G-11 / FR-5 High-Temp Glass-Epoxy Laminate

This glass/epoxy laminate offers excellent high-temperature resistance in addition to its superior mechanical and electrical properties. It maintains its strength and insulation performance in both dry and humid conditions, making it suitable for high-temperature environments. The flame resistance is Class II, in accordance with NEMA test method 7.11.

Material Characteristics and Performance

G11/FR5 is produced from woven glass cloth reinforced with a high temperature epoxy resin system. Compared to G 10/FR4, this material offers improved thermal stability and retains its mechanical and dielectric properties at higher operating temperatures. These characteristics make it a preferred choice for components exposed to heat, vibration, and continuous electrical loading.

Current, Inc. offers G11/FR5 in standard sheet sizes of 36″ × 48″ and 48″ × 96″, with cut to size options available. Thicknesses range from 0.005″ to 3.000″, and tubular configurations are available with inside diameters from 0.375″ to 4.000″ and outside diameters from 0.437″ to 5.000″. Sanded surfaces can be provided to support bonding, machining, or secondary finishing.

Fabrication Support for High Temperature Applications

G11/FR5 is commonly machined into insulators, spacers, brackets, structural supports, and electrical components. Current, Inc. provides routing, drilling, turning, and shaping services to deliver parts that meet precise dimensional requirements. Our fabrication team supports prototype quantities and production scale orders, ensuring consistent tolerances and repeatable performance across multiple builds.

Applications Across Multiple Industries

G11/FR5 is used in switchgear, transformer insulation, aerospace components, industrial heating systems, and equipment that operates in elevated temperature environments. Its combination of strength, heat resistance, and electrical stability makes it suitable for assemblies that must maintain performance under thermal stress.

Dimensions:

Sheet:

36″x48″ and 48″x96″

Cut to size available

Saw Kerf – 0.250″

Thickness:

0.005″-3.000″

(Additional thicknesses available upon request)

Sanding:

1 or 2 side sanding with tolerance of +/-0.005″

Tube:

ID: 0.375″ – 4.000″

OD: 0.437″-5.000″

Technical Data Sheet (TDS)

MIL-I-24768/28

Sheet

Tube

Developed as an advanced glass epoxy laminate, G11/FR5 was designed to meet the increasing demands of industries requiring high-performance materials. First introduced to improve upon the already popular G10/FR4, G11/FR5 quickly became the material of choice for applications requiring greater thermal stability and mechanical strength. Over time, it has become a trusted solution in industries such as aerospace, electrical insulation, and heavy machinery, where high temperatures and harsh conditions require materials that won’t compromise on performance. Today, G11/FR5 remains a staple for applications that need robust, heat-resistant materials capable of maintaining their integrity under stress.

FAQs

What types of G11/FR5 products does Current make?

Current manufactures NEMA grade G11/FR5 products. These materials can be fabricated into tubes, rods, and sheets. They can also be machined into spacers, standoffs, and other parts. We can also design one specific to you based on your unique applications. Whatever your manufacturing or assembling needs, there’s a Current Inc. product that will improve your product for an affordable price. Our laminated sheets, standoffs, tubing, rod and spacers are created with precision in mind.

What does G11 and FR5 stand for?

G11 is a thermosetting industrial laminated plastic consisting of a woven glass cloth material and an epoxy resin matrix. The “G” stands for glass epoxy and the “11” denotes specific properties of this type of glass epoxy. Standard G11 is not fire retardant. FR5 is G11 with fire retardant properties that can be used in electrical applications, whereas standard G11 cannot.

How do I start an order?

To start an order, go to our Contact page and fill out a form detailing your interests. This will be received by us, and we will coordinate with you to complete the order. Alternatively, give us a call and we will be happy to work with you in that way as well. You can reach our main office at (203) 469-1337.

How long from placing an order can I expect to get my product?

Our lead times vary based on the market and on the products that you are interested in, but we typically deliver around 4-6 weeks or less from the order being placed, depending on the material we have in stock.