Polyimide and F46 Film Wrapped Copper Wire

Polyimide & F46 Film Wrapped Wire, also known as sintered wire, is a high-end special hermetic magnet wire designed for fully sealed, harsh-environment electrical equipment. It adopts ≥99.97% high-purity oxygen-free copper as the conductive core; the insulation layer uses dual-sided FEP(F46)-coated polyimide composite film, tightly wrapped around copper conductors under constant tension, then fused and integrated via precise high-temperature sintering process.

After sintering, the F46 adhesive layer fully melts and fuses the multi-layer film into a single seamless, gap-free integral insulation shell without tiny pinholes, slits or interlayer voids that exist in ordinary wrapped wires. The composite structure combines PI's ultra-high temperature resistance and F46's excellent chemical inertness, perfectly resisting transformer oil, refrigerants (R22/R410A/R32), high-pressure water vapor, nuclear radiation and hydrolysis erosion.

Ordinary enamel wire and single PI wrapped wire will crack, swell or suffer insulation breakdown after long-term immersion in oil/refrigerant, which is the core failure cause of submersible pumps and sealed compressors.

Our seamless sintered insulation fundamentally solves this industry pain point, becoming the standard designated winding wire for deep-well submersible motors, hermetic refrigeration compressors, nuclear radiation equipment and fully sealed oil-filled power machinery.

Pain Point 1: Ordinary enamel wire / single film wire has pinholes & gaps, causing refrigerant/oil penetration, turn-to-turn short circuit

Our Solution: High-temperature integral sintering fuses multi-layer PI-F46 film into one seamless whole, zero micro gaps or pinholes. Oil, refrigerant and water vapor cannot penetrate the insulation layer, completely eliminating hidden leakage risks inside sealed equipment.

Pain Point 2 Long-term immersion in refrigeration oil leads insulation swelling, softening and aging failure

Our Solution: F46 fluorine resin has ultra-high chemical inertness, no swelling, hydrolysis or dissolution when soaked in mineral oil, POE and PVE refrigeration lubricants for decades, stable insulation strength without attenuation.

Pain Point 3 Submersible pump motors face alternating cold-hot water temperature cycles, ordinary insulation cracks after repeated thermal shock

Our Solution: PI+F46 composite has outstanding thermal flexibility; it maintains ductility from -60℃ low temperature to 200℃ high temperature, no cracking or delamination after thousands of thermal cycle tests.

Pain Point 4 Nuclear & radiation equipment ordinary insulation degrades under long-term ray irradiation

Our Solution: Polyimide base material has inherent radiation resistance, no carbonization or insulation loss under long low/medium radiation environment, stable long-term operation for nuclear auxiliary motors.

Pain Point 5 Winding embedding and coil forming scratch conventional insulation, triggering partial discharge breakdown

Our Solution: Sintered integral insulation has high tensile & abrasion resistance, withstands extrusion, bending and friction during automated winding without surface damage, lowering motor reject rate greatly.

1. 100% Seamless Sintered Integrated Insulation

Unlike loose layered wrapping of standard magnet wire, our production line adopts closed-loop temperature-controlled sintering furnace to fully fuse F46 adhesive film. No interlayer air gaps or micro pinholes, forming a fully hermetic insulating barrier that completely blocks liquid and gas penetration inside sealed machinery.

2. Ultra-Wide Extreme Temperature Adaptability

Stable mechanical and electrical performance from -60℃ cryogenic cold storage equipment to 200℃ peak overload operation. No embrittlement at ultra-low temperatures, no softening and creep under continuous high temperature overload.

3. Comprehensive Chemical & Radiation Resistance

Resistant to all mainstream refrigerants (R22/R410A/R32/R454C), mineral transformer oil, well water, weak acid and alkali media. The PI substrate resists gamma and neutron radiation, exclusive choice for nuclear industry sealed equipment.

4. Superior Mechanical Winding Performance

High peel strength between film layers and copper core, excellent bending ductility. Even small-radius coil forming will not produce insulation cracks, perfectly matching automatic coil winding, embedding and shaping production lines, reducing production defective rate.

5. Ultra-Long Service Life In Fully Sealed Closed Systems

Under standardized sealed oil/refrigerant operating conditions, the insulation aging attenuation rate is less than 10% after 10,000 hours high-temperature accelerated aging test. Extend the overhaul cycle of submersible pumps and refrigeration compressors by 2–3 times compared with ordinary enamel wire.

Stage 1 Oxygen-Free Copper Conductor Preparation

• High-purity copper rod feeding & multi-stage tungsten carbide precision drawing
• 380–420℃ recrystallization continuous annealing to improve winding flexibility
• Eddy current full inspection to eliminate copper wire surface scratches and internal metal inclusions
• Qualified copper wire spool storage for wrapping process

Stage 2 PI-F46 Composite Film Wrapping & Sintering

• Double-sided F46 coated PI composite film automatic unwinding, constant tension spiral multi-layer wrapping
• Closed-loop precise temperature control tunnel sintering furnace for integral fusion forming
• Online real-time insulation thickness & surface defect camera inspection

Stage 3 Finished Product Full Performance Testing

• Hi-pot dielectric breakdown voltage test
• Long-term oil/refrigerant immersion aging simulation test
• High-low temperature cycle bending crack test
• Radiation resistance spot check (for nuclear customized models)
• Dimensional sorting & digital fixed-length metering

Stage 4 Moisture-Proof Export Packaging

• Anti-static film full wrapping for each spool
• Foam separators to prevent insulation scratch during stacking
• Wooden/plastic spool finished storage

Solution 1 Deep Oil Well / Underground Submersible Pump Motor

Matching Product MF Round / MYFB Flat Sintered Wire
Customer Pain: Long-term immersion in mineral oil + well water, large temperature difference between underground and ground, ordinary wire easy short circuit after 1–2 years operation
Our Solution Seamless sintered insulation blocks water and oil penetration, stable under alternating hot-cold underground environment, extend pump service life to 8–10 years, reduce customer replacement & maintenance cost.

Solution 2 Hermetic Refrigeration Compressor (Air Conditioner / Heat Pump / Refrigerator)

Matching Product Round MF Sintered Wire
Customer Pain: Refrigerant + lubricating oil long-term soaking, frequent startup thermal shock, winding burn-out after short service life
Our Solution F46 fluorine layer is compatible with all mainstream refrigerants, no swelling or hydrolysis, fully sealed insulation avoids refrigerant leakage breakdown, suitable mass production of household and commercial hermetic compressors.

Solution 3 Nuclear Power Auxiliary Sealed Motors & Radiation Equipment

Matching Double-layer Sintered PI-F46 Wire
Customer Pain Equipment under long-term ray radiation, conventional insulation carbonizes and loses insulation performance
Our Solution Radiation-resistant polyimide substrate, passed nuclear-grade aging test, meets safety standards of sealed nuclear auxiliary drive motors.

Solution 4 High-Temp Fully Sealed Oil-Filled Industrial Motors

Matching Flat MYFB Sintered Wire
Customer Pain Internal transformer oil long-term soaking, overload peak temperature up to 200℃
Our Solution Class 200 high-temperature rating, oil hydrolysis resistant, compact flat structure improves slot fill factor for small high-power sealed motors.

Solution 5 Cryogenic Low-Temperature Sealed Machinery Motors

Custom Low-Temp Enhanced Sintered Wire
Customer Pain Equipment running under -40℃ ~ -60℃ cold storage environment, ordinary insulation brittle and easy crack
Our Solution Composite film maintains flexibility at ultra-low temperature, no cracking after repeated startup thermal cycles for cold storage sealed drive motors.

Packaging Standards

• Inner Winding Carrier Heavy-duty solid wooden spools / thickened tapered plastic spools
• Inner Protection Each spool fully wrapped with anti-static moisture PE film, foam isolation blocks to avoid insulation scratch
• Export Outer Package IPPC fumigated wooden cases, Euro standard fumigated anti-collision pallets
• Domestic Conventional Packaging General wooden pallets with full stretch film wrapping

Order & Delivery Information

• Minimum Order Quantity: 1 Ton
• Standard Production Lead Time: 2–4 Weeks
• Urgent Sample / Small Batch Priority Production: 7–10 Working Days
• Global Transport Modes Sea freight, air freight, full-truck land transport, combined container door-to-door delivery, covering Asia, Europe, North America, Middle East and global refrigeration & oil equipment manufacturers

PI F46 sintered film wrapped wire, Class 200 sealed motor magnet wire, submersible pump winding wire, hermetic refrigeration compressor wire, oil & refrigerant resistant winding conductor, radiation resistant nuclear motor wire, seamless sintered copper wire

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