1. Core Technical Indicators and Compliance

Density and Grades: Confirm if the manufacturer can provide various grades of electrical insulation pressboards compliant with the IEC 60641 standard. This includes high-density (typically 1.0 – 1.3 g/cm³) and medium-to-low density pressboards to meet the needs of different voltage transformer classes.

Electrical and Chemical Properties: Manufacturers must provide complete third-party test reports (such as SGS). These reports should prove high purity, low moisture content, low dielectric dissipation factor (tanδ), and excellent thermal aging resistance.

2. Processing and Customization Capabilities (Value-Added Services)

3. Quality Certification and Production Standards

Quality Systems: Prioritize companies certified under ISO 9001, ISO 14001, and ISO 45001. This ensures consistency and stability across different production batches.

Industry Experience and Track Record: Review whether the manufacturer supplies well-known domestic and international transformer OEMs. For Ultra-High Voltage (UHV) or large-capacity power transformers, their historical supply record is highly critical.

4. Supply Chain and Service Guarantees

Lead Time and Packaging: Verify delivery cycles and ensure they offer moisture-proof, deformation-resistant vacuum packaging to protect the pressboard from humidity during long-distance transport.

Technical Support: Top-tier manufacturers should provide advice on insulation structure design and support sending free samples for prototyping and testing.

5.Manufacturer consoultation

ZTelec Group specializes in transformer pressboard solutions, providing customized insulating pressboard components based on user industry needs and transformer voltage levels. If you are looking for transformer pressboard, please contact us. We offer free technical solutions and product quotations.