Why Mainrich
Quality Guaranteed
- • IATF 16949 & ISO certified network
- • 100% inspection before shipping
- • Full traceability on every order
- • Consistent specs, batch to batch
Factory Direct
- • Equity stake in the Zhongshan plant
- • No middleman markup
- • Custom grades and shapes
- • Prototype to mass production
Reliable Partner
- • Response within 1 business day
- • Clear, honest communication
- • On-time delivery track record
- • Technical support included
What We Supply
Neodymium (NdFeB)
N30 to N58 grades. Sintered and bonded. Custom shapes and coatings.
Samarium Cobalt (SmCo)
High-temp applications. Corrosion resistant. Stable where NdFeB derates.
Ferrite
Cost-effective. Isotropic and anisotropic. High volume production.
Magnetic Assemblies
Motor magnets. Sensor assemblies. Custom designs to your spec.
Where We Are
Zhongshan
Headquarters & Manufacturing
London
European Office
Macao
Operations
Zhongshan
NdFeB & Assemblies Factory
Dongguan
Ferrite & Bonded Magnets
Ningbo
SmCo & High-Temp Grades
Our Journey
30+ years of building the supply chain infrastructure that automotive, robotics, and electronics OEMs depend on.
Founded in Hong Kong
Connie Cheang establishes Mainrich International as a trading company, sourcing permanent magnets for electronics manufacturers across Asia.
First Production Site
Enters exclusive partnership with NdFeB sintering facility in Zhongshan, Guangdong. Begins offering custom grades and shapes direct from production.
First Automotive OEM Contract
Wins first direct supply contract with a Japanese automotive Tier-1 for DC motor arc magnets. Annual volume: 500,000 pieces. Triggers investment in 100% inspection capability.
ISO 9001 & First Plant Stake
The Zhongshan plant achieves ISO 9001 certification. Mainrich acquires an equity stake in the plant, the first position in what becomes today's four-site production network.
IATF 16949 Certification
The production network passes its IATF 16949 automotive quality audit on first attempt. Opens doors to European and American automotive OEMs. Client base grows to 50+ active accounts across 30 countries.
London Office Opens
Establishes European sales office in London to provide local-timezone support for growing UK and EU customer base. The production network grows with the Dongguan and Ningbo plants.
Radial Multipole Launch
Invests in purpose-built radial multipole magnetization equipment. Begins supplying sintered NdFeB radial rings for humanoid robotics and high-speed BLDC motors.
GBD Technology & Export Compliance
Adopts Grain Boundary Diffusion (GBD) technology — in the factory-verified case, 75% less dysprosium at equal coercivity with no Br loss. Builds dedicated export compliance team after China's April 2025 rare earth controls take effect. Develops new low-HREE magnet formulations that comply with updated regulations while maintaining performance specs. Runs MOFCOM licensing in parallel with production so shipments never wait.
Inside the Production Network
Four plants across China in which Mainrich holds equity stakes, each specializing in different magnet technologies and production processes.
Zhongshan — NdFeB & Assemblies
The network's primary plant for sintered neodymium magnets and custom magnetic assemblies. Houses the full production chain from powder processing to finished parts.
Capabilities
- • Sintering & pressing
- • CNC grinding (±0.02mm)
- • Multi-pole magnetization
- • NiCuNi / Epoxy coating
Equipment
- • 12 CNC surface grinders
- • 4 wire-cut EDM machines
- • Programmable magnetizer
- • CMM inspection station
Dongguan — Ferrite & Bonded Magnets
High-volume production of ferrite and bonded NdFeB magnets. Optimized for cost-effective mass production with automated pressing lines.
Capabilities
- • Wet & dry pressing
- • Injection molding
- • Isotropic & anisotropic
- • Multi-cavity tooling
Capacity
- • 200 tons/month ferrite
- • 50 tons/month bonded
- • 8 pressing lines
- • 24/7 operation
Ningbo — SmCo & High-Temperature Grades
Specializes in Samarium Cobalt and high-temperature NdFeB grades for energy and high-temperature industrial uses where thermal stability is critical.
Capabilities
- • SmCo sintering
- • High-temp NdFeB (200°C+)
- • Salt spray testing
- • BH curve measurement
Certifications
- • ISO 9001:2015
- • IEC 60068 testing
- • Full lot traceability
Quality Control & Logistics
Centralized QC across all facilities with standardized inspection protocols. Every batch is tested before shipping — dimensional, magnetic, coating adhesion, and visual.
QC Equipment
- • Helmholtz coil systems
- • Gaussmeters (DC & AC)
- • Coordinate Measuring Machine
- • X-ray fluorescence analyzer
Standards
- • IATF 16949 automotive
- • PPAP documentation
- • 100% incoming inspection
- • CPK tracking per lot
4
Manufacturing Sites
35+
CNC Machines
300+
Production Staff
500t
Annual Capacity
Let's Talk
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