42 Important information about chemical protection gloves Symbols and protective effect explained simply Chemical resistant gloves must comply with the requirements of EN ISO 374. For this, testing includes permeation (EN ISO 374-1), penetration (EN ISO 374-2), degradation (EN ISO 374-4), and microbial resistance (EN ISO 374-5). The results for chemical resistance are provided in the product data sheet and the instructions for use. Permeation Permeation is defined as the breakthrough time until the chemical comes into contact with the skin. The permeation resistance of the protective gloves is subdivided into Types A, B, and C. Type A: Longer than 30 minutes for at least 6 test chemicals Type B: Longer than 30 minutes for at least 3 test chemicals Type C: Longer than 10 minutes for at least 1 test chemical Type A gloves therefore have the best resistance. Penetration Penetration refers to the entry of a chemical or a micro-organism through porous materials, seams, needle holes, or other damage locations in the glove material. When testing the penetration resistance of chemical protection gloves, neitherwater nor air may pass through them. Since the latest update of the standard in 2016 there are 18 test chemicals, each in a specified concentration, in order to depict as broad a spectrum as possible. The user selects a substance class which comes as close as possible to “his” chemical. Performance levels 1 to 6 derive from the breakthrough time [min]. The letters beneath the “Erlenmeyer flask” symbol indicate all chemicals for which a breakthrough time of at least 30 minutes was measured. Code letter Test chemical CAS No. Substance class „Chemex“ performance level from Kerbl A Methanol 67-56-1 Primary alcohol 2 B Acetone 67-64-1 Ketone C Acetonitrile 75-05-8 Nitrile D Dichloromethane 75-09-2 Chlorinated hydrocarbon E Carbon disulphide 75-09-2 Sulphurous organic compound F Toluene 75-15-0 Aromatic hydrocarbon G Diethylamine 108-88-3 Amine H Tetrahydrofuran 109-99-9 Heterocyclic and ether compounds I Ethyl acetate 141-78-6 Ester J n-Heptane 142-82-5 Aliphatic hydrocarbon 6 K Sodium hydroxide 40 % 1310-73-2 Inorganic base 6 L Sulphuric acid 96 % 7664-93-9 Inorganic acid 3 M Nitric acid 65 % 7697-37-2 Inorganic acid, oxidising 2 N Acetic acid 99 % 64-19-7 Organic acid 3 O Ammonia water 25 % 1336-21-6 Organic base 4 P Hydrogen peroxide 30 % 7722-84-1 Peroxide 6 S Hydrofluoric acid 40 % 7664-39-3 Inorganic acid 3 T Formaldehyde 37 % 50-00-0 Aldehyde 6 Power level 1 2 3 4 5 6 Breakthrough time (min) > 10 > 30 > 60 > 120 > 204 > 480 Type A: The glove is resistant to at least 6 test chemicals for more than30 minutes each. Test chemicals A, J, K, L, M, N, O, P, S, and T were tested. The breakthrough times for the chemicals are as shown below: • A and M (performance level 2) > 30 minutes • L, N, and S (performance level 3) > 60 minutes • O (performance level 4) > 120 minutes • J, K, P, and T (performance level 6) > 480 minutes Example: „Chemex“ chemical protection glove from Kerbl
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