In industries where performance, safety, and reliability are non-negotiable, magnet testing and quality control are critical to ensuring consistent and compliant magnetic components.<\/p>\n\n\n\n
Quality assurance (QA) goes far beyond checking basic pull strength and is vital for the safety of the manufacturer and end user – no matter what you’re sourcing magnets for, be it for electric motors, sensors, medical devices, or industrial assemblies. QA involves material validation, dimensional precision, magnetic performance, and long-term stability, all of which must align with both functional requirements and regulatory standards.<\/p>\n\n\n\n
In this article, we\u2019ll explore the key principles, methods, and best practices behind magnet testing and quality control, helping engineers and procurement professionals make informed decisions.<\/p>\n\n\n\n
Permanent magnets, especially neodymium (NdFeB)<\/strong> and samarium cobalt (SmCo)<\/strong>, are used in critical applications, such as in EV drivetrains and aerospace actuators. Even the smallest of variation in the composition, orientation, or coating could lead to:<\/p>\n\n\n\n Implementing robust magnet inspection protocols at the manufacturing or incoming QC stage is essential to avoid costly downstream failures.<\/p>\n\n\n\n Here are some of the most important testing categories used to evaluate magnetic components:<\/p>\n\n\n\n Testing the core magnetic characteristics<\/strong> of the magnet ensures it meets design performance.<\/p>\n\n\n\n Best Practice:<\/em> Use a Hysteresis Graph (BH Tracer) or Fluxmeter to verify magnetic values per batch.<\/p>\n\n\n\n Precision is essential, particularly when magnets are part of tight-tolerance assemblies (e.g., sensors or brushless motors).<\/p>\n\n\n\n Pro Tip:<\/em> Even small dimensional shifts can impact magnetic circuit behaviour and fit.<\/p>\n\n\n\n Most neodymium magnets are typically coated with nickel or epoxy to protect against corrosion and oxidation.<\/p>\n\n\n\n Magnets degrade over time, especially under elevated temperatures.<\/p>\n\n\n\n Incorrect polarisation or magnetisation angles could result in part rejection or malfunction.<\/p>\n\n\n\n High-reliability industries require both in-process controls (at magnet manufacturing stage) and final acceptance testing at the point of assembly or integration. Best-in-class suppliers will provide:<\/p>\n\n\n\n When evaluating magnet suppliers or auditing quality processes, consider the following:<\/p>\n\n\n\n Partnering with a supplier who understands the application-critical nature of magnets can reduce risk, lower failure rates, and ensure long-term product integrity.<\/p>\n\n\n\n Magnet testing and quality control are not one-size-fits-all. That’s why our expert team is here to support engineers, manufacturers, and designers with:<\/p>\n\n\n\n\n
\n\n\n\nKey Quality Control Checks for Magnets<\/h3>\n\n\n\n
\n\n\n\n1. Magnetic Property Testing<\/strong><\/h4>\n\n\n\n
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\n\n\n\n2. Dimensional & Tolerance Testing<\/strong><\/h4>\n\n\n\n
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\n\n\n\n3. Coating Integrity & Corrosion Resistance<\/strong><\/h4>\n\n\n\n
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\n\n\n\n4. Temperature Stability & Aging Tests<\/strong><\/h4>\n\n\n\n
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\n\n\n\n5. Polarity and Magnetisation Direction<\/strong><\/h4>\n\n\n\n
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\n\n\n\nIn-Process vs Final Quality Inspection<\/h3>\n\n\n\n
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\n\n\n\nWhat to Ask Your Magnet Supplier<\/h3>\n\n\n\n
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