FR4 G10 Epoxy Fiberglass Insulation Tube

FR4 / G10 epoxy fiberglass insulation tube is a rigid laminated insulation tube made from woven fiberglass cloth and epoxy resin under heat and pressure. It is widely used in electrical and industrial applications where both mechanical strength and electrical insulation are required.

These tubes are commonly selected for:

• transformer insulation structures

• motor insulation supports

• switchgear components

• bushings and sleeves

• machined electrical insulation parts

• industrial structural insulation applications

For many industrial buyers, FR4 / G10 tubes are practical because they combine rigidity, dielectric reliability and machining suitability in one material.
Chengrui Insulation also offers FR4 Insulation Sheet and G10 Insulation Sheet

Difference Between FR4 and G10

FR4 and G10 are very similar in base structure. Both are glass epoxy laminated materials.

The main practical difference is:

FR4 is generally the flame-retardant grade

G10 is generally the non-flame-retardant grade

Key Features & Advantages:

Superior Electrical Insulation: Excellent dielectric properties make it ideal for high-voltage environments.

Exceptional Mechanical Strength: High rigidity and durability for demanding structural uses.

Wide Thermal Performance:

Standard operating range: -40°C to +70°C

With specialized high-temp resin: withstands over 200°C

Inherently flame-retardant (FR4 grade)

Low-Friction, High-Efficiency Bore: The exceptionally smooth inner wall boasts a friction coefficient (n=0.0084) significantly lower than concrete (0.014) or cast iron (0.013) pipes, enabling superior flow characteristics and transport efficiency.

Our epoxy resin fiberglass tubes are manufactured using vacuum casting technology within a controlled cleanroom environment, ensuring superior performance and exceptional product reliability.

These epoxyglass insulation tubes are extensively utilized in:

High-Voltage Electrical Equipment: Ideal for components in circuit breakers, isolation switches, and earthing switches, suitable for voltage levels ranging from 35kV to 1100kV.

Industrial Pipeline Systems: Widely applied in demanding pipeline applications, including waste lines, petrochemical transfer lines, and tank connection systems.

Applications

1. Electrical Equipment Insulation

FR4 G10 fiberglass insulation tube can be used as insulating structural parts in electrical appliances and electrical equipment.

2. Transformer Insulation

The tube can be used in transformer insulation systems where rigid insulating components are required. Because the material can be used in transformer oil and humid environments, it is suitable for transformer manufacturing and maintenance applications.
3. Motor and Generator Insulation
FR4 G10 fiberglass insulation tube is suitable for motors and generators requiring rigid insulation parts with good dielectric performance.
4. Custom Machined Insulation Parts
FR4 G10 fiberglass tube can be further processed according to customer drawings.
Common machining options include: cutting to length, drilling, slotting, CNC machining. Chengrui can supply standard fiberglass insulation tubes or customized machined insulation parts according to customer requirements.

FAQ

Q1: What is FR4 G10 fiberglass insulation tube?

A: FR4 G10 fiberglass insulation tube is a rigid epoxy glass fiber insulation tube made from alkali-free glass fiber cloth impregnated with epoxy resin and processed under heat and pressure.

Q2: What is the difference between FR4 and G10 fiberglass tube?

A: Both are epoxy glass fiber insulation materials. G10 is a standard epoxy glass grade, while FR4 has better flame retardant performance.

Q3: Can G10 fiberglass tube be used in transformer oil?

A: Yes. G10 fiberglass insulation tube can be used in humid environments and transformer oil.

Chengrui Insulation supplies FR4 / G10 epoxy fiberglass insulation tubes for transformer manufacturers, motor factories, switchgear producers, insulation parts processors and industrial distributors. We can provide tubes in different diameters, wall thicknesses and lengths, and we also support machining according to customer drawings.