{"id":17767,"date":"2026-05-01T10:10:20","date_gmt":"2026-05-01T08:10:20","guid":{"rendered":"https:\/\/lindemannsilikon.de\/2026\/05\/01\/chemische-bestaendigkeit-silikon-oder-epdm-fakten-tests-2\/"},"modified":"2026-05-01T10:10:20","modified_gmt":"2026-05-01T08:10:20","slug":"chemische-bestaendigkeit-silikon-oder-epdm-fakten-tests-2","status":"publish","type":"post","link":"https:\/\/lindemannsilikon.de\/en\/2026\/05\/01\/chemische-bestaendigkeit-silikon-oder-epdm-fakten-tests-2\/","title":{"rendered":"Chemical Resistance: Silicone or EPDM? Facts & Tests"},"content":{"rendered":"

The Relevance of Chemical Resistance of Elastomers: A Detailed Analysis<\/h1>\n

Introduction<\/h2>\n

The chemical resistance of elastomers plays a crucial role in numerous industries, particularly in those where rubber and rubber-like materials come into contact with chemical substances. ASTM D471 is an international standard that aims to evaluate the effects of different liquids on the physical properties of elastomeric materials. This test is of great importance for selecting potential materials for applications such as seals, hoses, and membranes, which are essential in many industrial processes.<\/p>\n

Objective & Significance<\/h2>\n

ASTM D471 provides a systematic approach to investigating and evaluating the chemical resistance of elastomers. The significance of this investigation is evident in the following aspects:<\/p>\n

    \n

  1. Prevention of Material Failure:<\/strong> By understanding how different chemicals affect materials, potential failures and associated costs can be avoided.<\/p><\/li>\n

  2. Increased Product Safety:<\/strong> In applications such as the food or pharmaceutical industry, product safety is of utmost importance. Careful material selection contributes to product safety.<\/p><\/li>\n

  3. Extended Component Lifespan:<\/strong> Chemical resistance leads to greater stability and longevity of components, which is beneficial for operating costs.<\/p><\/li>\n<\/ol>\n

    Test Methods (ASTM D471)<\/h2>\n

    The method for testing chemical resistance involves the following steps:<\/p>\n

      \n
    • Sample Preparation:<\/strong> The geometry of the samples is standardized, and the materials are cleaned and weighed.<\/li>\n
    • Selection of Test Liquid:<\/strong> Various liquids, such as water, oils, and chemicals, are used depending on the application.<\/li>\n
    • Testing:<\/strong> Samples are stored in the respective liquid for a specified period and at defined temperatures.<\/li>\n
    • Measurement:<\/strong> After exposure, physical properties such as volume change, mass change, hardness, tensile strength, and elongation are analyzed.<\/li>\n
    • Evaluation:<\/strong> Changes in properties are documented and evaluated.<\/li>\n<\/ul>\n

      Results Table (12 Chemical Groups)<\/h2>\n

      The table below shows exemplary results of a study on the chemical resistance of various materials according to ASTM D471.<\/p>\n

      | Medium | Volume Change (%) | Mass Change (%) | Hardness Change (Shore A) | Tensile Strength (%) | Remarks |\n|————————|——————-|—————–|—————————|———————-|———————|\n| Water | +2.5 | +0.8 | -2 | -3 | Slight swelling |\n| Mineral Oil | +15 | +10 | -10 | -25 | Significant swelling|\n| Hydraulic Oil | +12 | +8 | -8 | -20 | |\n| Diesel Fuel | +18 | +12 | -12 | -28 | |\n| Bioethanol | +7 | +6 | -5 | -15 | |\n| Acid (pH 2) | +4 | +1.5 | -3 | -8 | Chemical resistance |\n| Alkali (pH 12) | +3 | +1 | -2 | -6 | |\n| Acetone | +50 | +40 | -25 | -50 | Severe damage |\n| Toluene | +45 | +35 | -20 | -45 | |\n| Silicone Oil | +3 | +2 | -1 | -4 | |\n| Ethylene Glycol | +6 | +4 | -4 | -10 | |\n| Cleaning Solution | +5 | +5 | -4 | -12 | |<\/p>\n

      Note: Values are average examples and may vary depending on rubber type and test conditions.<\/em><\/p>\n

      Analysis of Mechanisms<\/h2>\n

      The reactions of elastomers to chemical media can be divided into various mechanisms:<\/p>\n

        \n
      • Diffusion and Swelling:<\/strong> Liquid molecules penetrate the rubber structure and cause the polymer chains to stretch.<\/li>\n
      • Plasticizer Extraction:<\/strong> Organic solvents and oils can extract plasticizers from the elastomer matrix, leading to hardening and embrittlement.<\/li>\n
      • Chemical Reactions:<\/strong> Acids or bases can destabilize chemical bonds, which can lead to material degradation.<\/li>\n
      • Physical Changes:<\/strong> Physical properties such as tensile strength and elasticity can be negatively affected.<\/li>\n<\/ul>\n

        These interdependent effects must be considered to guarantee the lifespan of rubber products.<\/p>\n

        Case Study: CIP\/SIP in the Dairy Industry<\/h2>\n

        In the dairy industry, the contact of elastomeric materials with cleaning and sterilization agents is routine. The “Cleaning in Place” (CIP) and “Sterilizing in Place” (SIP) methods require materials that can withstand aggressive chemicals. In this industry, alkaline cleaners and oxidizing disinfectants are frequently used.<\/p>\n

        Observations<\/h3>\n
          \n
        • Swelling and Hardness Change:<\/strong> Standard rubber types show significant changes in swelling and hardness, which can lead to leaks.<\/li>\n
        • Mass Increase:<\/strong> In aggressive media, a mass increase of over 10% can occur.<\/li>\n
        • Chemical Resistance:<\/strong> Materials such as EPDM and FKM show improved resistance, but specific load limits must also be observed here.<\/li>\n<\/ul>\n

          Recommendations<\/h3>\n

          For applications in the dairy industry, materials should be used that exhibit high chemical resistance and at the same time offer low swelling values. Performing the ASTM D471 test is essential to ensure the suitability of specific materials.<\/p>\n

          Conclusion and Best Practices<\/h2>\n

          Testing according to ASTM D471 is indispensable for evaluating the chemical resistance of elastomers. The importance of this standard arises not only from the need to prevent material failure but also from improving product safety and the longevity of components.<\/p>\n

          Best Practices:<\/h3>\n
            \n
          1. Regular Material Testing:<\/strong> Before using new rubber compounds, tests according to ASTM D471 should always be carried out.<\/li>\n
          2. Compound Optimization:<\/strong> By targeted selection of fillers and plasticizers, resistance to chemical media can be improved.<\/li>\n
          3. Application-Specific Material Selection:<\/strong> For critical applications, special elastomers such as FKM or EPDM should be used.<\/li>\n
          4. Documentation and Monitoring:<\/strong> Changes in material properties should be continuously monitored and documented to detect supply failures early.<\/li>\n<\/ol>\n

            In summary, chemical resistance should be a top priority in the selection of elastomers to maintain both quality and safety in chemically aggressive environments.<\/p>\n\n\n\n

            FAQ<\/h2>\n\n\n

            Which standard regulates the testing of chemical resistance of elastomers?<\/h3>\n\n\n

            ASTM D471 is the most important standard for testing elastomers in liquids. It defines test conditions, solvent classes, and evaluation parameters such as volume change, mass loss, and hardness.<\/p>\n\n\n

            When is silicone EPDM superior in chemical resistance?<\/h3>\n\n\n

            Silicone VMQ is superior at high temperatures above 150 \u00b0C and in CIP\/SIP lines with hot steam. Silicone also remains more stable with repeated food and pharmaceutical contact under heat. EPDM only reaches 130 \u00b0C for a short time.<\/p>\n\n\n

            When is EPDM the better choice?<\/h3>\n\n\n

            EPDM offers better resistance to aqueous acids and alkalis, is more abrasion-resistant, and more cost-effective. For applications below 130 \u00b0C without aggressive hot cycles, EPDM is often the more economical solution.<\/p>\n\n\n

            What does CIP\/SIP resistance mean for seals?<\/h3>\n\n\n

            CIP (Cleaning in Place) and SIP (Sterilization in Place) are cleaning and sterilization processes using hot alkali, hot acid, and hot steam up to 134 \u00b0C. Silicone VMQ compounds withstand these repeated cycles for years, while EPDM ages significantly faster.<\/p>\n","protected":false},"excerpt":{"rendered":"

            The Relevance of Chemical Resistance of Elastomers: A Detailed Analysis Introduction The chemical resistance of elastomers plays a crucial role in numerous industries, especially in those where rubber and rubber-like materials come into contact with chemical substances. 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