Understanding Neodymium Magnet Grades and Working Temperatures

Neodymium magnets are the strongest commercially available permanent magnets, used in various industries such as electronics, automotive, and renewable energy. However, not all neodymium magnets are the same. They are classified into different grades, each with unique magnetic properties and temperature resistance. Understanding these differences is crucial for selecting the right magnet for your application.

Neodymium Magnet Grades Explained

Neodymium magnets are classified using a grade system that typically consists of a letter and a number. The number represents the magnet’s maximum energy product (measured in Mega-Gauss Oersteds, MGOe), while the letter indicates its temperature resistance. The most common grades range from N35 to N55.

Common Neodymium Magnet Grades

• N35 to N52: These grades indicate the strength of the magnet. Higher numbers mean a stronger magnet.

• N55 and above: These are the most powerful commercially available neodymium magnets, but they tend to have lower thermal stability.

Working Temperatures of Neodymium Magnets

Neodymium magnets lose their magnetism when exposed to high temperatures. To counteract this, manufacturers produce temperature-resistant grades that include specific suffixes:

Temperature Ratings and Suffixes

• Standard Neodymium (No Suffix): Maximum operating temperature: ≤ 80°C (176°F)

• M (Medium Temperature): Maximum operating temperature: 100°C (212°F)

• H (High Temperature): Maximum operating temperature: 120°C (248°F)

• SH (Super High Temperature): Maximum operating temperature: 150°C (302°F)

• UH (Ultra High Temperature): Maximum operating temperature: 180°C (356°F)

• EH (Extra High Temperature): Maximum operating temperature: 200°C (392°F)

• TH (Top High Temperature): Maximum operating temperature: 230°C (446°F)

Choosing the Right Grade for Your Application

Selecting the right grade depends on your application’s needs. Consider the following factors:

• Strength vs. Temperature: If you need maximum strength at room temperature, go for N52 or N55. If your application involves high heat, choose SH, UH, or EH grades.

• Industry Requirements:

  • Electronics: N42 or N48 for consumer devices

  • Motors and Generators: SH or UH grades for high heat resistance

  • Medical Devices: Lower-grade magnets to avoid overheating issues

  • Aerospace and Automotive: EH or TH grades to withstand extreme conditions

Conclusion

Understanding neodymium magnet grades and their working temperatures ensures you select the best magnet for your needs. Whether you require maximum strength or high-temperature resistance, choosing the right grade will optimize performance and longevity. If you need assistance selecting the right magnet, our experts are here to help!