G10 Fiberglass Sheet Supplier Guide: Properties & Applications

What Is G10 Fiberglass Sheet?

G10 insulation fiberglass sheet is a high-strength epoxy fiberglass laminate made by impregnating woven fiberglass cloth with epoxy resin and laminating it under heat and pressure.

The material combines:

• Excellent electrical insulation

• High mechanical strength

• Low moisture absorption

• Good dimensional stability

• Easy machining performance

Because of its balance of strength, insulation and cost, G10 is widely used in electrical equipment, transformers, motors, switchgear and industrial machined parts.

At Chengrui Insulation, we supply G10 fiberglass sheets in full sheets, cut-to-size panels and custom machined parts according to drawings. We support customers who need stable material quality, flexible cutting service and export-ready supply.

Composition of G10 Fiberglass Sheet

G10 consists of: Reinforcement Layer 7628 woven fiberglass cloth

Resin System: Epoxy resin

The fiberglass provides mechanical strength while the epoxy resin provides electrical insulation and dimensional stability.

The laminate is manufactured under high temperature and pressure to create a dense, void-free structure suitable for demanding industrial applications.

Advantages of G10 Fiberglass Sheet

Excellent Electrical Insulation: G10 provides reliable dielectric performance and is widely used in medium-voltage and low-voltage electrical insulation systems.

High Mechanical Strength: Compared with many thermoplastics, G10 offers significantly higher strength and rigidity.

Low Moisture Absorption: The material maintains dimensional stability even in humid environments.

Easy Machining: G10 can be cut, drilled, milled and CNC machined into complex insulation components.

Chemical Resistance: The epoxy resin system provides good resistance to oils, fuels and many industrial chemicals.

Difference Between G10 and G11

Confused about these two materials? Let's cut through the jargon. Both G10 and G11 are epoxy-based fiberglass laminates, but their specs split under pressure—literally.

‌Although both materials are epoxy fiberglass laminates, their temperature performance differs.

‌Strength & Flexibility:‌ G10's rigid—ideal for knife handles or circuit boards. G11 adds a dash of flexibility while keeping strength, surviving brutal vibrations in motors or industrial gear.

‌Material Makeup:‌ Both use glass cloth and epoxy, but G11 packs a finer weave and extra resin for boosted chemical resistance.

‌Price Check:‌ G10's cheaper for everyday projects. G11 costs more, but you're paying for extreme performance.

For most standard electrical insulation applications, G10 is sufficient.

For higher operating temperatures, G11 is usually preferred.

Difference Between G10 and FR4

One of the most common questions from buyers is whether G10 and FR4 are the same.

The materials share a similar structure but differ in flame retardancy. If flame resistance is required by electrical standards, FR4 insulation board is generally recommended.

Available Sizes

Thickness: 0.1mm – 250mm

Standard Sheet Sizes

1020 × 1220 mm

1220 × 2040 mm

1220 × 2440 mm

1020 × 2040 mm

Custom sizes are available.

If your drawing or standard clearly requires flame retardancy, choose FR4.

If your application mainly requires strength, insulation and machining performance, G10 is usually a cost-effective choice.

How to Choose the Right G10 Fiberglass Sheet

When selecting G10 material, consider:

1. Operating Temperature

For temperatures below 130°C, G10 is usually suitable.

For higher temperatures, G11 or FR5 may be a better choice.

2. Mechanical Load

Thicker sheets provide greater rigidity and load-bearing capacity.

3. Machining Requirements

For CNC machining and precision components, tighter thickness tolerances may be required.

4. Electrical Requirements

Confirm dielectric strength and insulation requirements before selecting material thickness.

Why Choose Chengrui Insulation?

Choosing the right supplier is as important as choosing the right material.

For G10 fiberglass sheet buyers, common concerns include unstable thickness, rough machining edges, inaccurate holes, poor packaging, unclear material selection and slow response.

Chengrui Insulation supports customers with both material supply and processing service.

Chengrui Insulation supplies G10 fiberglass sheets for transformer manufacturers, motor factories, switchgear producers, electrical equipment OEMs and insulation component processors.

We provide:

• Full-size sheets

• Cut-to-size panels

• CNC machined parts

• G10 slot wedges

• G10 insulation blocks

• Custom fabricated insulation components

Our engineering team can assist customers with material selection, machining recommendations and insulation design requirements before production.

Frequently Asked Questions

Q1: Is G10 waterproof?

A: G10 has very low water absorption and maintains stable properties in humid environments.

Q2: Is G10 suitable for transformers?

A: Yes. G10 is widely used for dry-type transformer insulation structures and support components.

Q3: What is the difference between G10 and G11?

A: The primary difference is thermal performance. G11 offers higher temperature resistance.

Q4: What is the difference between G10 and FR4?

A: FR4 includes flame-retardant additives and typically meets UL94 V-0 requirements.

G10 fiberglass sheet remains one of the most widely used rigid electrical insulation materials in the electrical industry. Its combination of electrical insulation, mechanical strength, low moisture absorption and machining flexibility makes it suitable for transformers, motors, switchgear and custom industrial components.

Chengrui Insulation supplies G10 fiberglass sheets, FR4 sheets, G11 sheets and custom machined insulation components for global customers.

If you need standard sheets, cut-to-size panels or CNC machined G10 parts, contact us with your thickness, size, quantity or drawing. We will help you choose the right material and provide a quotation.