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Sealing technology manual for the process industry - Storage conditions

To meet these requirements, all container, cover and pack- aging materials must be free of substances that have a degradation effect on elastomers. Therefore, primarily PE-coated kraft paper, aluminum foil or opaque polyethyl- ene film (minimum thickness 0.075 mm) are used. The storage and the recording of the time in storage of vul- canized rubber products are described in ISO 2230. In this standard, the elastomer products are divided into three groups to which different storage times are assigned. Articles made of rubber are subject to aging. Modern elas- tomer materials are more stable and have longer service lives than their predecessors from earlier generations, both regarding the base rubber and also as a result of suitable mixing additives. The aging process depends largely on the following factors: • Temperature • Thermal radiation • Solar radiation • Humidity • Relative air humidity • Ozone and ionizing radiation • Stress condition of the component Rules for the storage of elastomer products can be derived from this: 1.The storage temperature must be below +25 °C (+77 °F) 2.There must be no direct heat sources in the storage area 3. The seals must not be exposed to direct sunlight 4.Exposure to ozone and ionizing radiation must strictly be excluded 5. The seals must be stored without stress, as far as possible 6. The relative air humidity has to prevent condensation in case oftemperaturechangesinthestoreroom STORAGE CONDITIONS GROUP MATERIALS STORAGE PERIOD IN YEARS EXTENSION PERIOD IN YEARS 1 NR, AU, EU, SBR 5 2 2 NBR, HNBR, XNBR, ACM, AEM, ECO, CIIR, CR, IIR 7 3 3 FKM, FFKM, VMQ, PVMQ, FVMQ, EPDM, Fluoroprene® XP, CSM 10 5 APPENDIX PRODUCT PORTFOLIO MATERIALS RESISTANCE & PURITY ENGINEERING PLASTICS ELASTOMERIC MATERIALS TECHNICAL FUNDAMENTALS INTRODUCTION 25 1 NR, AU, EU, SBR 52 73 105

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