanied by a 3-digit code. This code refers to the code letters (A-L) of 3 chemicals (from a list of 12 standard defined chemicals as shown below), for which a breakthrough time of at least 30 minutes has been obtained.


Code letterChemicalCAS numberCategory
AMethanol67-56-1Primary alcohol
CAcetonitrile75-05-8Nitrile Compound
DDichloromethane75-09-2Chlorinated Paraffin
ECarbon Disulfide75-15-0Sulphur Containing Organic Compound
FToluene108-88-3Aromatic hydrocarbon
HTetrahydrofuran109-99-9Heterocyclic and Ethereal Compound
IEthyl Acetate141-78-6Ester
Jn-Heptane142-85-5Saturated hydrocarbon
KSodium hydroxide 40%1310-73-2Inorganic base
LSulfuric Acid 96%7664-93-9Inorganic Mineral Acid

Permeation: The process by which a chemical agent migrates through the protective glove at a molecular level (performance level 0 to 6). Performance levels are assessed according to the breakthrough times of the chemicals.

Measured breakthrough timePerformance LevelMeasured breakthrough timePerformance Level
> 10 minutesLevel 1> 120 minutesLevel 4
> 30 minutesLevel 2> 240 minutesLevel 5
> 60 minutesLevel 3> 480 minutesLevel 6