G10, FR4 & G11 Epoxy Sheets: Standard Sizes & Max Thickness

G10, FR4, and G11 epoxy fiberglass sheet sizes, thickness ranges up to 100 mm, material properties, and custom CNC machining solutions from Xujue Electrical.

Standard Sheet Sizes and Maximum Thickness of G10, FR4, and G11 Epoxy Fiberglass Laminates

G10, FR4, and G11 are epoxy glass fabric laminates widely used in transformers, motors, generators, switchgear, and other electrical equipment. These materials offer good electrical insulation properties, mechanical strength, and dimensional stability, making them suitable for insulation barriers, supports, spacers, and CNC-machined components.

When selecting and purchasing these materials, customers typically focus on three key factors: material properties and thermal classification, standard sheet sizes, and maximum available thickness. Although G10, FR4, and G11 share a similar basic structure, they differ in flame-retardant properties, thermal performance, and specific technical characteristics.

1. Comparison of G10, FR4, and G11 Properties and Thermal Performance

Material Selection Recommendations

G10: Suitable for applications requiring high mechanical strength and good electrical insulation properties without specific flame-retardancy requirements.

FR4: Suitable for electrical insulation components that must meet applicable flame-retardancy standards. Confirm the UL 94 rating and the thickness range covered by the relevant certification before purchasing.

G11: Suitable for applications where maintaining mechanical properties at elevated temperatures is a priority, particularly insulation structures requiring enhanced thermal performance.

2. Standard Sheet Sizes for G10, FR4, and G11 Epoxy Laminates

The commonly available sheet sizes for G10, FR4, and G11 epoxy glass fabric laminates are broadly similar. Actual supply specifications depend on the manufacturer’s production equipment, material grade, and manufacturing capabilities.

2.1 Common Sheet Sizes

The dimensions listed above are examples of common or customizable sizes and do not indicate that every size is available from stock. Before placing an order, confirm the material grade, sheet thickness, dimensional tolerances, and supply condition.

For CNC machining applications, larger sheets can help optimize nesting, improve material utilization, and reduce the overall cost of certain machined components.

3. Thickness Specifications and Maximum Thickness of G10, FR4, and G11 Epoxy Laminates

3.1 Common Thickness Specifications

G10, FR4, and G11 epoxy glass fabric laminates are available in various thicknesses depending on the application requirements.

The actual available thicknesses, thickness tolerances, and minimum order quantities should be confirmed according to the material grade and production requirements.

3.2 What Is the Maximum Thickness of G10, FR4, and G11 Epoxy Laminates?

There is no single maximum thickness that applies to every manufacturer and every grade of epoxy glass fabric laminate. Maximum available thickness varies according to the manufacturer’s hot-pressing equipment, lamination process, and quality-control capabilities.

The following ranges can be used as a general guide when requesting quotations:

0.5–50 mm: A commonly available thickness range for sheet materials.

60–100 mm: Availability depends on whether the manufacturer has the necessary thick-laminate production capabilities.

Above 100 mm: Usually requires individual confirmation of the manufacturing process, dimensional tolerances, internal quality, and delivery lead time.

Some specialized suppliers may offer custom laminated sheets measuring 150–200 mm thick or more. However, this should not be considered a standard manufacturing capability for all G10, FR4, or G11 products.

For thick laminates, particular attention should be paid to internal lamination quality, thickness uniformity, flatness, mechanical properties, and electrical performance. Where necessary, request inspection reports corresponding to the specific product and order requirements.

4. G10, FR4, and G11 Epoxy Fiberglass Sheet Supply from Xujue Electrical

Xujue Electrical is a manufacturer specializing in electrical insulation materials. The company can assess supply options for epoxy fiberglass laminates and customized insulation components based on customers’ material requirements, dimensions, and application conditions.

Product Specifications

• Material Grades: G10, FR4, G11
• Standard Sheet Sizes: 1020 × 1220 mm, 1020 × 1020 mm, 1220 × 2440 mm, 1220 × 2040 mm
• Thickness Range: 0.5–100 mm
• Available Colors: Green, water green, white, yellow, and black
• Custom Sizes: Available upon request
• Custom Machining: CNC cutting, drilling, milling, and machining according to customer drawings

Actual availability is subject to confirmation of the material grade, dimensions, thickness, and order requirements.

Custom Insulation Machining Services

In addition to standard epoxy fiberglass sheets, Xujue Electrical can evaluate customized insulation components based on customer drawings, samples, or technical specifications.

Available customization options may include:

• CNC precision cutting, drilling, slot milling, and machining of complex shapes.
• Machining insulation barriers, supports, and spacers to specified dimensions and thicknesses.
• Selecting suitable insulation materials according to operating temperature and service conditions.
• Confirming material grades, technical parameters, and inspection standards based on project requirements.

If you are looking for a supplier of G10, FR4, or G11 epoxy fiberglass laminates, please provide your required dimensions, thickness, material grade, operating temperature, and application details. Our team can then evaluate suitable material specifications and customized manufacturing solutions for your project.