Laminated Pressman Board is a rigid, high-density insulation material designed for use in electrical and thermal applications requiring durability, dielectric strength, and dimensional stability. Manufactured by layering and bonding high-grade cellulose fibers under heat and pressure, this composite board offers superior performance in oil-immersed and dry-type electrical equipment.

Its multi-layered structure enhances mechanical strength, moisture resistance, and electrical insulation properties, making it an ideal choice for transformer partitions, switchgear insulation barriers, and structural electrical components.

 features:

• Excellent electrical insulation and dielectric strength

• High mechanical stability and rigidity under electrical load

• Oil-resistant and thermally stable in high-temperature conditions

• Dimensional consistency and resistance to warping

• Suitable for machining, punching, and shaping

• Available in custom sizes and thicknesses

Technical specifications:

• Material: Laminated cellulose fiber (pressboard composite)

• Thickness range: 1 mm to 50 mm

• Dielectric strength: ≥ 8 kV/mm

• Density: 1.0 to 1.3 g/cm³

• Thermal class: Class A (105°C) or Class B (120°C), depending on grade

• Oil compatibility: Suitable for mineral and ester-based transformer oils

• Standards: IEC 60641, ASTM D3300

Applications:

• Power and distribution transformer insulation

• Oil-filled and dry-type transformer barriers

• Switchgear insulation and support structures

• Electrical motor insulation components

• Capacitor and bushing structural insulation

Engineered for long-term performance, our laminated pressman boards are manufactured to meet stringent industry standards, ensuring reliability in high-voltage and high-temperature environments. They are trusted by OEMs and maintenance engineers for their consistent insulation performance, machinability, and adaptability to custom applications.