240-Class Polyimide Enameled Copper Wire
Aromatic polyimide magnet wire, engineered for environments where wires of regular thermal classes cannot perform. The film holds its dielectric strength through 240 °C service and withstands a 500 °C cut-through for two minutes — the insulation of choice for aerospace actuators, smoke-extraction fans and high-temperature automotive windings.
- Thermal class
- 240
- Standards
- MW 16-C · IEC 60317-46
- Diameter
- 0.250 – 1.500 mm
- Insulation
- Aromatic polyimide
What Is 240-Class Polyimide Magnet Wire?
240-class polyimide magnet wire is an enameled copper wire rated for a thermal class of 240 °C. A high-purity copper conductor is insulated with an aromatic polyimide resin film, giving stable dielectric performance at sustained high operating temperatures.
Why aromatic polyimide
Aromatic polyimide is the highest-performing enamel chemistry in common magnet-wire use. It keeps its dielectric strength and mechanical integrity at temperatures that degrade conventional dual-coat films, and it resists the solvents and varnishes used in high-temperature insulation systems — which is why it is the default choice for aerospace and safety-critical windings.
What you get
- Outstanding heat resistance — stable dielectric performance at sustained 240 °C service
- Cut-through withstands 500 °C for 2 minutes without breakdown
- Excellent chemical resistance to common solvents and impregnating varnishes
- Consistent film build, lot after lot — every production lot is tested in Jingda’s CNAS-accredited laboratories
Jingda Enameled Copper Wire Range
Select on the continuous operating temperature of your winding first, then on the insulation system and whether the termination process needs direct soldering through the enamel.
| Product | Thermal class | Insulation | IEC | NEMA | JIS | Direct soldering |
|---|---|---|---|---|---|---|
| Viewing240-Class Enameled Copper Wire | 240 | Polyimide | IEC 60317-46 | MW 16-C | PIW | No |
| 220-Class Enameled Copper Wire | 220 | Polyamide-imide | IEC 60317-57 | MW 37-C | AIW | No |
| 200-Class Enameled Copper Wire | 200 | Polyester-imide + Polyamide-imide | IEC 60317-13 | MW 35-C · MW 73-C | EI/AIW | No |
| 180-Class Enameled Copper Wire | 180 | Polyester-imide | IEC 60317-8 | MW 30-C | EIW | No |
| 155-Class Enameled Copper Wire | 155 | Polyester | IEC 60317-3 | MW 5-C | PEW | No |
| 180-Class Solderable Enameled Copper Wire | 180 | Polyurethane | IEC 60317-51 | MW 82-C | UEW | Yes |
| 155-Class Solderable Enameled Copper Wire | 155 | Polyurethane | IEC 60317-20 | MW 79-C | UEW | Yes |
Aluminum conductors are available across comparable classes — see enameled aluminum wire and copper-clad aluminum wire. For flat and other profiles, see shaped magnet wire.
240-Class Polyimide Magnet Wire Specifications
| Parameter | Value |
|---|---|
| Standards | IEC 60317-46 · NEMA MW 16-C |
| Jingda type designations | NEMA JDMW16C | JIS PIW | IEC QY-*/240 |
| Production diameter range | 0.250 – 1.500 mm |
| Published dimensional table | Selected sizes 0.300 – 1.120 mm; other sizes by specification review |
| Conductor | High-purity copper, ≥ 99.95% Cu |
| Insulation build | Grade 1 (Single) · Grade 2 (Heavy) · Grade 3 (Triple) |
| Solderability | Not designed for direct soldering through the enamel |
| Certifications & compliance | UL Recognized · RoHS and REACH reports available above |
| Nominal Ø (mm) | Max overall Ø (mm) | Min breakdown voltage (V) | Resistance at 20 °C (Ω/m) |
|---|---|---|---|
| 0.300 | 0.352 | 4100 | 0.2336 – 0.2507 |
| 0.500 | 0.566 | 4600 | 0.08462 – 0.08959 |
| 0.800 | 0.884 | 4900 | 0.03305 – 0.03500 |
| 1.120 | 1.217 | 5000 | 0.01688 – 0.01786 |
Performance and Applications
Thermal class 240, heat shock 260 °C — verified on every production lot.
Typical Applications
Quality and Compliance
Every production lot is tested in Jingda’s CNAS-accredited laboratories against the applicable product specification and agreed requirements. The 240-class range is UL Recognized under File E174580 and manufactured under an ISO 9001 quality system.
Product Datasheet
Complete dimensional, electrical and thermal tables for every published size and build.
View DatasheetQuality Certificates
Substance Compliance
Tongling Jingda Special Magnet Wire Co., Ltd.
We are one of the world’s leading magnet wire manufacturers, based in Tongling City — one of China’s principal copper production bases. Listed on the Shanghai Stock Exchange since 2002 (600577), the group runs a national-level enterprise technology centre, a national-level postdoctoral research station and the Jingda Magnet Wire Research Institute.
Jingda magnet wire is wound into products across new-energy vehicles, photovoltaics, robotics, aerospace, home appliances, specialty motors, 5G communications and electronics.
Ordering, Packaging and Delivery
| Commercial term | Detail |
|---|---|
| Minimum order quantity | 600 kg per type and conductor diameter. Sample and pilot-order quantities are agreed case by case. |
| Lead time | Stock available: dispatch from the next working day. Scheduled production: normally within 30 days, confirmed per order. |
| Incoterms | FOB by default; other Incoterms on request. |
| Quotation response | Within 1 business day. |
Spool types and pallet configuration — copper wire
Single spools for samples or small orders are packed individually in a wooden case or paper drum. Volume shipments use fumigation-free wooden pallets, with cartons or fibreboard collars protecting the spools and stretch film securing the load.
| Spool type | Average wire weight (kg) | Pallet size (mm) | Spools per pallet | Max layers |
|---|---|---|---|---|
| PT-25 | 25 | 1030 × 1030 | 16 | 2 |
| PT-45 | 40 | 1100 × 1100 | 16 | 1 |
| PT-60 | 50 | 1030 × 1030 | 9 | 1 |
| PT-90 | 80 | 1100 × 1100 | 9 | 1 |
Average wire weights are nominal. Exact spool weight and pallet build are confirmed per order.
Frequently Asked Questions
How do I choose between 240-class and 220-class copper wire?
What does the 500 °C cut-through rating mean?
Is this wire compatible with impregnating varnishes?
Is this polyimide magnet wire directly solderable?
Can Jingda supply sizes outside the published 0.300–1.120 mm table?
Can we become a Jingda distributor or agent?
How does Jingda support customers after the order?
Request a Quote or Sample
Tell us your specification — a Jingda sales engineer will respond within 1 business day with a quotation or technical feedback.
