Choosing a food-grade seal that can withstand high temperatures is a critical decision regarding safety and performance. In food processing, pharmaceutical and other industries that require strict hygiene standards, seals not only need to meet the requirements of food safety, but also be able to work stably in high temperature environments to ensure the sealing performance of equipment and product quality. This article will give you details on how to choose the right food grade high temperature sealing ring.
1. Understand food grade and high temperature requirements
Food grade material
Food grade seals must meet specific food safety standards to prevent the migration of hazardous substances into food. In different countries and regions, there are different regulations and standards that define what constitutes a food-grade material. For example, in the United States, food contact materials are required to comply with U.S. Food and Drug Administration (FDA) regulations; In Europe, compliance with the EU Food Contact Material Regulation is required.
High temperature resistance
In many industrial applications, especially food processing, equipment may need to operate at high temperatures. The seal ring must be able to withstand these high temperatures without losing its sealing performance or breaking down to produce harmful substances. Different materials have different heat resistance limits, and the specific use temperature needs to be considered when selecting.
2. Common food grade high temperature resistant materials
1. Fluorine rubber (FKM)
Fluororubbers are known for their excellent high temperature resistance and chemical stability, while many grades of fluororubbers are also approved as food contact materials. It withstands temperatures up to 250°C and is very resistant to oils, solvents and many chemicals.
2. Silicone rubber
Silicone rubber is a high temperature resistant elastomer, capable of operating in the temperature range of -50°C to 250°C. It has good biocompatibility and chemical inertivity, and many silicone rubber compounds meet FDA specifications for food contact applications.
3. Ethylene propylene Diene rubber (EPDM)
EPDM rubber has excellent heat and weather resistance and can be used for a long time at temperatures up to 150°C. While 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)
Neoprene rubber has good heat resistance, oil resistance and chemical resistance. In certain food processing applications, especially those involving moderate temperatures and oils, neoprene is a suitable choice.
3. Considerations when selecting sealing rings
1. Material compatibility
Ensure that the selected seal material is compatible with the food and detergent it comes into contact with to avoid material degradation or chemical reactions.
2. Temperature range
Select the appropriate material according to the operating temperature of the equipment. Be sure to check the material's continuous service temperature and short-term tolerance temperature.
3. Stress and wear
Consider the type and degree of pressure the seal will be subjected to, as well as possible wear conditions, choose a material with appropriate hardness and wear resistance.
4. Clean and disinfect
Food processing equipment requires regular cleaning and disinfection, so the seal material should be resistant to commonly used cleaners and disinfectants, and easy to clean.
5. Certification and standards
Ensure that the selected seal material complies with relevant food safety standards and regulations, such as FDA 21 CFR Part 177, EU Regulation (EU) No 10/2011, etc.
4. Precautions for installation and maintenance
1. Install it correctly
Ensure that the seal ring is properly installed without distortion or damage to ensure its sealing performance.
2. Get regular checkups
Check the condition of the seal regularly, including wear, aging and deformation, and replace the damaged seal in time.
3. Cleaning procedures
Follow proper cleaning procedures and use appropriate cleaners and methods to prevent seal damage.
5. Conclusion
The selection of food-grade seals that can withstand high temperatures is a process that requires a combination of factors. By understanding the characteristics and application limitations of different materials, as well as following the relevant food safety standards and regulations, it is possible to ensure that the seals selected are both safe and efficient, thus guaranteeing food quality and the smooth running of the production process.