Standard EN ISO374-1, protective gloves against chemicals and micro-organisms, specifies the performance requirements required for gloves for protecting users against chemical products and/ or micro organisms and defines the terms to be used:
• Penetration (tested as per standard EN374-2): Diffusion of water or air, to check the impermeability, on a non-molecular level, of a chemical product and/or micro-organism through the porosities, seams, micro-holes or other imperfections present in the material of the protective glove.
• Degradation (tested as per standard EN374-4): Determination of the physical resistance of materials to degradation after continuous contact with hazardous chemicals.
• Permeation (tested as per standard EN374-3 or EN16523): Process by which a chemical product diffuses through the material of a protective glove, by continuous contact, on a molecular level. The EN ISO version of standard 374-1, introduces the concept of three types of protection against the permeation of chemicals:
- Type A: The glove gives a performance index to permeation at least equal to 2 for 6 chemical test substances taken from the list of chemicals specified in the standard.
- Type B : The glove gives a performance index to permeation at least equal to 2 for 3 chemical test substances taken from the list of chemicals specified in the standard.
- Type C : The glove gives a performance index to permeation at least equal to 1 for 1 chemical test substances taken from the list of chemicals specified in the standard.
|
LETTER
CODE
|
CHEMICAL PRODUCT |
N°CAS |
| A |
Methanol |
67-56-1 |
| B |
Acetone |
67-64-1 |
| C |
Acetonitrile |
75-05-8 |
| D |
Dichloromethane |
75-09-2 |
| E |
Carbon disulfide |
75-15-0 |
| F |
Toluene |
108-88-3 |
| G |
Diethylamine |
109-89-7 |
| H |
Tetrahydrofurane |
109-99-9 |
| I |
Ethyl acetate |
141-78-6 |
| J |
n-Heptane |
142-82-5 |
| K |
Caustic soda 40 % (NaOH or sodium hydroxide) |
1310-73-2 |
| L |
Sulphuric acid 96 % |
7664-93-9 |
| M |
Nitric acid 65% |
7697-37-2 |
| N |
Acetic acid 99% |
64-19-7 |
| O |
Ammonium hydroxide 25% |
1336-21-6 |
| P |
Hydrogen peroxide 30% |
7722-84-1 |
| S |
Hydrofluoric acid 40% |
7664-39-3 |
| T |
Formaldehyde 37% |
50-00-0 |
| PASSAGE TIME MEASURED (MN) |
PERFORMANCE INDEX TO
PERMEATION |
| > 10 mn |
1 |
| > 30 mn |
2 |
| > 60 mn |
3 |
| > 120 mn |
4 |
| > 240 mn |
5 |
| > 480 mn |
6 |