Diamond Dot Insulating Paper (DDP)
Diamond Dot Insulating Paper (DDP) Wholesale

Diamond Dot Insulating Paper (DDP)

Product Introduction
Diamond Dot Paper (DDP) is an insulating material produced by applying a special modified epoxy resin in a diamond-shaped pattern onto electrical insulating paper, followed by B-stage curing.
Working Principle:

  • Heating & Melting: The diamond-shaped epoxy resin melts at a specific temperature during coil drying, becoming tacky.
  • Bonding & Curing: As temperature increases, the resin fully cures (C-stage), firmly bonding adjacent coil layers.
  • Gas Release: The dot-shaped resin pattern allows gases to escape through uncoated areas during curing.
  • Oil Impregnation: Transformer oil can fully penetrate the insulation through areas without coating.
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  • Description
  • Applications
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Performances
DDP offers high breakdown voltage and superior insulation. Its diamond-shaped epoxy coating cures under heat to deliver strong adhesion and excellent resistance to short-circuit forces. With a heat resistance of Class B to F (130-155°C), the dot pattern ensures smooth gas release to prevent corona and partial discharge, while still allowing transformer oil to fully penetrate. It integrates insulation, bonding, and breathability into a single material.

About
Zhejiang Yuanda Fiberglass Mesh Co.,ltd.
Zhejiang Yuanda Fiberglass Mesh Co.,ltd.
Zhejiang Yuanda Fiberglass Mesh Co., Ltd. is China Diamond Dot Insulating Paper (DDP) Manufacturers and Wholesale Diamond Dot Insulating Paper (DDP) Suppliers, was founded in 2000. It is a technology-oriented manufacturing enterprise focusing on the new materials field, specializing in the research and development, and production of composite reinforcing materials, insulating materials, and related intelligent equipment. Committed to providing professional and reliable products and services to customers worldwide. The company is located in the Yangtze River Delta Economic Circle of China, close to Ningbo Port and Shanghai Port. The unique geographical location has brought convenience to the company's import and export business. The company covers an area of nearly 33,000 square meters and has modern standard workshops.
The three core business segments
1. Composite material fiber bars and fiber bar mesh sheets (GFRP), as well as supporting production equipment.
2. Special interlayer insulating materials for power transformers and motors.
3. For the past 25 years, Zhejiang Yuanda Fiberglass Mesh Co., Ltd. has been deeply engaged in the field of new materials, deepening technological innovation and industrial collaboration, continuously expanding the application scope of its products, and has won wide recognition from customers. In the future, we will be committed to building a leading domestic supplier of composite new materials and injecting continuous impetus into the high-quality development of the industry.
Certificate Of Honor
  • Test Report
  • Test Report
  • Quality Management System Certificate
  • Quality Management System Certification Certificate
  • Safety Production Standardization
  • Business License
  • TEST REPORT
  • SGS
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