High-density G4 Transformer Pressboard Insulation

High-density G4 Transformer Pressboard Insulation

G4 Transformer Pressboard is a high-density, vulcanized cellulose electrical insulation board engineered for critical electrical applications. Conforming to NEMA G4 standards, it delivers exceptional mechanical strength, reliable dielectric properties, and long-term stability in demanding environments such as power transformers, electric motors, and heavy-duty switchgear. This premium pressboard is specifically engineered for transformers rated 110kV to 750kV and above.

With an optimized apparent density of 1.0-1.3 g/cm³, this premium pressboard delivers unmatched dimensional stability and mechanical integrity under continuous mechanical stress, thermal cycling, and high-voltage conditions.

Our G4 grade is manufactured through a proprietary, high-pressure processing of refined sulfate wood pulp. This advanced process ensures uniform fiber orientation and superior compaction, eliminating the need for additional sizing or fillers. The result is a hard, dimensionally stable material with fiber-free surfaces, guaranteeing consistent performance and structural integrity even under extreme electromagnetic forces and short-circuit stresses.

Performance Specifications of G4 transformer pressboard (High Density)

• Superior Dielectric & Thermal Performance: Exhibits excellent oil absorption (>10%), which, upon impregnation, significantly enhances both dielectric strength and thermal conductivity, ensuring efficient cooling and reliable insulation throughout the transformer's lifecycle.

• Guaranteed Mechanical Robustness: Its high density translates into exceptional compressive strength, crucial for maintaining precise oil duct geometry and preventing deformation under long-term operational loads.

• Material Purity & Compatibility: Manufactured with high chemical purity, our G4 board ensures full compatibility with all standard transformer oils, preventing contamination and preserving the fluid's insulating properties.

• Proven Thermal Endurance: Rated for Thermal Class A (105°C) per IEC 60085, it guarantees stable performance and longevity at continuous operating temperatures.