G10 FR4 epoxy fiberglass is a mechanical as well as electrical insulator. This material is epoxy resin impregnated fiberglass mat. This results in a strong, durable, and highly insulating material with fire-resistant properties. It has many uses. Electrical insulation, mechanical parts, and structural supports. Fire-resistant, high-temperature situations employ it. Buildings use it too. It insulates and supports while preventing fires.