Industrial shaft seals

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gab.ru Product Берг data АБ – General bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22 Storage and handling of seals General The following guidelines for the storage and cleaning of seals are valid for natural and/or synthetic rubber elastomer materials and correspond to those standardised in ISO 2230 – 1973 and DIN 7716. DIN 9088 – Aerospace: guidelines for the permissible storage times of elastomer products - should also be observed. The following stipulations to DIN 7716 in respect of storage facilities and actual storage are valid for long-term storage. For shorter periods (up to 6 months), e.g. in production or delivery stores with a continuous flow of materials, these recommendations can be applied, except for those relating to the storage facilities and temperature; there should, however, be no detrimental change to the appearance or function of the products. Under unfavourable storage conditions or through improper handling most products of natural or synthetic rubber will change their physical properties. This can lead to a shortening of life, or the products may be rendered unusable, for example, as a result of hardening or softening, permanent deformation, peeling, cracks or other surface damage. These changes can be brought about by the influence of oxygen, ozone, heat, light, moisture, solvents etc. or by storing the products under stress or load. Properly stored elastomer products, on the other hand, generally retain their properties virtually unchanged for several years. Store The actual store should be cool, dry, moderately ventilated and there should be little dust. Outdoor storage without protection is not permitted. The appropriate storage temperature depends on the elastomer concerned. The most favourable storage temperature for synthetic rubber seals is in the range +15 to +25 °C. Higher temperatures must be avoided as well as lower temperatures. Elastomer products which have been subjected to low temperatures during transport or storage may have become stiff. They should, therefore, be allowed to warm up and be kept at a temperature of at least +20 °C before being used. Preferably, this should be done before they are unpacked to avoid condensation on the products themselves. In heated storage rooms the products should be shielded from the heat source. There should be at least 1 m between the packages and the source of heat. Where a heater with fan is used, the distance should be greater. Storage in damp rooms should be avoided because of the risk of condensation. A relative humidity of under 65 % is best. The seals should be protected from light, particularly from direct sunlight or artificial light with a high proportion of UV radiation. Any windows in the store should, therefore, be covered with a red or orange coating (never blue). Ordinary light bulbs are to be preferred for illumination. The seals should be wrapped or stored in airtight containers or otherwise be protected against atmospheric changes and particularly against draught. This is especially important for products which have a surface that is large in relation to the volume. As ozone is particularly damaging, steps should be taken to see that no ozone is produced in the store e.g. as a result of using electric motors or other equipment which can produce sparks or other electric discharges. Combustion fumes and vapours which can produce ozone as a result of photochemical processes should be exhausted. For this reason solvents, fuels, lubricants, chemicals, acids, disinfectants etc. should not be stored in the same room as the seals. gab.ru 44 Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22
gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, Industrial факс shaft seals (495) 22 It should be observed that elastomer products should not be subjected to tension, compression or other forms of loading in storage, as these can produce permanent deformations and cracks. Seals should therefore not be hung on hooks during storage. Certain metals, especially copper and manganese, damage elastomer products. Contact with these metals should thus be avoided and the seals should be covered with layers of paper or polyethylene to prevent such contact. In case it is necessary to repack the seals, packaging and covering materials should not contain substances which are damaging the seals, e.g. copper or alloys containing copper, petroleum, oil etc. The packaging materials should not contain softeners. If the products are powdered, then the powder must not contain damaging substances. Suitable powders are talcum, chalk, finely divided glimmer and rice starch. Seals which are made of different materials should not be in contact with each other. This is particularly important where the seals have different colours. Seals should be stored for as short a period as possible. Where long-term storage is involved, care should be taken to see that newly arrived products are kept separate from those already in storage. Cleaning and maintenance Elastomer products should be cleaned, if necessary, using warm soapy water (not above 30 °C) and allowed to dry off at room temperature. Solvents such as trichloroethylene, carbon tetrachloride or hydrocarbons should not be used, nor should sharp-edged objects, wire brushes, emery cloth or sandpaper. Elastomer/metal combinations can be cleaned using a 1:10 mixture of glycerine in alcohol. gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 45 22
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Industrial shaft seals

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