Shipping neodymium magnets via air requires special considerations due to their strong magnetic fields. As a neodymium magnet manufacturer, we understand that these magnets, being some of the most powerful permanent magnets, are subject to strict regulations to ensure safe and compliant transportation. Here is a comprehensive guide to shipping neodymium magnets by air:

Classification of Neodymium Magnets and The Strength

Neodymium magnets are considered hazardous materials by both the International Air Transport Association (IATA) and the Department of Transportation (DOT) if they exceed certain magnetic field thresholds.

Small Magnets: Smaller neodymium magnets, such as those used in consumer products, may not be subject to dangerous goods regulations, but it is crucial to check their field strength.

High strength neodymium magnets: Neodymium magnets with a magnetic field strength that exceeds 0.005 Gauss at a distance of 2.1 meters from the package must be treated as Class 9 (Miscellaneous Dangerous Goods) for air transport under IATA and DOT regulations.

Accurately measuring magnetic field strength

Accurately measuring magnetic field strength is crucial to ensure your magnetic products meet air shipment requirements. To ensure compliance, we suggest using a gaussmeter and adhering to the following procedure:

Select a gaussmeter with a resolution of 0.1 mG or higher for accurate readings. Move the probe around the package to identify the point of maximum magnetic field strength. Measurements should be taken at a distance of 7 feet (approximately 2.1 meters) from the container's walls. If the magnetic field strength exceeds the permitted limit, additional shielding or other mitigation methods will be necessary to meet air transport standards.


By following this measurement process, you can verify that the magnetic product's field strength is within the allowed limits, preventing potential shipment issues caused by exceeding the limits.

Packaging Requirements

Proper packaging is essential for safely shipping neodymium magnets. Here are the key considerations:

Shielding the Magnetic Field: The package must be designed to shield the magnetic field to prevent interference with aircraft systems and nearby devices. Special magnetic shielding materials may be required, like iron or steel, to create a magnetic shield.

Stabilizing the Magnet: Magnets should be secured inside the packaging to prevent movement, which could cause magnetization or damage to the magnet itself.

Padding and Protection: The packaging should include padding to protect the magnet from physical shock and avoid any movement inside the box.

Shipping Restrictions and Airline Requirements

Airline Restrictions: Different airlines may impose varying restrictions for shipping neodymium magnets. It’s important to confirm with the airline or freight forwarder about their specific requirements.

Packaging Compliance: Ensure the packaging complies with the airline’s regulations regarding the maximum permissible magnetic field strength, and that all necessary labels and documentation are in place.

Safety Considerations

Electronic Equipment: Ensure that magnets are kept away from sensitive electronics, including devices like mobile phones, laptops, medical equipment, and navigation systems, both during packaging and transport.

Training: Staff handling the magnets must be trained in the proper handling of hazardous materials to ensure compliance with shipping regulations.

By following these guidelines and ensuring compliance with the necessary regulations, you can safely and efficiently ship neodymium magnets by air. Shipping magnets by air presents its own set of challenges, Zoyn, with over 25 years of experience in custom neodymium magnets, can assist in selecting the right packaging materials to ensure both safety and compliance during air transport. Our general approach is to transport all magnetized products via ground services. However, when air transport is required, we can prepare the magnets with adequate shielding to ensure safe and compliant shipping.

Bonded neodymium arc magnets, is one of the main products sold by Zhejiang Zoyn Magnetics Co., Ltd. It has become a popular choice in various design applications due to its unique performance advantages. These magnets, crafted from a combination of neodymium, iron, and boron (NdFeB) powders mixed with a binding agent, offer distinct benefits that enhance the functionality and efficiency of numerous products.

Precision in Magnetic Field Distribution

In applications like magnetic sensors used in automotive ABS (Anti - lock Braking Systems), precision in magnetic field distribution is crucial. Bonded neodymium arc magnets can be designed with great accuracy to produce a specific magnetic field pattern. Their arc shape allows for a more targeted and concentrated magnetic field in a particular direction. For example, in a sensor that detects the rotation of a wheel, the arc magnet can be shaped in such a way that it provides a consistent and reliable magnetic signal as the wheel turns. This precision ensures that the sensor can accurately measure the wheel's speed, enabling the ABS system to function effectively and prevent wheel lock - up during braking.

Design Flexibility

One of the most significant advantages of arc bonded neodymium magnet is their design flexibility. They can be molded into complex shapes, which is highly beneficial in compact electronic devices. Consider the design of a wireless earbud. The limited space inside the earbud requires magnets that can fit snugly while still providing the necessary magnetic force for functions like speaker operation and charging. Bonded neodymium arc magnets can be customized to fit the unique curved shape of the earbud housing. This not only optimizes the use of space but also ensures that the magnetic components work efficiently within the small form factor. In addition, the bonding process allows for the integration of magnets with other materials, such as plastics or metals, which can further enhance the overall design of the product.

Cost - Effectiveness in Mass Production

For industries involved in mass - producing consumer goods, cost - effectiveness is a major consideration. N52 neodymium half round arc magnets are relatively inexpensive to manufacture compared to some other types of magnets. The use of a binding agent in the production process reduces the amount of raw neodymium material required. For instance, in the production of small toys that incorporate magnetic components for interactive play, the cost savings from using bonded neodymium arc magnets can be substantial. Manufacturers can produce large quantities of these toys without incurring high material costs. Moreover, the ease of molding these magnets into the required shapes simplifies the manufacturing process, further reducing production time and costs.

Resistance to Demagnetization

In applications where magnets are exposed to varying environmental conditions, resistance to demagnetization is vital. Bonded neodymium arc magnets exhibit good resistance to demagnetization. Take the example of magnetic closures used in outdoor clothing. These closures need to maintain their magnetic strength even when exposed to moisture, temperature changes, and mechanical stress. Bonded neodymium arc magnets can withstand these harsh conditions and continue to function effectively. Their resistance to demagnetization ensures that the clothing closures remain secure, providing a reliable and long - lasting solution for outdoor enthusiasts.

Bonded neodymium arc magnets offer a range of key advantages in design, from precision in magnetic field distribution and design flexibility to cost - effectiveness in mass production and resistance to demagnetization. These qualities make them an ideal choice for a wide variety of applications, spanning from automotive and electronics to consumer goods and outdoor gear.

If you have more application requirements or questions about magnets products, please contact our professional team.

In the world of magnetism, neodymium magnets have emerged as a game - changing force. Their unique properties have made them a popular choice across a wide range of industries. But what exactly makes neodymium magnets stand out from other magnetic materials?

Exceptional Magnetic Strength

Neodymium magnets are renowned for their incredibly high remanence. Remanence refers to the magnetic field remaining in a magnet after the external magnetic field used to magnetize it is removed. N52 grade neodymium magnets, one of the strongest grades available, can have remanence values as high as 1.4 teslas. To put this into perspective, ferrite magnets, a common alternative, typically have remanence in the range of 0.2 - 0.4 teslas. This high remanence allows neodymium magnets to generate a much stronger magnetic pull, making them ideal for applications where a powerful magnetic force is required, such as in electric motors used in hybrid cars or in high - performance speakers.

Another aspect of their strength is high coercivity. Coercivity is the measure of a magnet's ability to resist demagnetization. Neodymium magnets have a very high coercivity, which means they can maintain their magnetic properties even when exposed to strong external magnetic fields or high temperatures (to a certain extent). In comparison, alnico magnets, which are known for their good temperature stability, have lower coercivity values in some cases. This makes neodymium magnets more reliable in applications where there may be a risk of accidental demagnetization.

Power - to - Size Ratio

One of the most significant advantages of neodymium magnets is their remarkable power - to - size ratio. Due to their high magnetic strength, small neodymium magnets can deliver a substantial magnetic force while being relatively small in size. This is a huge benefit in applications where space is at a premium, such as in portable electronics like smartphones, tablets, and wireless earbuds. In these devices, small neodymium magnets are used in components like vibration motors and speakers, providing the necessary magnetic functionality without taking up too much space.

Ease of Integration

Their lightweight nature also makes them easier to integrate into various products. When compared to larger and heavier magnetic materials, neodymium magnets allow for more flexible design options. For example, in the aerospace industry, where weight reduction is crucial for fuel efficiency, neodymium magnets can be used in actuators and sensors without adding excessive weight to the aircraft.

Diverse Industrial Uses

Neodymium magnets find applications in a vast array of industries. In the medical field, they are used in MRI machines to generate the strong magnetic fields required for imaging. Their precision and strength enable detailed and accurate scans. In the manufacturing industry, circular strong neodymium magnets are used in magnetic separators to remove metal contaminants from materials. In the renewable energy sector, neodymium magnets are a key component in wind turbine generators, helping to convert wind energy into electricity efficiently.

Consumer Product Applications

In consumer products, neodymium magnets are everywhere. They are used in magnetic closures for bags and wallets, providing a convenient and secure way to fasten. In toys, they can create interactive and engaging play experiences. Their versatility stems from their ability to be shaped, sized, and magnetized in different ways to suit specific application requirements.

Neodymium magnets' exceptional magnetic strength, compact size, and versatility set them apart from other magnetic materials, making them an invaluable resource in modern technology and industry.

On March 6, 2025, Zoyn Magnetics and Hangzhou Dianzi University (HDU) held a prestigious signing and inauguration ceremony for their newly established Joint Research Center at Zoyn Magnetics' headquarters. This landmark event was graced by prominent leaders, including Shen Li, Party Secretary of the School of Materials and Environmental Engineering at HDU; Dean Zhang Xuefeng; Vice Dean Zhao Lizhong; Deputy Director of the Municipal Bureau of Economy and Information Technology, Chen Wenyao; Secretary-General of the Provincial Magnetic Industry Association, Tan Huming; along with Zoyn Magnetics’ key executives, Chairman Ren Yuanyue, Zhao Ye and others.

In today’s rapidly evolving global technology landscape, innovation is the driving force behind industrial and economic growth. Strengthening industry-academia collaboration and accelerating the commercialization of scientific advancements have become crucial in shaping a competitive and forward-thinking business environment. As a national-level "Little Giant" enterprise specializing in high-performance NdFeB permanent magnets—Zoyn has always regarded technological innovation as its cornerstone. With annual R&D investment exceeding 5% of revenue and ownership of 87 core patents, the company’s products are widely applied in strategic fields such as new energy vehicles, smart equipment, etc. The collaboration with HDU targets cutting-edge advancements like "ultra-high-temperature-stable permanent magnets" and "nano-scale grain boundary diffusion technology." Over the next three years, the partnership aims to commercialize five core patented technologies, accelerating product iteration by 30%.

A New Paradigm for Industry-Education Integration: Building an Innovation Ecosystem

The Joint R&D Center pioneers a “dual-engine” collaboration model, driving both technological breakthroughs and talent cultivation:

Demand-Driven R&D: A “Technical Challenges Pool” consolidates critical production pain points identified by the enterprise. HDU research teams will employ a mission-oriented approach to systematically tackle these challenges, accelerating innovation.

Tailored Talent Development: The “Distinguished Engineers Program”, jointly designed by both parties, will integrate Zoyn’s technical experts as mentors, fostering a new generation of interdisciplinary talent equipped with real-world problem-solving skills.

End-to-End Innovation Incubation: Supported by dedicated transformation fund, the center implements a three-stage validation system—lab prototype, pilot testing, and mass production—ensuring a smooth and efficient transition from research to commercialization.

This synergy of "academic brilliance and industrial pragmatism" not only propels Zoyn’s high-quality growth but also shaping the future of technological innovation. We remain steadfast in its mission to push the boundaries of magnetic materials technology, ensuring that it remains at the vanguard of global industrial progress.

CACE2025 is set to grandly open from March 17th to 19th, 2025, at Hall 8.2 of the National Exhibition and Convention Center (Shanghai). This exhibition boasts a grand scale, covering an exhibition area of 23,000 square meters, and will gather over 300 leading enterprises in the industry.

The exhibition focuses on the global forefront of the agricultural chemical industry, presenting advanced technological concepts, production equipment, comprehensive solutions, and highly efficient application devices for agricultural chemicals. Its aim is to facilitate international trade exchanges and capacity cooperation, and promote the global agricultural chemical industry towards green, intelligent, and high-quality development.

Anhui Shengshi Datang, which specializes in the research and development and production of chemical equipment, has made meticulous preparations for this exhibition. With its professional strength and innovative products, it has attracted numerous customers to come for inquiries and understanding.

In the agricultural chemical industry, magnetic pumps and centrifugal pumps are widely used. The leak-free characteristic of magnetic pumps makes them an ideal choice for transporting highly corrosive and high-purity pesticide raw materials and formulations, effectively ensuring production safety and product quality. Centrifugal pumps, with their high-flow transportation capacity and good adaptability to different viscosity liquids, perform excellently in large-scale pesticide solution transportation. At the same time, they can promote uniform reactions and control temperatures in circulation systems, thereby enhancing production efficiency and product quality.

At CAC2025, Anhui Shengshi Datang Chemical Equipment Group Co,Ltd. presented many innovative technologies and agrochemical products. With advanced chemical process pump solutions and intelligent agrochemical services, it expanded markets at home and abroad, got more orders, and had strategic cooperations with top agrochemical firms. It consolidated its leading position in the industry with achievements in relevant fields. The exhibition promoted the industry chain upgrade. It will keep innovating to drive the industry's green transformation.

Anhui Shengshi Datang Chemical Equipment Group Co., Ltd. specializes in the integrated R&D, manufacturing, sales, and service of magnetic pump, graphite equipment, and complete  chemical corrosion-resistant devices, delivering comprehensive solutions for industrial applications.

Please read the installation and operating instructions carefully when you are working with our pumps.

1.Before installation and operation, carefully read the Installation, Operation, and Maintenance Manual.

2.Pipeline weight must be independently supported; the pump shall not bear the weight of pipelines or other torsional forces.

3.Lubrication (46# oil):

  Oil level should be maintained between 5 mm above the centerline and the centerline of the oil sight glass.

  Replace lubricating oil every 1,500 hours of operation.

4.For new pipelines and storage tanks:

  Flush thoroughly to remove solid contaminants that could damage the mechanical seal.

  Manually rotate the coupling before startup. If jamming or abnormal friction occurs during installation, resolve the issue before operation.

5.Cooling/flush fluid requirements:

  Use clean, non-scaling liquid. Scaling water may block cooling channels and reduce seal lifespan.

  Condensate is ideal for seal flushing. Ensure temperature <85°C.

6.Startup/shutdown sequence:

  Start cooling/flush fluid before pump operation.

  Stop the pump first before shutting off cooling/flush fluid.

7.Rotation direction:

  Verify pump rotation direction before startup. Avoid reverse rotation.

  Close the discharge valve before shutdown to prevent reverse rotation.

8.Flow control:

  Do not use the suction valve to adjust flow, as this may cause cavitation.

9.Mechanical seal leakage tolerance:

  For shaft diameters >250 mm: Allowable leakage ≤5 mL/h.

  For shaft diameters <50 mm: Allowable leakage ≤3 mL/h.

10.Cooling/flush fluid monitoring:

  Regularly check fluid flow. If interrupted, do not immediately restart.

  Allow the seal to cool before resuming flow to prevent thermal shock.

  Normal temperature rise: ≤20°C.

11.Minimum flow restriction:

  Do not operate the pump below 1/3 of the design flow for extended periods.

  Install a bypass line at the discharge to maintain flow within the required range if necessary.

12.Long-term shutdown:

  Fully clean the pump to remove residual corrosive or crystallizing liquids.

At the 25th China International Agricultural Chemical Equipment and Plant Protection Machinery Exhibition, the atmosphere was extremely enthusiastic. A Jordanian customer, full of interest, walked through the exhibits with our foreign trade manager, learning in detail about our products, including magnetic drive pumps, multistage centrifugal pumps, etc. The customer's eyes revealed great interest.

Crises and Lessons Caused by the Centrifugal Pump

In a large chemical plant, the centrifugal pump is vital for production. Young operator Xiao Li witnessed two incidents.

Once, during pump repair, the maintenance master ignored the use of special lifting bolts and forgot to cut off power. Xiao Li, though uneasy, didn't speak up. The pump fell but luckily no one was hurt, and he quickly shut off the power.

Later, when transporting corrosive chemicals, the team leader, eager to meet the deadline and without consulting materials, thought the pump was suitable. Xiao Li followed but had doubts. Leakage occurred, splashing some operators and causing environmental issues. The company faced fines and scrapped the pump early.

Afterwards, the factory strengthened training, and Xiao Li became more cautious. The scrapped pump reminds all that strict compliance with specifications is crucial for safety.

This incident has also attracted the attention of our Shengshi Datang, and the following notes have been made:

​​1. Use of Damaged Tools​​
Using damaged or defective tools is extremely dangerous. Always use qualified tools.

​​2. Personal Protective Equipment (PPE)​​
When disassembling, assembling, repairing pumps, or handling hazardous/dangerous liquids of unknown properties, ensure the following PPE is worn:

 Safety gloves, helmets, and protective shoes.

 Additionally, wear goggles and face shields when handling wet-end components.

​​3. Prevent Pump Drop Injuries​​

 Ensure the lifting chains/ropes used during pump installation are sufficiently strong to prevent accidents.

 No one should stand under a lifted or suspended pump during hoisting.

​​4. Proper Lifting Points​​
 Use only the designated lifting bolts (or lifting rings) when securing the pump with chains/ropes. Never lift the pump by other parts.

​​5. Power Off During Maintenance​​

 Always disconnect power before repairing the pump.

 Take extra precautions to prevent other operators from accidentally turning on the power switch.

 In noisy or poorly lit environments, place a warning sign near the power switch to indicate ongoing maintenance.

 Incorrectly turning on the power during maintenance can cause serious injuries. All operators must remain vigilant.

​​6. Power-On Safety​​

 Before reconnecting power, ensure no one is near the pump.

 The pump has no ON/OFF switch; it starts automatically when power is connected. Carefully check the surroundings before energizing.

​​7. Operate at Specified Voltage​​
 Run the pump only at the voltage specified on the nameplate. Operating at other voltages may cause fire or electric shock.

​​8. Emergency Power Disconnection​​

 Immediately disconnect the power switch if the pump stops due to power issues or disconnected output lines.

 Resume operation only after restoring normal conditions.

​​9. Prohibited Liquid Transport​​
 Do not use the pump to transport liquids not specified in the design. The company is not liable for injuries or damages caused by misuse.

​​10. Ventilation for Hazardous Liquids​​

 Ensure proper ventilation when handling toxic or odorous liquids.

 Operators must wear protective gear (e.g., safety masks, goggles, gloves).

​​11.Prohibit Discharging Toxic Substances​​
 Do not allow lubricants, solvents, or similar substances to enter local sewage systems or rivers.

​​12. Proper Disposal of Toxic Liquids​​

 Never discharge chemical solutions (e.g., pumped liquids) directly onto the ground.

 Use dedicated containers and comply with laws/regulations on hazardous material handling.

​​13. No Passage Under Suspended Pumps​​
 Never walk under a lifted pump; sudden drops can cause severe injuries.

​​14. Prohibit Pump Modification​​
 Unauthorized modifications by users may cause serious injuries, electric shocks, or pump damage. Do not attempt modifications.

​​15. Handling Dangerous Fluids​​

 Exercise extra caution when transporting hazardous liquids (e.g., flammable, corrosive, or health-hazardous fluids).

 Conduct daily inspections to prevent leaks, which can lead to explosions, fires, or injuries.

​​16. Qualified Personnel Only​​

 Only trained and experienced operators are allowed to handle pumps.

 Supervisors must prevent unauthorized personnel from operating pumps.

​​17. Designated Operating Conditions​​

 The pump is designed for specific conditions agreed with the client.

 Unauthorized use in other scenarios may cause injuries or damage. Consult the company/supplier before modifying operating conditions.

​​18. Ventilation Requirements​​
 Ensure adequate ventilation when working with toxic liquids to prevent poisoning.

​​19. Prevent Liquid Splashes​​
 Implement measures to prevent splashes from pump or pipeline failures (including transported liquids).

​​20. Prohibit Dry Running​​

 Never run the pump without liquid (dry running). Friction from dry operation generates heat, damaging internal components.

 Operating with the suction valve fully closed is also considered dry running.

​​21. Heat/Fire Prevention​​
 Do not place flammable materials or open flames near the pump.

​​22. No Standing on Pump​​
 Never use the pump as a ladder; it may cause severe injuries.

SEMICON China 2025: Technological Innovation of Chemical Pumps Drives Semiconductor Industry Revolution

- New Trends of High Efficiency, Reliability and Intelligence

As the core event in the global semiconductor industry chain, SEMICON China 2025 has once again become a technology barometer. As the semiconductor manufacturing industry moves towards finer processes (such as chips below 2nm) and green manufacturing, the technological innovation and reliability of chemical pumps, as the "heart equipment" in the process flow, have become the focus of the exhibition.

I. High-Purity Materials and Corrosion Resistance: Meeting the Demands of Extreme Processes

Semiconductor production involves strong acids (such as hydrofluoric acid), strong alkalis (such as potassium hydroxide), and high-purity chemical reagents, posing extremely demanding requirements for the corrosion resistance and purity of pump materials. At this exhibition, multiple companies introduced magnetic drive chemical pumps made of high-purity PTFE, ceramic coatings, or lined with zirconium alloys. These pumps feature leak-free performance, corrosion resistance, and easy maintenance. For example, a German manufacturer showcased a CVD process dedicated pump. Through nano-coating technology, the particle release amount was reduced to less than 0.1μm, meeting the semiconductor manufacturing industry's extremely strict standards for micro-contamination.

II. Energy Efficiency Optimization and Intelligence: The New Engine of Green Manufacturing

In response to the global trend of carbon neutrality, energy efficiency upgrade of chemical pumps has become a key focus. Permanent magnet brushless motor direct drive technology and AI adaptive flow control algorithm have become key terms. A Chinese company released an intelligent pump group management system that can monitor the vibration, temperature, and flow fluctuations of the pump body in real time. Through digital twin technology, it can predict faults and reduce energy consumption by 30%. In addition, variable frequency drive technology combined with dynamic speed adjustment according to process requirements has become crucial for production line cost reduction and efficiency improvement.

III. Modular Design and Domestic Substitution: The Rise of Local Manufacturers

In response to the rapid model change requirements of semiconductor production lines, modular quick-installation pump bodies have become a new trend. Domestic manufacturers such as China Micro Semiconductor Pump Industry exhibited detachable corrosion-resistant pump modules that support cleaning and medium switching within 24 hours, suitable for multiple scenarios such as IC front-end wet etching and photovoltaic PERC cleaning. At the same time, the exhibition set up a "Domestic High-End Pump Technology Zone" for the first time. The domestication rate of domestic pumps in the 14nm process has reached 65%, and in some areas, technological counter-surpassing has been achieved.

IV. Market Opportunities and Competitive Landscape

Data from SEMI shows that the market size of China's semiconductor equipment is expected to exceed $60 billion in 2025, with chemical pumps accounting for about 12%, and an average annual growth rate of 18%. With geopolitical factors driving supply chain localization, local manufacturers continue to make efforts in technology iteration and cost-effectiveness, while foreign brands focus on the iterative upgrading of ultra-pure process pumps.

In the semiconductor field, chemical pumps account for a considerable proportion. Anhui Shengshi Datang Group keenly seized this opportunity and actively participated in the exhibition to expand cooperation areas. Regarding our company's technological research in the semiconductor industry, the following processes are presented. In the front-end process, an ultra-high-purity PFA-lined fluorine magnetic pump is adapted for BOE etching solution transportation, with a temperature resistance range of -50°C to 180°C. In the middle-end process, a self-priming multi-stage centrifugal pump is matched with the exhaust condensate circulation of the EUV lithography machine. In the back-end process, a corrosion-resistant pneumatic diaphragm pump is used for adding electroplating solution to the ABF carrier board. At the same time, we have launched a "pump body lifecycle management" service, equipped with medium matching testing, and providing customized transformation plans to assist in the development of the semiconductor industry.