Diamond Dotted Paper (Electrical Grade)
Diamond dotted paper (DDP) is a specialized electrical insulation material widely used in transformer insulation systems known for its superior bonding strength and dielectric performance, it plays a critical role in modern transformer insulation systems. ACC Insulations manufactures premium diamond dotted paper designed to meet the stringent requirements of transformer manufacturers.
What Is Diamond Dotted Paper?
Diamond Dotted Paper (DDP) is a high-performance electrical insulation material used in power and distribution transformers for winding insulation and layer bonding. Manufactured using electrical grade kraft paper coated with B-stage epoxy resin in a diamond pattern, DDP provides superior dielectric strength, thermal stability, oil compatibility and mechanical reinforcement in transformer insulation systems.
| Description | |
|---|---|
| Usage/Application | Transformer |
| Class | Diamond Dotted Paper with diamond-shaped epoxy resin dotted |
| Thickness | In mm, 0.12+-0.007, or 0.17+-0.01 |
| Colour | Brown Diamond Shape |
Features
- Electrical insulation
- Enhanced mechanical strength
- Improved drying process
- Reduced partial discharge risk
- Facilitates oil impregnation
Key Characteristics
- Excellent dielectric strength
- Strong bonding capability
- High thermal resistance
- Oil compatibility
- Mechanical stability
Applications
Diamond dotted paper is commonly used for:
- Transformer winding insulation
- Layer bonding
- Coil insulation
- High-voltage transformer applications
Why Diamond Dotted Paper Is Important
DDP improves transformer performance by:
- Preventing winding movement
- Enhancing mechanical strength
- Improving thermal endurance
- Reducing insulation failure risk
Manufacturing Process
ACC Insulations uses advanced coating and curing processes to ensure:
- Uniform resin distribution
- Strong adhesive properties
- Consistent performance
Technical Specifications
- Base Paper: Electrical Grade Kraft Paper
- Resin Type: B-Stage Epoxy Resin
- Thermal Class: Class F / Class H (based on application)
- Thickness Range: 0.12 ± 0.007 mm / 0.17 ± 0.01 mm
- Bonding Temperature: As per transformer curing cycle
- Oil Compatibility: Suitable for oil-filled transformers
Quality Assurance
Each batch undergoes:
- Dielectric testing
- Bond strength testing
- Thermal endurance testing
Advantages of ACC Insulations DDP
- Reliable bonding
- Consistent coating
- Custom sizes
- High-quality raw materials
Industries Served
- Power transformer manufacturing
- Distribution transformers
- Electrical equipment manufacturers
Related Insulation Products
Why Choose ACC Insulations?
Diamond dotted paper is essential for modern transformer insulation systems. ACC Insulations offers high-performance DDP that enhances transformer reliability and service life.
Engineering Tools Suite
Calculate precise dielectric strength requirements, curing temperatures, and thermal flow margins for your Diamond Dotted Paper applications using our interactive tools.
Frequently Asked Questions
The spaces between the dots allow transformer oil to flow freely through the paper, ensuring complete impregnation and preventing trapped air pockets.
The epoxy resin melts and permanently cures during the standard transformer coil baking process, typically between 100°C and 130°C.
Once cured, it bonds the winding layers into a rigid, solid block. This drastically increases the mechanical stability and short-circuit strength of the transformer.
Yes. We supply DDP in standard master rolls and provide in-house precision slitting to deliver custom tape widths based on your exact specifications.
