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Magnetic Slot Wedges

Magnetic Slot Wedges | Epoxy Glass Fabric Magnetic-Conductive Insulation

Magnetic Slot Wedges are advanced motor insulation components manufactured from E-glass fabric impregnated with epoxy resin and specially formulated iron powder, cured under high temperature and high pressure. This composite structure provides an optimal balance of mechanical strength, magnetic permeability, thermal stability, and dimensional precision.

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Magnetic Slot Wedges | Epoxy Glass Fabric Magnetic-Conductive Insulation

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Magnetic Slot Wedges | Epoxy Glass Fabric Magnetic-Conductive Insulation

Magnetic Slot Wedges are advanced motor insulation components manufactured from E-glass fabric impregnated with epoxy resin and specially formulated iron powder, cured under high temperature and high pressure. This composite structure provides an optimal balance of mechanical strength, magnetic permeability, thermal stability, and dimensional precision.

Magnetic slot wedges are installed in the stator or rotor slots of electric motors and generators. Unlike conventional non-magnetic wedges, they actively optimize the magnetic circuit, improving electromagnetic performance while maintaining strong mechanical fixation of windings.

By improving magnetic flux distribution, magnetic slot wedges help reduce iron loss, eddy current loss, vibration, and noise, while also controlling temperature rise and increasing overall motor efficiency. Both electrically insulating and magnetic-conductive (semi-conductive) versions are available, with Thermal Classes B, F, and H to suit different motor designs.

All grades have been tested and approved by international professional laboratories and validated through long-term customer applications.

Available Material Options
Material Grade Description
FR4 Glass epoxy laminate suitable for general electrical insulation applications
G11 High-temperature glass epoxy laminate designed for elevated thermal performance
3240 Epoxy phenolic cotton cloth laminate offering good mechanical strength and machinability
GPO-3 Polyester glass mat laminate with excellent arc resistance and flame retardancy
EPGC308 High-strength epoxy glass cloth laminate for demanding electrical and mechanical conditions
Magnetic Slot Wedge Loss-reducing magnetic composite designed to improve motor efficiency

Each material is selected based on thermal class, voltage level, mechanical stress, and overall efficiency requirements.

Product Details

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Product Name

Magnetic Slot Wedge

Product Type

Motor Slot Insulation & Retention Component

Base Materials

E-glass fabric + Epoxy resin

Structure

Epoxy glass fabric magnetic-conductive laminate

Insulation Class

Class B / F / H

Function

Magnetic circuit optimization & coil retention

Customization

Size, material, thickness as per motor design

NEMA, IEC, Mil Spec Material Comparative Table
NEMA IEC Mil Spec Resin Substrate
NEMA G-10EPGC 201, 21*MIL-I-24768/2 GEEEpoxyGlass Cloth
NEMA FR4EPGC 202, 23*MIL-I-24768/27 GEE-FEpoxyGlass Cloth
NEMA G-11EPGC 203, 22*MIL-I-24768/3 GEBEpoxyGlass Cloth
NEMA FR5EPGC 204MIL-I-24768/28 GEB-FEpoxyGlass Cloth
—EPGC 205—EpoxyGlass Cloth
—EPGC 306—EpoxyGlass Cloth
—EPGC 307—EpoxyGlass Cloth
—EPGC 308—EpoxyGlass Cloth
—EPGC 309—EpoxyGlass Cloth
—EPGC 310—EpoxyGlass Cloth
—EPGC 311—EpoxyGlass Cloth
—EPGM 203—EpoxyGlass Mat
—EPPC 301—EpoxyPolyester Cloth
NEMA G-5MFGC 201, 20*MIL-I-24768/8 GMGMelamineGlass Cloth
NEMA G-9MFGC 201MIL-I-24768/1 GMEMelamineGlass Cloth
NEMA CPFCC 201, 23*MIL-I-24768/16 PBMPhenolicCotton Cloth
NEMA CEPFCC 202, 22*MIL-I-24768/14 FBGPhenolicCotton Cloth
NEMA LPFCC 203MIL-I-24768/15 FBIPhenolicCotton Cloth
NEMA LEPFCC 204, 21*, 24*MIL-I-24768/13 FBEPhenolicCotton Cloth
NEMA XPFCP 201, 21*MIL-I-24768/12 PBMPhenolicCellulosic Paper
NEMA XPPFCP 201MIL-I-24768/19 PBM-PPhenolicCellulosic Paper
NEMA XXXPFCP 204MIL-I-24768/10 PBEPhenolicCellulosic Paper
NEMA XXPFCP 202, 23*MIL-I-24768/11 PBGPhenolicCellulosic Paper
NEMA XXPPFCP 203MIL-I-24768/21 PBG-PPhenolicCellulosic Paper
NEMA XXXPPFCP 204MIL-I-24768/22 PBE-PPhenolicCellulosic Paper
NEMA XPCPFCP 207MIL-I-24768/20 PBM-CPhenolicCellulosic Paper
NEMA G-3PFGC 201, 21*MIL-I-24768/18 GPGPhenolicGlass Cloth
NEMA GPO-1UPGM 201MIL-I-24768/4PolyesterGlass Mat
NEMA GPO-2UPGM 202MIL-I-24768/5PolyesterGlass Mat
NEMA GPO-3UPGM 203MIL-I-24768/6PolyesterGlass Mat
—UPGM 205—PolyesterGlass Mat
—PIGC 301—PolyimideGlass Cloth
NEMA G-7SIGC 201, 21*MIL-I-24768/17 GSGSiliconeGlass Cloth
Note:
1 – Comparable grades can vary slightly in specification based on test methods and thickness.
* Indicates IEC tube standard.

Applications of our Products
Main Application Areas
  • Industrial Motors – Slot insulation for pumps, fans, and compressors
  • New Energy Vehicles (EVs) – Rotor slot wedges for traction motors
  • Wind Turbines – Stator slot fixation in large generators
  • High-Efficiency Motors (IE4 / IE5) – Magnetic slot wedges for loss reduction
  • High-Voltage Motors – GPO-3 and EPGC308 for enhanced insulation safety
Material Selection Guide
  • FR4 / G11 – Recommended for standard industrial motor applications
  • GPO-3 / EPGC308 – Suitable for high-voltage or humid operating environments
  • Magnetic Slot Wedge – Ideal for energy-efficient and premium motor designs
Applications - PVC coated fiberglass sleeve

Key Features

Excellent Electrical Insulation

Superior Thermal Resistance

High-performance Protection

Industries We Serve

Explore the Wide Range of Industries We Proudly Serve

Providing reliable and high-performance insulation solutions across various sectors.
IN 1.0
Transformer And Coil Construction
IN 2.0
Motor Constructions
IN 3.0
Generator Construction
IN 4.0
High Temperature Applications
IN 5.0
Electrical Vehicles
IN 6.0
Capacitor Construction
IN 7.0
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Certification

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UL
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ISO 9001:2015
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Inquiries and Custom Solutions

Find your right electrical insulation materials with us!

You have questions according to our insulating or want to send an inquiry? Our sales representative will be happy to help you.
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