EPDM seals: performance characteristics, application areas and their importance

Choosing a food-grade seal that can withstand high temperatures is a critical decision involving safety and performance. In food processing, pharmaceuticals, and other industries that require strict hygiene standards, seals must not only meet food safety requirements, but also be able to work stably in high temperature environments to ensure the sealing performance of the equipment and the quality of the product. This article will give you a detailed introduction on how to choose the right food-grade and high-temperature seal.

1. Understanding food-grade and high-temperature requirements

Food-grade materials

Food-grade seals must meet specific food safety standards to prevent harmful substances from migrating into food. Different countries and regions have different regulations and standards to define what is a food-grade material. For example, in the United States, food contact materials must comply with the regulations of the U.S. Food and Drug Administration (FDA); in Europe, they must comply with the EU's food contact material regulations.

High temperature resistance

In many industrial applications, especially food processing, equipment may need to operate in high temperature environments. Seals must be able to withstand these high temperatures without losing their sealing properties or decomposing to produce harmful substances. Different materials have different heat resistance limits, and the specific operating temperature needs to be considered when selecting.

2. Common food-grade high-temperature resistant materials

1. Fluororubber (FKM)

Fluororubber is known for its excellent high-temperature resistance and chemical stability, and many grades of fluororubber are also approved for food contact materials. It can withstand temperatures up to 250°C and has good resistance to grease, solvents and many chemicals.

2. Silicone rubber

Silicone rubber is a high-temperature resistant elastomer that can operate in a temperature range of -50°C to 250°C. It has good biocompatibility and chemical inertness, and many silicone rubber compounds meet FDA specifications for food contact applications.

3. Ethylene propylene diene monomer (EPDM)

EPDM rubber has excellent heat and weather resistance and can be used for long periods of time at temperatures up to 150°C. Although its food-grade applications may not be as common as fluororubber and silicone rubber, some grades of EPDM are also approved for food contact.

4. Chloroprene rubber (CR)

Chloroprene rubber has good heat resistance, oil resistance and chemical corrosion resistance. In some food processing applications, especially those involving moderate temperatures and oils, neoprene is a suitable choice.

3. Considerations when selecting seals

1. Material compatibility

Ensure that the selected seal material is compatible with the food and cleaning agents it contacts to avoid material degradation or chemical reactions.

2. Temperature range

Select the appropriate material based on the operating temperature of the equipment. Be sure to confirm the continuous use temperature and short-term tolerance temperature of the material.

3. Pressure and wear

Consider the type and degree of pressure the seal will be subjected to, as well as the possible wear, and select a material with appropriate hardness and wear resistance.

4. Cleaning and disinfection

Food processing equipment needs to be cleaned and disinfected regularly, so the seal material should be resistant to commonly used cleaning and disinfecting agents and easy to clean.

5. Certifications and standards

Ensure that the selected seal material meets relevant food safety standards and regulations, such as FDA 21 CFR Part 177, EU Regulation (EU) No 10/2011, etc.

4. Installation and maintenance considerations

1. Correct installation

Ensure that the seal is installed correctly without distortion or damage to ensure its sealing performance.

2. Regular inspection

Regularly check the condition of the seal, including wear, aging and deformation, and replace damaged seals in time.

3. Cleaning procedures

Follow the correct cleaning procedures and use appropriate cleaning agents and methods to prevent damage to the seal.

5. Conclusion

Selecting food-grade and high-temperature resistant seals is a process that requires comprehensive consideration of multiple factors. By understanding the characteristics and application limitations of different materials, and following relevant food safety standards and regulations, you can ensure that the selected seals are both safe and efficient, thereby ensuring food quality and the smooth progress of the production process.

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