Phenolics - G-3 - Glass Phenolic

Key Characteristics of G3

G-3 is a thermoset composite material made from woven glass fabric impregnated with a phenolic resin.

It is well known for its good electrical insulation properties, particularly in humid environments, making it an excellent choice for electrical components.

G-3 exhibits moderate mechanical strength and excellent heat resistance, performing reliably at temperatures up to 150°C (302°F). This material has strong arc resistance, making it useful in high-voltage electrical applications.

Additionally, G-3 offers good dimensional stability and low moisture absorption, ensuring consistent performance even in challenging environments. It also provides fair chemical resistance, making it suitable for use in industrial applications that involve exposure to certain chemicals.

How It's Used: Applications of G3:

Explore how this composite material is used across industries:

Electrical Insulators: G-3’s combination of electrical insulation and arc resistance makes it ideal for use in insulators in electrical devices and systems.

Switchgear and Circuit Breaker Components: Due to its arc resistance and electrical insulation

properties, G-3 is commonly used in switchgear and circuit breaker housings and parts.

High-Voltage Equipment: G-3 is frequently employed in high-voltage systems where both

electrical insulation and resistance to heat and humidity are essential.

Transformers: G-3’s ability to perform in humid environments makes it an excellent material for insulating components in transformers.

Arc Barriers: The arc resistance of G-3 makes it suitable for use as barriers in electrical systems to prevent arcing in high-voltage applications.

Industrial Equipment: G-3 is used in industrial machinery that requires components with moderate mechanical strength, heat resistance, and electrical insulation properties.

G3 Technical Specifications

Explore the mechanical and structural properties of Ready Plastic G3

Military/Fed Spec: Mil-1-24768/18 Type GBG
Specific Gravity: 1.85
Tensile Strength (psi): 42,000
Comp. Strength: 76,000
Flexural Strength (psi): 55,000
Hardness, M Scale: 110
Bond Strength: 1,500
Shear Strength (psi): 18,000

Dissipation Factor, 10 cycles, Cond A: 0.023
Dielectric Constant 10 cycles, Cond A: 7.30
Electric Strength V/MIL Cond A: 600
Flammability Rating: 94HB
Max. Oper. Temp C/F: 140/284
Coeff. Thermal Exp. IN/IN/C x 10-5: 1.00
Water Absorption %-24 hrs: 2.00
Izod Impact Strength (ft/lb/in) @ 49 C: 12.00

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