G10 vs G11 Insulation Sheet: What Is the Difference?

G10 and G11 insulation sheets are both epoxy glass cloth laminated materials used for electrical insulation and mechanical support parts.

They look similar, and both can be cut, drilled, milled and CNC machined into insulation components.

The main difference is temperature resistance.

G10 insulation sheet is commonly used for standard electrical insulation parts, while G11 insulation sheet is selected when higher heat resistance and long-term thermal stability are required.

In simple terms: Choose G10 for regular insulation parts. Choose G11 for higher-temperature applications.

This guide explains the difference between G10 and G11 insulation sheets, where each material is used, and what buyers should confirm before ordering.

Why G10 and G11 Are Often Compared

Many buyers compare G10 and G11 because both materials are made from epoxy resin and woven glass cloth.

Both materials provide:

• good electrical insulation

• high mechanical strength

• good dimensional stability

• moisture resistance

• good machining performance

• stable performance in industrial electrical applications

From the outside, G10 and G11 sheets may look very similar.

They are often supplied in green, yellow, natural, black or customized colors. They may also be supplied in similar thicknesses and sheet sizes.

However, the internal resin system and heat resistance are different.

That difference becomes important when the material is used in motors, generators, transformers, switchgear or high-temperature electrical equipment.

What Is G10 Insulation Sheet?

G10 insulation sheet is an epoxy glass cloth laminated sheet made by impregnating woven glass cloth with epoxy resin and pressing it under heat and pressure.

It is one of the most commonly used rigid electrical insulation materials.

What Is G11 Insulation Sheet?

G11 insulation sheet is also an epoxy glass cloth laminated sheet, but it is designed for higher temperature performance than G10.

It uses a higher-temperature epoxy resin system, giving it better thermal stability under long-term heat exposure.

G11 is commonly selected when the insulation part must keep its mechanical strength and electrical performance at higher temperatures.

G10 vs G11: Quick Comparison Table

G10 and G11 are not selected by appearance. They are selected by working temperature and application requirement.

When to Choose G10 Insulation Sheet

Choose G10 insulation sheet if:

• the application is a standard electrical insulation part

• operating temperature is not very high

• good mechanical strength is required

• CNC machining is needed

• cost control is important

• the part is used as a spacer, plate, washer or support component

• G11-level heat resistance is not necessary

G10 is often the practical choice for general electrical insulation applications.

It provides reliable insulation and mechanical performance at a more economical cost.

When to Choose G11 Insulation Sheet

Choose G11 insulation sheet if:

• higher temperature resistance is required

• the part is used in a motor or generator

• the application involves long-term heat exposure

• the insulation part must keep mechanical strength under heat

• the equipment has higher reliability requirements

• the design requires a higher thermal grade than G10

G11 is often selected for high-temperature motor slot wedges, generator insulation parts and other demanding electrical insulation applications.

For customers who need better thermal stability, G11 is usually worth the higher material cost.

Common Sheet Sizes and Thickness

G10 and G11 insulation sheets can be supplied in standard sheet sizes or custom sizes.

Common sheet sizes include:
Thickness: 0.5~100mm
Standard size: 1020 × 1220 mm 1220 × 2040 mm 1220 × 2440 mm etc
Color: Green, yellow, natural, black or custom

Processing: Full sheet, cut-to-size, CNC machined parts

Common Applications:

1. G10 or G11 for Motor Slot Wedges

Motor slot wedges are one of the common applications where buyers compare G10 and G11.

For standard motors, G10 slot wedges may be suitable if the temperature requirement is not too high.

For higher-temperature motors, generator windings or heavy-duty applications, G11 slot wedges are often preferred because of their better thermal stability.

2. G10 or G11 for Transformer Support Parts

In transformers, epoxy glass cloth sheets are often used for support blocks, spacers, insulation plates and machined structural parts.

G10 can be used for many standard transformer insulation support parts.

G11 may be selected when the design requires higher temperature resistance or better long-term stability.

FAQ

Q1: What is the main difference between G10 and G11 insulation sheet?

A: The main difference is temperature resistance. G10 is used for standard electrical insulation parts, while G11 is selected for higher-temperature applications.

Q2: Is G11 better than G10?

A: G11 has better heat resistance, but it is also more expensive. It is better only when the application requires higher thermal stability.

Q3: Can G10 and G11 be CNC machined?

A: Yes. Both G10 and G11 sheets can be cut, drilled, milled and CNC machined into insulation parts.

Q4: Are G10 and FR4 the same?

A: They are both epoxy glass cloth laminates, but FR4 is flame-retardant. G10 is not always flame-retardant unless specified.

G10 and G11 insulation sheets are both epoxy glass cloth laminated materials used for electrical insulation and mechanical support.

The main difference is heat resistance.

G10 is suitable for standard electrical insulation parts where good strength, insulation performance and cost control are important.

G11 is selected when the application requires higher temperature resistance and better long-term thermal stability.

For buyers, the right choice depends on the working temperature, insulation requirement, mechanical load, machining drawing and cost target.

Xuchang Chengrui Insulation Material Co.,Ltd. supplies G10 and G11 insulation sheets for motors, transformers, switchgear and industrial electrical equipment.

We can provide full sheets, cut-to-size sheets and CNC machined insulation parts according to customer requirements.