Class 220 Polyamide-Imide Insulation | Grade 2 Heavy Build | GB
Standard QXY | Optimized for High-Efficiency Coils & EV
Applications
Featured: Grade 2 Heavy Build (Rectangular)
AIW rectangular wires with Grade 2 polyamide-imide insulationprovide superior dielectric strength, excellent thermal endurance
(Class 220), and outstanding chemical resistance. Ideal for formed
coils, dry-type transformers, and EV motor windings. Grade 1 &
Grade 3 available upon request.
Spring back angle:Controlled for coil winding precision
Copper fill factor:Up to 25% higher than round wire
Typical Dimensions (AIW Rectangular - Grade 2 Heavy Build)
a x b (mm)
Tolerance (mm)
Min. film build Gr.2 (mm)
Max. outer dimension (mm)
Typical Breakdown (V)
1.00 x 2.00
±0.03/±0.05
0.045
1.10 x 2.10
≥2800
1.20 x 2.50
±0.03/±0.05
0.050
1.32 x 2.62
≥3300
1.50 x 3.00
±0.04/±0.06
0.050
1.62 x 3.12
≥3500
1.80 x 4.00
±0.04/±0.06
0.055
1.93 x 4.13
≥4000
2.00 x 5.00
±0.04/±0.07
0.055
2.14 x 5.14
≥4500
2.50 x 6.30
±0.05/±0.08
0.060
2.65 x 6.45
≥5000
3.00 x 8.00
±0.06/±0.10
0.065
3.18 x 8.18
≥5500
Representative dimensions for Grade 2 heavy build rectangular
copper wire. Custom sizes (0.0125 mm² – 25 mm²) and film grades
available. Rounding radius of corners can be tailored.
Why AIW Rectangular Wire for High-Density Windings?
Higher Copper Fill Factor
20-30% more copper in same winding area vs round wire → lower I²R
losses
Class 220 Polyamide-Imide
Excellent thermal stability, cut-through ≥320°C, ideal for harsh
conditions
Grade 2 Heavy Build
Enhanced turn-to-turn insulation, ideal for high-voltage EV &
inverter applications
Precision Rectangular Profile
Excellent shape retention & winding stability for edge-wound
coils
AIW rectangular enameled copper wires are specially engineered for
applications where space efficiency and thermal performance are
critical. Polyamide-imide insulation (Class 220) offers outstanding
resistance to heat, chemicals, and mechanical stress. Compared to
traditional round wires, the rectangular cross‑section maximizes
copper fill within a given slot or window, significantly reducing
winding losses. CHINGCUNG’s advanced die-forming and multi‑pass
annealing ensure tight dimensional control with uniform Grade 2
insulation. The heavy build (Grade 2) adds a reliable dielectric
barrier, suitable for traction motors, dry-type transformers,
high-frequency inductors, and EV charging systems.
Differentiators (Custom Attributes)
Thermal index:220°C (Class 220)
Insulation structure:Polyamide-imide
Corner radius:R0.4 – R1.5 mm (customizable)
Coating uniformity:Grade 2 deviation ≤ ±0.004 mm
Surface quality:Low friction, high abrasion resistance
Monthly capacity:100 tons (special wires including rectangular)
Spool Specifications (for AIW Rectangular Wire)
Spool Type
d1 [mm]
d4 [mm]
I1 [mm]
I2 [mm]
Spool weight [g]
Nom. net wire weight [kg]*
Spools per box
PL-1
80
20
120
100
240
0.5
8
PL-4
125
25
190
160
860
4
4
P-5
160
20
114
90
290
4
4
P-10
200
25
134
110
500
8
2
P-30
300
31
160
130
1290
25
1
PC400
400
52
260
224
2500
60
1
* Valid for copper wire. For other metals (aluminum, CCA), please
inquire. Other spool types available upon request.
Key Application Fields
EV traction motors,Dry-type transformers,High-frequency inductors,Charging station coils,Railway propulsion,Solar inverter chokes,UPS & industrial power supplies,Wind turbine generators
Technical Insight: Grade 2 on Rectangular Wire – Why it matters
For rectangular wires, insulation uniformity across the flat sides
and corners is crucial. CHINGCUNG’s AIW series with Grade 2 heavy
build ensures a minimum film increase of 0.045–0.065 mm (depending
on dimensions) which provides up to 40% higher breakdown voltage
compared to Grade 1. This is especially critical for inverter-fed
motors where voltage spikes stress the winding insulation.
Polyamide-imide insulation also offers excellent resistance to
refrigerants, oils, and harsh chemicals. We supply AIW wires with
automatic concentricity control for demanding high-voltage
platforms.
CHINGCUNG – Engineered for Excellence
§Dedicated rectangular wire production lines with in-line dimension
laser gauges.
§ISO 9001 quality system for high-performance winding wires.
§Monthly capacity 100+ tons of special enameled wires (round +
rectangular).
§Strategic location in Shanghai with fast air/sea freight and global
logistics partners.
§Free engineering support for customized profiles, hybrid insulation
& custom film builds.
Q1: Can I order a sample of AIW Grade 2 rectangular wire for
prototype?
A: Yes. Samples as small as 10–20 Kgs with full test report
(breakdown voltage, dimensions, pinhole) can be produced within 30
days.
Q2: What is the advantage of Grade 2 vs Grade 1 on rectangular
wire?
A: Grade 2 adds approximately 0.015~0.025 mm more insulation per
side, boosting voltage endurance & reducing risk of
turn-to-turn failure in high-stress windings.
Q3: Can you customize aspect ratio and corner radius?
A: Absolutely. We support custom rectangular dimensions, rounded
corners, and flexible film builds to match your coil former.
Q4: Is AIW suitable for oil-immersed transformers?
A: Yes. Polyamide-imide insulation has excellent compatibility with
transformer oils and refrigerants, widely used in hermetic and
oil-filled applications.
Ready to upgrade to high-efficiency rectangular windings? Get a quick quote for AIW Grade 2 wires with your specific
dimensions.
Shanghai Husu M&E Technology Co., Ltd has been a reliable
supplier of high-performance enameled wires since 2015. Under our
brand CHINGCUNG, we serve global manufacturers with quality
products and professional service.
EVMagnetWire.com is our dedicated platform for regular enameled
wires — including copper, aluminum, and copper-clad aluminum
conductors, with thermal ratings from 130L to 240. Our product
range covers polyester, polyurethane, polyesterimide,
polyamide-imide, and polyimide insulation systems, complying with
IEC, GB, NEMA, and JIS standards.
Unlike our specialty wire platform (chingcung.com) which focuses on
self-bonding wires and PMSM motor components, this website is built
exclusively for customers seeking standard, off-the-shelf enameled
wires for motors, transformers, coils, and household appliances.
Our factories are located in Jiangsu and Zhejiang, equipped with
automated painting and baking lines, advanced testing instruments,
and strict quality management systems. With a monthly production
capacity of 100 tons for regular enameled wires, we ensure stable
supply, competitive pricing, and timely delivery to North America,
Europe, and Asia.
Monthly Capacity: 100 tons Standards: IEC, GB, NEMA, JIS Export Markets: North America, Europe, Asia
