43 Degradation Permanent contact with the chemicals modifies the glove’s physical characteristics, causing flaking, break-up, hole formation, hardening, and discolouration, for example. This process is known as degradation. Protection against micro-organisms Gloves certified according to EN ISO 374-5 protect the user from bacteria and fungi. If the glove also protects against viruses, then “VIRUS” is displayed next to the pictogram. The glove protects against bacteria, fungi, and viruses. Instructions for correct use 1. Storage: Ideally in a cool (5 - 30°C), dry location free from direct sunlight, in order to prevent premature ageing. 2. Before use: Remove jewellery and trim fingernails if necessary; check gloves for possible damage, and do not use if defective. 3. Putting on: For longer protective gloves, roll back the cuff, so that the chemical does not run into the gloves. 4. Working: The chemical resistance can vary when mixtures of chemicals are present. Temperature, wear, or degradation also affect the actual protection period. 5. Pulling off: When pulling the contaminated gloves off, the user should ensure that they do not come into contact with unprotected skin. The chemical manufacturers’ safety datasheets and the protective glove’s instructions for use contain further useful information about use and disposal. The glove protects against bacteria, fungi and viruses. The test result is stated as a percentage deterioration. The values can therefore be positive (material has become weaker after the effect of the chemical) or negative (material has become stronger after the effect of the chemical). Example: Chemex chemical protection glove EN ISO 374-4 – Resistance against degradation by chemicals Chemical Percent deterioration (%) Methanol (A) 41,8 n-Heptane (J) 14,0 Sodium hydroxide 40 % (K) -19,3 Sulphuric acid 96 % (L) 43,5 Nitric acid 65 % (M) 36,4 Acetic acid 99 % (N) 24,5 Ammonia water 25 % (O) -10,8 Hydrogen peroxide 30 % (P) -0,2 Hydrofluoric acid 40 % (S) x Formaldehyde 37 % (T) -7,0 Example: „Chemex“ chemical protection glove: Contact with methanol, n-heptane, and sulphuric, nitric, and acetic acids has weakened the material (nitrile) of the “Chemex” glove. In contrast, contact with sodium hydroxide, ammonium hydroxide, hydrogen peroxide, and formaldehyde has hardened the material. Hydrofluoric acid was not tested (X). Example: „Chemex“ model chemical protection glove from Kerbl The glove has microbial resistance to bacteria and fungi.
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