Epoxy Fiberglass Sheets

FR-4 / FR-5 Epoxy Glass Sheet

Flame-retardant epoxy glass sheet for electrical insulation structures, higher thermal reliability and demanding industrial environments.

FR-4 / FR-5 Epoxy Glass Sheet

Product details

Final specifications, performance, and supply scope are confirmed against the application requirements.

Flame-retardant epoxy glass sheet for electrical insulation structures, higher thermal reliability and demanding industrial environments.

Product Summary

Flame-retardant epoxy glass sheet for electrical insulation structures, higher thermal reliability and demanding industrial environments.

How to Select Between the Grades

FR-4 and FR-5 epoxy glass sheets are designed for buyers who require flame-retardant performance together with strong mechanical and electrical properties. FR-4 is the well-known mainstream grade, while FR-5 is selected when higher heat resistance and long-term thermal stability are needed.

Material and Grade Overview

MaterialFlame-retardant epoxy resin with glass fiber reinforcement Grade FocusFR-4 for general industrial use, FR-5 for higher heat performance Key FeaturesArc resistance, dielectric stability and good machinability Typical ColorOften green or industrial natural tone

Available Grades and Dimensions

  • Available grades: FR-4 and FR-5 insulation sheets, including high-performance FR-4 series
  • Thickness range: 0.1 mm to 200 mm
  • Standard sheet sizes: 1020 * 1220 mm, 1020 * 2040 mm, 1220 * 2040 mm and 1220 * 2440 mm
  • Maximum size: 1220 * 3100 mm
  • Available colors: N color (water green), UV yellow and BK black, with custom colors available
  • Product feature: Glass fiber reinforced, high mechanical strength and broad grade availability

Typical Applications

  • High-end electrical insulation panels, barriers and structural support parts
  • Industrial control systems, power equipment and thermal-stable insulation assemblies
  • Applications requiring flame-retardant behavior and better long-term heat reliability
  • Machined custom parts for electrical, electronic and new energy equipment Epoxy Fiberglass Sheets | Product overview

Selection guide

Buyer questions to resolve before quotation

What is the practical selection difference between FR-4 and FR-5?

The page positions both as flame-retardant epoxy glass sheets and FR-5 for higher thermal demand. The exact grade definition, temperature classification, and test values must come from the applicable data sheet and standard.

Can the listed thickness and sheet-size range be assumed for every grade?

No. Confirm grade, thickness, sheet size, color, tolerance, finish, and quantity together because the available manufacturing and stock range can vary by combination.

Which technical values should be compared in a datasheet review?

Use named standards and test methods for flame behavior, thermal classification, flexural performance, dielectric properties, insulation resistance, water absorption, and dimensional stability.

What should the RFQ include for a machined insulation part?

Include the drawing and revision, grade and standard, finished dimensions and tolerances, edge and hole requirements, quantity, inspection plan, documentation, and operating conditions.

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