Ultra-High Purity Conductor Engineering

Occ Copper Manufacturers & Supplier in Japan

Pioneering 6N/7N Ohno Continuous Casting Single Crystal Copper Wires, Customized Litz Wires, and High-Performance Magnet Wires for Next-Generation Electronics.

Featured Ultra-Purity OCC & Specialty Magnet Wires

Explore our precision-engineered single crystal copper and high-frequency magnet wires, designed to meet the rigorous demands of Japanese electronics, audio hardware, and industrial power systems.

6N OCC High Purity 0.028mm Self adhesive Enameled Copper Wire
6N OCC High Purity 0.028mm Self adhesive Enameled Copper Wire
Custom color nylon served copper litz wire 30*0.07mm
Custom color nylon served copper litz wire 30*0.07mm
Class 200 FEP Wire 0.25mm Copper Conductor High Temperature Insulated Wire
Class 200 FEP Wire 0.25mm Copper Conductor High Temperature Insulated Wire
Class 220 0.35mmx37 Self adhesive Copper Litz Wire For Winding
Class 220 0.35mmx37 Self adhesive Copper Litz Wire For Winding

The OCC Copper Landscape in Japan: Technology, Innovation & Market Growth

Ohno Continuous Casting (OCC) technology, originally pioneered in Japan by Dr. Atsumi Ohno at the Chiba Institute of Technology, revolutionized the metallurgical landscape of ultra-high purity conductors. Today, Japan remains one of the world's most exacting markets for specialized single-crystal copper applications. As top Japanese technology manufacturers expand boundaries in high-end audio hardware, electric vehicle (EV) power electronics, precision robotics, medical ultrasound transducers, and high-frequency wireless charging, the demand for 6N (99.9999%) and higher purity OCC copper wires has reached unprecedented levels.

Unlike standard Oxygen-Free High Conductivity (OFHC) copper, which possesses thousands of microscopic grain boundaries per meter, OCC single crystal copper features a continuous unidirectional crystal structure with virtually no transverse grain boundaries. This unique physical property drastically reduces signal reflection, skin-effect losses, micro-distortion, and electrical resistance at ultra-high frequencies.

Tianjin Ruiyuan Electric Material Co., Ltd. serves as a trusted partner and leading OCC copper supplier to Japanese industrial manufacturers, research institutes, and tier-1 OEM suppliers. By combining state-of-the-art continuous casting extrusion with specialized insulation coating technologies—such as self-bonding enamel, ETFE extrusion, Kapton taping, and ultra-fine Litz stranding—we fulfill Japan's strict quality standards with unmatched precision.

OCC Copper Manufacturing Facilities Serving Japan Market

About Tianjin Ruiyuan Electric Material Co., Ltd.

Dedicated to Customer Satisfaction & Technological Innovation Since 2002

Tianjin Ruiyuan Electric Material Co,. Ltd. (Ruiyuan) was established in 2002. In the past 20 years, we have been thinking one question: "How to Satisfy Customers?" That continuous drive has led us to expand our product lines from fine enameled copper wire to high-purity OCC single crystal wire, custom Litz wire, USTC, rectangular enameled copper wire, triple insulated wire (TIW), and vintage guitar pickup wire—covering 6 main categories with over 20 specialized types of magnet wire.

Here you will enjoy a complete One-Stop Purchase Service with cost-effective factory prices, where quality is the absolute last thing you need to worry about. We aim to help you reduce engineering procurement costs, shorten product development cycles, save precious lead time, and establish long-term Win-Win strategic cooperation.

What we have been doing over 20 years is pursuing our core operation philosophy: "Customer Oriented, Innovation Brings More Value." This is not just a slogan; it is embedded deep inside our corporate DNA. Unlike ordinary magnet wire providers that only offer fixed size ranges, Ruiyuan operates as a comprehensive technical solution provider. We work hand-in-hand with engineering teams across Japan, North America, and Europe to design tailored conductor and insulation configurations suited for high-voltage, high-temperature, and ultra-high-frequency environments.

Ruiyuan Electric Material Headquarters and High Purity Magnet Wire Production

Advanced High-Frequency & OCC Wire Solutions

Precision-engineered solutions utilizing high-purity copper cores, specialized insulation wraps, and thermo-bonding formulations tailored for advanced coil winding.

Taped Litz Wire 0.06mmx385 Class 180 PI Taped Copper Stranded Litz Wire
Taped Litz Wire 0.06mmx385 Class 180 PI Taped Copper Stranded Litz Wire
2USTC-F 0.1mmx300 Nylon Serving Litz Wire for Transformer Copper Litz Wire
2USTC-F 0.1mmx300 Nylon Serving Litz Wire for Transformer Copper Litz Wire
99.99998% 6N OCC 40 AWG 0.08mm High Purity Bare Copper Wire
99.99998% 6N OCC 40 AWG 0.08mm High Purity Bare Copper Wire
Flat litz wire 7.4mmx7.4mm Kapton 0.071mmx6500 Taped Litz Wire For High Frequency high Voltage applications
Flat litz wire 7.4mmx7.4mm Kapton 0.071mmx6500 Taped Litz Wire For High Frequency high Voltage applications

Engineering Case Study: Solving Complex High-Frequency Challenges

Here we want to share one story shortly showcasing our technical customization capability:

One of our European automotive customers needed a high-frequency Litz wire for wireless charging systems in electric vehicles (EV). The project required exceptional resistance to aggressive chemical solvents while adhering strictly to the UL94-V0 flame-retardant rating. Standard insulating materials could not meet these combined requirements, and existing market solutions were prohibitively expensive.

After extensive technical discussions, Ruiyuan's R&D engineering team proposed an innovative custom solution: extruding thin-wall ETFE insulation directly over the high-strand Litz wire surface. After rigorous physical, electrical, and thermal validation over a full one-year testing cycle, all technical roadblocks were completely solved. The project completed two years of validation and has now entered full mass production.

SUCH CASES ARE PREVALENT IN OUR COMPANY, FULLY DEMONSTRATING OUR ADVANTAGES IN TECHNOLOGY AND TAILORED SERVICE.

Ruiyuan by the Numbers

Our manufacturing precision, export capacity, and client satisfaction rates speak for themselves.

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7-10 Days Average Delivery Time
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90% European, North American & Japanese Customers (PTR, ELSIT, STS, etc.)
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95% Repurchase Rate Across Global Clients
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99.3% Satisfaction Rate (Class A Supplier Verified by German & Japanese OEMs)

Localized Application Scenarios for OCC Copper in Japan

Japan’s high-tech manufacturing sector commands rigorous quality standards. Ruiyuan’s 6N/7N OCC single crystal copper and custom wire solutions cater directly to these key industrial sectors:

High-End Audiophile & Studio Gear

Japanese audio manufacturers (Akihabara specialized brands, professional studio hardware, headphone cable makers) utilize ultra-pure 6N OCC copper (bare or enameled down to 0.028mm) for interconnects, headphone cables, and audio transformer windings to eliminate crystal boundary distortion and achieve supreme acoustic clarity.

EV Wireless Power Transfer (WPT)

As Japanese automakers accelerate next-gen EV charging systems, high-strand count taped Litz wires and ETFE/Kapton-insulated flat conductors are vital to reduce skin and proximity effects in 85kHz-class high-frequency inductive charging pads.

Precision Robotics & Servo Motors

Japan leads world industrial automation. High-temperature Class 220 flat rectangular copper wire and self-bonding magnet wires allow ultra-dense slot filling in micro-servo motors, maximizing torque density and thermal endurance.

World-Class Manufacturing & Inspection Infrastructure

Equipped with online laser micrometer diameter monitoring, high-voltage spark testing, elongation analysis, thermal spring-back testers, solderability rigs, and precise resistance bridges.

Ruiyuan Factory Facility 1
Ruiyuan Factory Facility 2
Ruiyuan Factory Facility 3
Ruiyuan Factory Facility 4
Ruiyuan Factory Facility 5
Ruiyuan Factory Facility 6
Ruiyuan Factory Facility 7
Ruiyuan Factory Facility 8

Frequently Asked Questions (FAQ)

Everything you need to know about ordering OCC copper, Litz wire, lead times, warranties, and customization capabilities from Ruiyuan.

1. Can I get samples for testing before placing a batch order?
Yes. Samples are either free or charged, but the shipping cost is borne by the customer.
2. What is your delivery lead time?
Sample orders: 3–5 working days; bulk orders: completed within 15 working days after order confirmation.
3. What is your warranty policy?
Within 2 years, any quality-related issues will be covered by a one-time full replacement of defective products.
4. What is the procurement process?
Submit inquiry with requirements → Sample making → Sample approval → Quotation → Proforma Invoice (PI) → PI confirmation → Payment arrangement → Production → Shipment.
5. What are your trade terms?
EXW, CPT, FOB, CIF, DDU, DDP are all acceptable.
6. Can I customize products with my own logo, size, and shape?
Yes, but the MOQ (Minimum Order Quantity) is subject to negotiation.
7. What are your payment methods?
T/T, D/P, L/C, PayPal.
8. Which courier services do you use?
FedEx, DHL, TNT, UPS, with discounts up to 80%.
9. How are your products different from competitors'? What are your advantages?
We offer a full range of high-frequency magnet wire products, including litz wire, rectangular enameled copper wire, round enameled copper wire, triple-insulated wire, etc., to meet various requirements. We support small-batch customization, ensuring quality and delivery even during your R&D or startup phase.
10. Do you charge a mold fee? How much? Is it refundable? How?
A mold fee applies for special customized products, and the amount depends on the specific specifications. The mold fee is refundable after a certain order quantity is reached.
11. Do you have a Minimum Order Quantity (MOQ)?
Yes, the MOQ is determined based on the wire specification and type.
12. What testing equipment do you have?
Laser diameter gauge, high-voltage spark tester, elongation tester, spring-back tester, withstand voltage tester, solderability tester, Resistance Tester etc.
13. What are your specific product categories?
Litz wire, rectangular enameled copper wire, magnet wire, self-bonding wire, TIW (triple-insulated wire), OCC wire, silver wire, silver-plated wire.
14. Which customers or markets are your products suitable for?
Our products are ideal for applications requiring high efficiency and space-saving solutions in high-frequency AC environments, including power electronics & power supplies, EV on-board chargers, wireless charging systems, green energy, communications & IT, medical equipment, industrial robots, servo motors, etc.
15. Which countries or regions have you exported to?
Major markets include Europe and the US, as well as South Korea, Japan, India, and Southeast Asia.
16. Are your products cost-effective? In what ways?
We offer a full range of products with high quality, short lead times, and support for customization and mixed batches, meeting your one-stop purchasing needs.
17. How do you keep customer information confidential?
We can sign a non-disclosure agreement (NDA) upon request and commit to strictly abiding by its terms throughout the entire cooperation process.
One-Stop Solution Enameled Copper Wire

One-Stop Solution for Custom Magnet Wire

100% Open and Delivering On-Time

As a leading global supplier of high-purity OCC wire and enameled magnet wire, we have earned a stellar reputation for providing a superior customer experience, first-class technical guidance, and seamless international order fulfillment.

Explore Full Product Catalog

Exquisite, Quality, All For The Customer!

Ruiyuan attracts top technical and management talents. Our visionary leadership team has built one of the best engineering capabilities in the magnet wire industry. This acts as our rock-solid guarantee to supply world-class single crystal copper and specialized Litz wires to Japanese and global high-tech manufacturers.

Explore Key Features
High Quality Magnet Wire Production

Comprehensive Wire Product Catalog

Discover our full product range engineered for power electronics, transformers, pickups, and high-frequency systems.

2USTC-H 19 Strands/42AWG Natural Silk Covered Copper Litz Wire For Audio Cable
2USTC-H 19 Strands/42AWG Natural Silk Covered Copper Litz Wire For Audio Cable
PI Taped Copper Litz Wires 0.32mm 156 Strands 6000V Insulated Stranded Wire For EV Vehicle
PI Taped Copper Litz Wires 0.32mm 156 Strands 6000V Insulated Stranded Wire For EV Vehicle
3500V 12.1mm*3.4mm Flat Wire 2UEW-F-PET(N) 0.28mmx300 Rectangular Mylar Litz Wire For Transformer
3500V 12.1mm*3.4mm Flat Wire 2UEW-F-PET(N) 0.28mmx300 Rectangular Mylar Litz Wire For Transformer
2USTC-F Stranded Wire 0.05mm x225 Strands Silk Covered Litz Wire
2USTC-F Stranded Wire 0.05mm x225 Strands Silk Covered Litz Wire
FTIW-F 0.15mm ETFE Insulation Triple Insulated Wire
FTIW-F 0.15mm ETFE Insulation Triple Insulated Wire
42 AWG Pickup Wire, Plain Enamel Magnet Wire/Heavy Formvar/Poly-coated
42 AWG Pickup Wire, Plain Enamel Magnet Wire/Heavy Formvar/Poly-coated
FTIW-F 155℃ 0.1mm*250 ETFE Insulation Litz Wire For Transformer
FTIW-F 155℃ 0.1mm*250 ETFE Insulation Litz Wire For Transformer
AIW220 0.2mmx5.0mm Super Thin Enameled Flat Copper Wire For Inductor
AIW220 0.2mmx5.0mm Super Thin Enameled Flat Copper Wire For Inductor
2UEW-F 0.15mm 99.9999% 6N OCC Pure Enameled Copper Wire
2UEW-F 0.15mm 99.9999% 6N OCC Pure Enameled Copper Wire
High Purity 99.9999% 6N Copper Pellets For Evaporation
High Purity 99.9999% 6N Copper Pellets For Evaporation
UEW-F 0.09mm Hot wind Self-adhesive Self-bonding Enameled Copper Wire For Coils
UEW-F 0.09mm Hot wind Self-adhesive Self-bonding Enameled Copper Wire For Coils
2UEW-F-2PI 44AWG/0.05 225 High Frequancy Taped Copper Litz Wire
2UEW-F-2PI 44AWG/0.05 225 High Frequancy Taped Copper Litz Wire

Explore What RUIYUAN Can Do For You

We sincerely welcome business partners and engineers from Japan, Asia, Europe, and the Americas. Contact us today to receive customized technical support, free samples, and competitive quotes for OCC copper and high-frequency magnet wires.

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