DMD Insulation Paper (Polyester Film Composite)
DMD insulation paper is a composite electrical insulation material made from polyester film laminated between two layers of nonwoven polyester fabric. This multi-layer structure provides a balance of electrical strength, flexibility, and mechanical durability required in transformer and motor insulation systems.
ACC Insulations manufactures high-quality DMD insulation materials for OEMs in transformer manufacturing, motor winding, switchgear assembly, and electrical equipment production.
What is DMD Insulation Paper?
DMD (Dacron-Mylar-Dacron) insulation is a three-layer flexible laminate where polyester film acts as the dielectric core and nonwoven fabric provides mechanical reinforcement. It is widely used in electrical insulation systems due to its high dielectric strength, thermal endurance, and compatibility with varnish impregnation processes.
Key Features
- High dielectric strength for electrical insulation
- Excellent thermal stability (Class B & Class F)
- Good flexibility for winding applications
- High tear and puncture resistance
- Compatible with varnish impregnation
- Low moisture absorption
Technical Specifications
| Material | Polyester Film + Nonwoven Fabric |
|---|---|
| Thermal Class | 130°C (Class B) / 155°C (Class F) |
| Thickness Range | 0.13 mm to 0.50 mm |
| Dielectric Strength | High |
| Color | White |
Applications
- Transformer winding insulation
- Motor slot insulation
- Electrical coil insulation
- Generator insulation systems
- Layer and phase insulation
- Electrical panel components
Types of DMD Insulation
- Class B DMD
- Class F DMD
- Prepreg DMD
- Roll and sheet form
Why Choose ACC Insulations?
- Consistent lamination quality
- Custom thickness and roll sizes
- Reliable supply for OEMs
- Strict quality control
- Technical application support
Engineering Tools Suite
Determine if Class B or Class F thermal endurance is required for your DMD application using our smart insulation selection calculators.
Frequently Asked Questions
DMD insulation paper is a composite material made of polyester film laminated with nonwoven polyester fabric on both sides. It is widely used for electrical insulation in transformers, motors, and coils due to its excellent dielectric strength and flexibility.
Class B DMD has a thermal resistance of up to 130°C, while Class F DMD can withstand temperatures up to 155°C. Class F is preferred for higher temperature electrical applications.
Yes, DMD insulation is widely used in transformer winding insulation, layer insulation, and phase insulation due to its high dielectric strength and durability.
DMD insulation offers excellent flexibility, making it ideal for motor slot insulation, coil wrapping, and other winding applications.
