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Diamond Dotted Paper (DDP)

Rolls of Diamond Dotted Paper (DDP) for transformer insulation

Premium Diamond Dotted Paper

Diamond Dotted Paper (DDP) is a crucial insulation material consisting of high-quality electrical kraft paper coated on one or both sides with a specialized, partially cured B-stage epoxy resin applied in a diamond-shaped pattern.

Supplied by Saasvat Urja Solutions, this material is engineered specifically for use in oil-immersed distribution and power transformers. During the transformer's drying and curing process, the epoxy resin melts and bonds the coil layers together, creating a solid, highly reliable structural block that prevents mechanical displacement.

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Technical Specifications

Standard Material Capabilities
Base MaterialElectrical Grade Kraft Paper
Resin TypeModified B-Stage Epoxy Resin
Thermal ClassClass A (105°C) to Class E (120°C)
Available Thickness0.08 mm to 0.50 mm (Custom thickness available)
Curing ConditionsTypically 130°C - 150°C (depending on coil mass)

Importance in Transformer Manufacturing

The operational integrity of a transformer heavily relies on its ability to withstand extreme electrical and mechanical stress, especially during short circuits. Ordinary kraft paper acts as a dielectric barrier, but Diamond Dotted Paper takes it a step further.

Because the resin is applied in a precise diamond pattern rather than a solid sheet, it allows for the complete removal of air and moisture during vacuum drying, and permits the free flow and complete impregnation of transformer oil, ensuring superior heat dissipation while maintaining rigid structural support.

Key Advantages & Features

Our DDP inventories are chosen to eliminate structural vulnerabilities in transformer coils:

  • High Short-Circuit Strength: Cured epoxy permanently bonds winding layers, preventing wire shifting under stress.
  • Excellent Oil Compatibility: Will not contaminate or degrade transformer insulating oil over the equipment's lifespan.
  • Optimal Dielectric Performance: High breakdown voltage ensures safe isolation between copper/aluminum layers.
  • Custom Slitting Available: We provide jumbo rolls or custom-slit widths tailored precisely to your winding machines.

Frequently Asked Questions

Because it contains partially cured B-stage resin, DDP should be stored in a cool, dry environment (typically below 25°C) away from direct sunlight. Under proper storage conditions, it generally maintains its bonding properties for 6 to 12 months.
We supply Diamond Dotted Paper with epoxy resin coated on either a single side or both sides, depending on your specific winding design and structural requirements.
Yes. Operating from our Nashik headquarters, we offer rapid slitting and dispatch services. We can supply rolls in various widths to transformer manufacturers nationwide to prevent any supply-chain bottlenecks.

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