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EPGC 308 Epoxy Fiberglass Board

EPGC 308 Epoxy Fiberglass Board

Applications: Insulators, electrical winding insulation, winding wire coating insulation, electrical bases, housings, motors, insulating paint, switch substrates, high voltage and high temperature insulation materials
Thermal rating: High 180
Maximum voltage: 20KV~100KV
Color: yellow-brown/yellow-brown
Thickness: 0.5-80mm
Size:1020*1220 /1020*1020 /1220*2440 /1220*2040 mm(support customize)


EPGC308 epoxy glass fiber cloth laminated sheet thermal resistant for motor slot wedge insulation

Product introduction

EPGC308 is a product made by impregnating epoxy resin matrix onto electronic-grade alkali-free glass fiber cloth and processed through heat pressing. This product meets the requirements of IEC60893-2004 and GB/T 1303.4-2009 standards. It has a brownish yellow color.


1.Remarkable mechanical strength at medium or elevated temperatures, including a tensile elongation of more than 50% even at higher temperatures. This ensures its resilience and ability to withstand mechanical stress effectively.
2.Consistent electrical performance, characterized by an insulation resistance of up to 1012Ω even after being immersed in water. This demonstrates its reliable and stable electrical insulation capabilities.
3.Enhanced dielectric strength under high humidity conditions (exceeding 35kV) when laminated parallel to the layers. This feature makes it particularly suitable for applications requiring dependable electrical insulation in humid environments.


Slot Wedges Machine parts Electromechanical Components
Terminal Boards and Tag Strips Bolt Insulation Presses and moulds
High-Voltage Switches Elements that support very high
dynamic efforts
High frequency equipment



General Properties:
Property Unit of measure Typical Value
Density gc/m3 1.90-2.05
Water Absorption (5mm) % ≤0.04
Flame Retardant UL94
Electrical Properties:
Property Unit of measure Typical Value
Electrical Strength ⊥ kV/mm, thickness=3mm ≥10.2
Electrical Strength ∥ kV ≥45
Tracking Resistance PTI
Insulation resistanceafter immersion 5*104
Mechanical Properties:
Property Unit of measure Typical Value
Flexural Strength MPa ≥340
Tensile Strength MPa ≥300
Compressive Strength ⊥ MPa ≥350
Modulus Of Elastricity MPa ≥24000
Impact Strength ∥ kJ/m2 ≥50
Thermal Properties:
Property Unit of measure Typical Value
Thermal Charactersitices 180
Disclaimer: The above values are based upon routine test data and do not form the basis of a supply contract. These products may be used in a diverse range of applications and whilst every effort is made to ensure the information in this data sheet is accurate, it must be stressed that it is the user’s responsibility to ensure suitability for the intended end use.


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