High-Density Insulation Pressboard:
The Core Dielectric Material for Power Transmission Equipment
G4-ST high-density insulation pressboard is a premium cellulose-based insulating material engineered for high-voltage and heavy-duty electrical systems. Manufactured from imported electronic-grade 99.9% unbleached sulfate softwood pulp, it features zero impurities, no binders, and freedom from metallic, inorganic, and organic particulate contaminants, ensuring exceptional purity and consistent electrical performance-key advantages that make it an indispensable dielectric material in the oil-paper composite insulation structure of power transmission equipment.
Key Features
Superior Electrical & Mechanical Performance: High dielectric strength, excellent tensile strength, good elongation, low compressibility, and strong bending resistance, providing reliable insulation and structural support for electrical components.
Thermal & Aging Stability: Outstanding heat resistance and anti-aging properties, maintaining structural integrity under prolonged high-temperature operating conditions, suitable for long-term use in harsh electrical environments.
Optimal Processability: Excellent flexibility, flatness, and machinability for precise cutting, punching, and forming into complex insulation components, adapting to diverse equipment assembly needs.
Oil Compatibility: Fully compatible with transformer oil, enabling stable performance in oil-immersed insulation systems, which is crucial for core power equipment like transformers and reactors.
Strict Quality Compliance: Manufactured to IEC 60641-3-1 international standard and GB/T 19264.3-2013 (Grade B.3.1A) Chinese national standard, ensuring consistent quality and compliance with global industry requirements.
Specifications
Standard Thickness: 1.0–9.0 mm
Standard Sizes:
2100 × 4200 mm
3200 × 4200 mm
2200 × 4400 mm
3200 × 4400 mm
Customization: Available in custom cuts and dimensions per client requirements, catering to the unique insulation needs of different equipment and projects.
Main Applications
Leveraging its excellent comprehensive performance, G4-ST high-density insulation pressboard is widely used in various high-voltage electrical and industrial fields, serving as a core insulation and structural component:
Power Transformers & Reactors: Used as partitions, spacers, coamings, end rings, and insulation supports inside oil-immersed transformers and reactors, isolating high-voltage circuits, withstanding mechanical pressure, and working harmoniously with transformer oil for long-term stability.
High-Voltage Electrical Equipment: Applied in high-voltage switchgear, high-voltage distribution cabinets, large and medium-sized motors, and generators as insulation liners, separators, and structural insulation substrates, ensuring safe operation of high-voltage components.
Rail Transit & Industrial Equipment: Used in insulation components of rail transit traction electrical systems and industrial high-voltage control equipment, adapting to the harsh operating environment of transportation and industrial sites.
Emerging High-End Fields: Applied in new energy power generation supporting equipment, energy storage power conversion devices, aerospace on-board electrical insulation, and high-voltage wire and cable insulation reinforcement accessories, meeting the high-standard insulation needs of emerging industries.
Why Choose G4-ST High-Density Insulation Pressboard?
In high-voltage environments, material purity and reliability directly impact equipment safety and service life. G4-ST pressboard's 100% pure cellulose composition (no additives), rigorous manufacturing standards, balanced electrical-mechanical properties, and wide applicability across key industries make it the preferred choice for critical insulation components in modern power infrastructure and high-end industrial equipment.