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Fiberglass Epoxy Slot Wedge

Fiberglass Epoxy Slot Wedge | Motor Slot Insulation & Coil Retention Component

A Fiberglass Epoxy Slot Wedge is a critical insulating and mechanical component used in the stator or rotor slots of electric motors and generators. Its primary function is to secure winding coils firmly inside the slot, preventing displacement caused by electromagnetic forces, vibration, or centrifugal stress during motor operation.

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Fiberglass Epoxy Slot Wedge | Motor Slot Insulation & Coil Retention Component

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Fiberglass Epoxy Slot Wedge | Motor Slot Insulation & Coil Retention Component

A Fiberglass Epoxy Slot Wedge is a critical insulating and mechanical component used in the stator or rotor slots of electric motors and generators. Its primary function is to secure winding coils firmly inside the slot, preventing displacement caused by electromagnetic forces, vibration, or centrifugal stress during motor operation.

In addition to mechanical retention, slot wedges provide electrical insulation, structural support, and controlled heat dissipation paths, contributing directly to motor reliability, efficiency, and service life. Depending on performance requirements, fiberglass epoxy slot wedges are manufactured from various high-performance laminated insulation materials suitable for different voltage, temperature, and efficiency classes.

These sheets maintain stable electrical properties in dry, humid, and oil-exposed environments, making them ideal for electrical equipment, heating systems, and high-temperature industrial applications.

Available Material Options
Material Grade Description
FR4 (F881) Glass epoxy laminate suitable for general electrical insulation applications
G11 (F882) High-temperature glass epoxy laminate designed for elevated thermal performance
3240 Epoxy phenolic cotton cloth laminate offering good mechanical strength and machinability
GPO-3 (F622) Polyester glass mat laminate with excellent arc resistance and flame retardancy
EPGC308 (F886) High-strength epoxy glass cloth laminate for demanding electrical and mechanical conditions
Magnetic Slot Wedge (F897) 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

Fiberglass Epoxy Slot Wedge

Product Type

Motor Slot Insulation & Retention Component

Base Materials

FR4, G11, 3240, GPO-3, EPGC308, Magnetic Composite

Insulation Class

Class F / Class H

Operating Temperature

155 °C – 180 °C

Flame Retardancy

UL94 V-0 (material dependent)

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
Miscellaneouse
Certification

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Certifications

UL
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CE
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RoHS
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ISO 9001:2015
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REACH Compliant
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Electrical Research
and Development
Association
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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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