Differences Between G11 Epoxy Sheet and EPGC308

Many customers are unclear about the differences between G11 epoxy sheet and EPGC308 epoxy sheet. Today, we will anal...

Many customers are unclear about the differences between G11 epoxy sheet and EPGC308 epoxy sheet. Today, we will analyze this in detail from the perspectives of epoxy sheet material classification, standards, performance, and application scenarios.

Basic Concept Comparison

G11 Epoxy Sheet

G11 is a glass-fiber–reinforced epoxy resin laminated sheet defined under the NEMA (National Electrical Manufacturers Association) standard. It is manufactured by impregnating woven fiberglass cloth with epoxy resin and curing it under high temperature and pressure.
G11 is a material category, not a single product model. Depending on formulation and certification, it may meet different thermal classes, such as Class F or Class H.

Typical Characteristics of G11:
High mechanical strength
Excellent electrical insulation properties
Thermal class typically 155°C (Class F) or 180°C (Class H), depending on grade
Available with different flame-retardant and electrical ratings (UL / IEC compliant)

EPGC308 sheet

EPGC308 is a specific material designation under IEC standards (International Electrotechnical Commission). It belongs to the EPGC epoxy glass laminate family and is generally equivalent to G11 Class H material.
The EPGC series includes multiple grades such as EPGC201, 203, 204, 306, and 308. Among them, EPGC308 is designed for high-temperature applications.

Key Features of EPGC308:

Thermal class H, long-term operating temperature up to 180°C
High mechanical strength and stable dielectric properties
Low water absorption
Good flame resistance (typically UL94 V-0)
Widely used for high-temperature insulation structural parts in motors, transformers, and electrical equipment

Relationship Between G11 and EPGC308

Thermal Performance and Standards

G11 is a NEMA material classification, which may cover both Class F and Class H grades depending on formulation.
EPGC308 is an IEC-defined material grade, typically specified as Class H (180°C).
In practical terms, EPGC308 can be considered the IEC-equivalent of G11 Class H epoxy glass laminate.

Comparison Summary Table

Manufacturer selection

If you are looking for fr4 sheets, please contact XUJU ELECTRICAL. Which is a professional manufacturer of high-quality electrical insulation materials with more than 65 years of manufacturing experience.it can be customized according to the product specifications, thickness and purpose you need.
Contact us now to get detailed product information and quotation. We can also mail samples for free for your testing.