FR5 Epoxy Board: Choosing the Right Specifications and Sizes

FR5 epoxy board is a high-performance electronic insulation material. It is widely used in motors, electrical appliances, electronic products, and communication equipment. This material possesses excellent high-temperature resistance, mechanical strength, and electrical insulation properties. With a variety of specifications and sizes available on the market, selecting the appropriate FR5 epoxy board for a specific project is crucial. This article provides a comprehensive selection guide to assist you in making an informed choice.

Why Choose FR5 Epoxy Board?

Before determining specific specifications, let's first understand why FR5 material is suitable for harsh application environments:

Heat Resistance: FR5 has a heat resistance rating of F (155℃). It maintains good mechanical strength even at high temperatures, outperforming FR4 material.

Mechanical Properties: FR5 has high vertical flexural strength, good rigidity, and excellent impact and vibration resistance.

Electrical Insulation Properties: In high-frequency, high-temperature, or high-humidity environments, FR5 maintains stable dielectric constant and dielectric loss, ensuring reliable circuit insulation.

Flame Retardant Properties: FR5 meets UL94 V-0 standards. It effectively inhibits flame spread and improves product safety.

Chemical resistance: FR5 exhibits excellent resistance to most chemical solvents, making it suitable for complex environments.

FR5 Epoxy Board Common Specifications

1. Color

Standard Colors: Yellow, Light Green

Special Colors: Dark Green, Black (Customization Available)

2. Thickness

Optional Range: 0.5 mm – 50 mm

Common Thicknesses: 1 mm, 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, 20 mm, 25 mm, etc.

3. Standard Board Size

1020 × 1220 mm (Common Size)

1220 × 2440 mm (Large Size)

Supports custom cutting into strips, discs, gaskets, support blocks, etc.

4. Temperature Rating

FR5 has a temperature rating of F (150℃). It is suitable for equipment operating at high temperatures for extended periods.

FR5 Epoxy Board Size Selection Guide

When selecting FR5 board specifications, the actual application conditions, including electrical, mechanical, and environmental factors, should be comprehensively considered:

1. Select Thickness Based on Operating Temperature

For operating temperatures above 150℃, it is recommended to use medium-thickness boards (≥5 mm), or determine the precise thickness according to design requirements.

For equipment operating in high-temperature, high-pressure environments for extended periods (such as transformer insulation components), higher strength boards are recommended.

2. Select Thickness Based on Mechanical Strength Requirements

Strength-bearing support components: Recommended thickness 8–20 mm

Electrical partitions, insulating sheets: Recommended thickness 1–5 mm

Machined structural components: Recommended thickness 3–10 mm

3. Select Size Based on Voltage Rating

In high-voltage systems (e.g., 10–40 kV), thicker boards should be selected, ensuring sufficient creepage distance and machining margins.

4. Select Specifications Based on Machining Method

FR5 material is suitable for CNC machining, drilling, turning, and other machining methods. Machining margins should be reserved during material selection to avoid stress deformation caused by hot processing.

5.Consider Cost and Material Utilization

For mass production, it is recommended to arrange and cut according to standard large board size to improve material utilization and reduce waste.

Common Application Scenarios and Selection Recommendations

1. Motors and Electrical Appliances

FR5 is mainly used for motor slot wedges, insulating washers, and transformer insulation boards.

Selection Recommendation: 

Thickness 1.0mm - 5.0mm, focusing on mechanical strength and heat resistance.

Dimensions can be customized according to part drawings to reduce secondary processing.

2. Electronic Equipment

FR5 is mainly used for test fixtures, SMT carrier boards, and insulating supports.

Selection Recommendation: 

Thickness 2.0mm - 10.0mm, requiring high flatness and dimensional stability.

Some applications may require anti-static properties.

FR5 epoxy boards, with their excellent heat resistance, electrical properties, and mechanical strength, are an ideal choice for high-end electrical structural components. Correct selection of specifications and dimensions is crucial to ensuring stable equipment operation. Whether applied to power systems, industrial machinery, or new energy fields, proper selection helps improve product lifespan and safety performance.

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