High Density Electrical Pressboard For Transformer Insulation

High density electrical pressboard for transformer insulation serves as the core substrate for structural insulation parts of transformers. Manufactured from 100% high-purity sulfate wood pulp through high-temperature high-pressure pressing processes, it achieves densities between 1.0 and 1.3g/cm³ versus approximately 0.7g/cm³ for ordinary pressboard. Higher density delivers superior mechanical strength, enhanced breakdown voltage and reduced moisture absorption for stable insulation performance. Nearly all transformer structural insulation components including blocks, support strips, angle rings, insulation cylinders and clamping piece insulation are processed from electrical pressboard, meaning pressboard quality directly impacts overall transformer mechanical reliability and insulation service life.

A transformer insulation component processing factory previously relied on imported electrical pressboard suffering severe cost pressure. They requested samples covering thicknesses from 0.5mm to 4mm, and compression strength testing revealed our product delivers 65MPa compression strength versus 68MPa for imported alternatives with nearly matching performance at a 40% price reduction. They now place stable monthly orders of 5 tons delivering substantial cost savings. Our high density electrical pressboard for transformer insulation achieves vertical breakdown voltage of 15kV/mm, horizontal breakdown voltage of 8kV/mm, bending strength of 100MPa and water absorption rate below 1.5%, with all indicators fully complying with national standards. For distributors supplying transformer accessories, reliable stable electrical pressboard forms your core base product portfolio with extremely high repeat purchase rates as customers maintain monthly consumption demand.

• Processing of transformer blocks, support strips and angle rings
• Transformer insulation cylinders and clamping piece insulation
• Structural insulation parts of oil-immersed transformers
• Insulation partitions of current transformers and reactors
• Structural insulation parts for all types of power equipment

Our factory operates complete deep processing production lines for electrical pressboard with full independent processing capability from raw paper slitting to stamping forming. We are equipped with high-precision slitting machines, stamping forming machines and sawing machines to cut large sheets into custom-sized small panels or open molds for stamping special-shaped parts per your drawings. The factory covers 2,000 square meters with an annual production capacity of 2,000 tons and ready stock maintained for multiple thickness specifications enabling immediate shipment of standard sizes. Our technical team possesses years of experience in transformer industry standards and processing technology to assist customer part design optimization and material utilization rate improvement for procurement cost reduction. Products are domestically supplied to well-known electrical enterprises including Delixi, Tengen and Chint, while exported to South America, Southeast Asia, the Middle East and other overseas regions with quality validated through long-term market operation.

Quality control of electrical pressboard commences at the raw material stage. All incoming raw paper undergoes pre-testing for density, thickness and breakdown voltage with unqualified batches rejected outright. During production, hourly sampling inspects thickness and surface appearance to guarantee uniform thickness and smooth defect-free surfaces across full batches. Before finished product delivery, comprehensive testing covers five core indicators: density, tensile strength, compression strength, breakdown voltage and water absorption rate, with products only released upon passing all tests. Our dedicated testing laboratory is equipped with tensile strength testers, breakdown voltage testers and electrothermal blast drying ovens, with all test data filed for traceability and customer access to batch-specific test reports upon request. The company holds ISO9001 certification, and production strictly complies with national standards.

Extensive customization services are available for electrical pressboard. Thickness ranges from 0.5mm to 5mm with custom special thicknesses supported upon request. Size specifications span a maximum width of 1600mm with unlimited customizable lengths for slitting into custom sheets or full rolls. Our most valuable processing service enables stamping of finished parts per your drawings including blocks, support strips, angle rings and special-shaped components for direct assembly upon receipt, eliminating customer secondary cutting labor and material losses. OEM services are fully supported with packaging formats and labels customized to your brand requirements. The minimum order quantity is 500 kg, with separate quotations for formed parts based on complexity and free samples available for confirmation testing.

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