G4 High-voltage Transformer Insulating Pressboard is manufactured from 100% high-purity sulfate wood pulp through hot-pressing technology. As an essential dielectric material in the oil-paper composite insulation systems of transformers and transmission equipment, it provides reliable insulation and mechanical support. This product also serves as a key base material for high-voltage molded components, playing a vital role in the domestic production of ultra-high voltage power grid transmission equipment.

Advantages of Transformer Insulating Pressboard:

• Premium Raw Materials – Made from imported electricity-grade unbleached sulfate coniferous wood pulp, sourced from high-cold zone conifers with high polymerization degree. The fibers offer uniform molecular weight distribution, high purity, flexibility, and strong hydrogen bonding, ensuring excellent insulation, anti-aging, and mechanical performance.

• Advanced Beating Technology – Utilizing precisely controlled pre-infiltration, isobaric, constant-temperature, constant-flow, and constant-concentration beating processes. This guarantees optimal fiber length, hydration, uniformity, and inter-fiber binding strength.

• High-Purity Water System – A multi-stage water purification system maintains production water resistivity above 2 MΩ·cm, ensuring high cleanliness and consistent insulation quality.

• Enhanced Purification Process – Incorporates pulp deionization treatment to reduce ash content and improve insulation properties. The production line features a full-ceramic-liner high-concentration desanding system, insulated slurry tank surfaces, efficient magnetic desanding devices, low-concentration non-foaming desanding technology, and a secondary fiber screening system for superior product purity and performance.
  

Application:

G4 pressboard meets the stringent insulation requirements of critical components in EHV/UHV AC/DC transformers, reactors, and UHV switches. It is widely used for transformer layer insulation, coil winding, and other specialized insulation applications in high-voltage electrical equipment.