Engineering Excellence: FIW6 Wire in Power Conversion
What is FIW6 Fully Insulated Wire?
Fully Insulated Zero-Defect Enameled Copper Wire Grade 6 (FIW6) represents a monumental leap in magnet wire manufacturing for power conversion device winding. Unlike standard enameled wires (Grade 1 or Grade 2) which require additional interlayer insulation tape or margin tape to meet breakdown voltage standards, FIW6 features a heavily controlled multi-layer polyurethane/polyamide enamel coating. This thick, flawless insulation layer satisfies the strict requirements of IEC 60317-56 and IEC 60851-5, delivering zero-defect insulation capable of withstanding voltage spikes above 15,000V peak.
Eliminating Margin Tape & Maximizing Space
In modern power conversion devices—such as EV On-Board Chargers (OBC), resonant LLC transformers, and microinverters—space is at a premium. Traditional transformer design mandates 3mm safety creepage margins on bobbin sides. By adopting FIW6 Fully Insulated Wire, engineers can wind directly from margin to margin. This completely removes the need for margin tape, increasing the available coil slot fill factor by up to 45%, reducing total transformer footprint, and decreasing copper wire length for significantly lower DC resistance (DCR) and enhanced energy efficiency.
Technical Comparison: FIW6 vs. Standard Winding Wires
Discover how FIW6 Fully Insulated Wire outperforms conventional Triple Insulated Wires (TIW) and standard Grade 2 enameled wires across essential power engineering metrics.
| Parameter / Feature | FIW6 Fully Insulated Wire | TIW (Triple Insulated Wire) | Standard Enameled Wire (G2) |
|---|---|---|---|
| Insulation Construction | Multi-coat seamless Polyurethane enamel (Grade 6) | Extruded solid layers (ETFE/FEP/PFA) | Thin enamel coating (Grade 1 or 2) |
| Dielectric Breakdown Voltage | Extremely High (>10kV - 15kV+) | High (approx. 6kV - 10kV) | Low to Moderate (2kV - 4kV) |
| Thermal Class Rating | Class 180 (H) / Class 155 (F) | Class 130 (B) or Class 155 (F) | Class 155 (F) to Class 220 (C) |
| Winding Space Factor | Superior (Thin overall diameter vs TIW) | Bulky (Thick outer insulation wall) | Optimal (Minimal insulation layer) |
| Direct Solderability | Yes (Self-stripping at 390°C - 420°C) | Requires mechanical stripping or special thermal tool | Yes (Depending on enamel polymer formulation) |
| Margin Tape Requirement | Zero (Direct full-width bobbin winding) | Zero (Direct full-width bobbin winding) | Mandatory (3mm creepage distance required) |
| Cost-Efficiency & Processing Speed | High (Fast automatic high-speed winding) | Moderate (Higher material & extrusion costs) | Moderate (Adds step cost for tape application) |
Deep-Dive Application Scenarios in Power Conversion
EV On-Board Chargers & DC-DC Converters
Electric vehicle (EV) automotive architectures demand lightweight power conversion modules capable of high switching frequencies with Wide Bandgap (WBG) semiconductors like GaN and SiC. FIW6 provides high heat resistance (Class 180) and breakdown insulation under thermal stress and high-frequency voltage fluctuations, preventing partial discharge breakdown in tight powertrain envelopes.
High-Frequency Switch-Mode Power Supplies
From industrial power supplies to consumer fast chargers, high-frequency SMPS transformers must minimize leakage inductance while complying with international safety standards (IEC 62368-1). FIW6 wire enables tight magnetic coupling between primary and secondary windings without physical insulation barriers, dramatically improving power density.
Solar Inverters & Renewable Energy Storage
Solar PV inverters and battery energy storage systems (BESS) operate continuously under demanding high-temperature environments. Auxiliary power transformers wound with FIW6 ensure reliable long-term electrical isolation, zero pinhole risks, and robust environmental resistance against moisture and thermal fatigue.
Medical Equipment Isolation Transformers
Medical power converters must meet ultrastrict IEC 60601-1 standards requiring double or reinforced insulation barriers. FIW6's zero-defect insulation guarantee gives medical device designers absolute peace of mind while scaling down the size of diagnostic imaging and life-support power modules.
Industrial Servo Motors & Robotics
Miniaturized actuators and robotic joint motors require high-density magnetic coils that operate reliably despite continuous mechanical vibration and ambient heat. FIW6 exhibits high mechanical toughness, preventing dielectric insulation breakdown during fast automated winding processes.
High-Frequency Flyback Transformers
For flyback and push-pull converter topologies operating up to 1MHz, reducing inter-winding capacitance is paramount. FIW6 delivers ideal insulation thickness with lower parasitic capacitance compared to wrapped taped wires, ensuring clean power switching and low electromagnetic interference (EMI).
About Tianjin Ruiyuan Electric Material Co., Ltd.
20+ Years of Excellence in Custom Magnet Wire Innovation
Tianjin Ruiyuan Electric Material Co,. Ltd. (Ruiyuan) was established in 2002. In the past 20 years, we have been thinking one question: "How to Best Satisfy Customer Needs?" That continuous drive has propelled us to expand our product lines from fine enameled copper wire to litz wire, USTC, rectangular enameled copper wire, triple insulated wire, FIW series wires, and guitar pickup wires—covering 6 main categories with over 20 specialized types of magnet wire.
Here you will enjoy a One-Stop Purchase Service with cost-effective pricing, where quality is the absolute last thing you need to worry about. We aim to help you reduce manufacturing costs, accelerate product development time, and establish long-term, Win-Win commercial cooperation.
What we have been doing over 20 years is pursuing our core operational philosophy: "Customer Oriented, Innovation Brings More Value." This is not just a slogan—it is part of our DNA. Unlike ordinary magnet wire providers that only offer standard off-the-shelf sizes, we are a true technical solution provider backed by professional chemical, electrical, and mechanical engineering expertise.
Innovation Case Study: Custom Litz Wire Breakthrough
One of our European automotive customers urgently required a high-frequency litz wire for wireless charging systems. The application demanded extraordinary solvent resistance and a strict UL94-V0 flame retardancy rating. Standard insulation materials failed to meet these rigorous requirements, and alternative market solutions carried exorbitant prices.
Our dedicated R&D team analyzed the challenge and proposed an innovative approach: extruding specialized ETFE insulation onto the surface of the litz wire. After a rigorous one-year verification and testing phase, our custom ETFE litz wire successfully solved all mechanical, chemical, and flame performance requirements. The project spanned two years of collaborative refinement and has been in full mass production ever since!
Ruiyuan Performance Highlights
Such engineering success is prevalent in our company. These numbers demonstrate our advantages in technology and customer service:
State-of-the-Art Production Facilities
Frequently Asked Questions (FAQ)
Yes. Samples are available for testing. Standard samples can be free or charged depending on exact specs, with shipping costs covered by the customer.
Sample orders are dispatched within 3–5 working days; bulk production orders are typically completed within 15 working days following order confirmation.
We offer a 2-year warranty period. Any confirmed quality-related issues will be covered by a full one-time replacement of defective products.
Submit inquiry with requirements → Sample making → Sample approval → Quotation → Proforma Invoice (PI) → PI confirmation → Payment arrangement → Production → Shipment.
We support EXW, CPT, FOB, CIF, DDU, and DDP to accommodate your global supply chain demands.
Yes, full customization of wire dimensions, shapes (round/flat), insulation colors, and spools is supported. MOQ is subject to negotiation.
We accept T/T (Telegraphic Transfer), D/P, L/C, and PayPal for flexible transactions.
We partner with premier global couriers including FedEx, DHL, TNT, and UPS, offering customer express freight discounts up to 80%.
We offer a complete portfolio of high-frequency magnet wire products (Litz wire, FIW wire, rectangular flat wire, triple insulated wire, OCC wire). We support small-batch customization, rapid engineering R&D support, and strict quality control.
A mold fee applies only for special customized profiles or spools. The mold fee is fully refundable once order volume reaches agreed threshold benchmarks.
Yes, MOQ is flexible and evaluated based on the specific wire gauge, coating thickness, and material type.
Laser diameter gauges, high-voltage spark testers, elongation testers, spring-back testers, dielectric withstand voltage testers, solderability testers, resistance testers, and micro-defect pinhole counters.
Litz wire, rectangular enameled copper wire, magnet wire, self-bonding wire, TIW (triple-insulated wire), FIW fully insulated wire, OCC pure copper wire, silver wire, and silver-plated wire.
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.
Major markets include Europe and North America (Germany, UK, USA, Canada), alongside South Korea, Japan, India, and Southeast Asia.
Yes, by providing high-quality raw copper material, low defect rates, zero tape requirements (FIW), short lead times, and single-source purchasing convenience.
We strictly protect intellectual property and sign non-disclosure agreements (NDAs) prior to engineering evaluations to ensure complete confidentiality throughout our business cooperation.
Explore Complete Magnet Wire Catalog
2USTC-H 19 Strands/42AWG Natural Silk Covered Copper Litz Wire For Power Conversion Device Winding
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
2USTC-F Stranded Wire 0.05mm x225 Strands Silk Covered Litz Wire
FTIW-F 0.15mm ETFE Insulation Triple Insulated Wire
42 AWG Pickup Wire, Plain Enamel Magnet Wire/Heavy Formvar/Poly-coated
FTIW-F 155℃ 0.1mm*250 ETFE Insulation Litz Wire For Transformer
AIW220 0.2mmx5.0mm Super Thin Enameled Flat Copper Wire For Inductor
2UEW-F 0.15mm 99.9999% 6N OCC Pure Enameled Copper Wire
Ultra-high purity single crystal copper wire for minimal distortion and ultra-low electrical resistance.
UEW-F 0.09mm Hot wind Self-adhesive Self-bonding Enameled Copper Wire For Coils
High precision self-bonding wire for bobbinless coil winding in modern sensors and actuators.
Ready to Optimize Your Power Conversion Devices?
Partner with Tianjin Ruiyuan for customized FIW6 fully insulated wires, advanced litz wires, and custom magnet wire solutions engineered to reduce costs, save space, and maximize efficiency.
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