Diamond Dotted Electrical Polyester Film(DDP Film)

Diamond Dotted Electrical Polyester Film(DDP Film)

Diamond Dotted Polyester Electrical Insulation Film, commonly referred to as DPF or DDM, is an insulating material engineered for high-performance electrical applications. It is manufactured by precision-coating a modified, high-grade epoxy resin in a uniform diamond-dot pattern onto a durable electrical polyester (PET) film substrate. 

As a professional electrical insulation material supplier, we manufactured our products in strict accordance with IEC and international standards.

Grid Side Length: 9.4 mm

Grid Spacing: 6.5 mm

Key Features & Benefits

Why choose our diamond dotted PET film for your electrical insulation projects?

• Reliable Bond Strength: The B-stage epoxy resin dots melt during the baking process, permanently bonding the adjacent winding layers into a rigid unit to resist short-circuit electromagnetic forces.

• Optimized Oil/Air Passages: Unlike fully coated films, the diamond pattern leaves sufficient space. This allows transformer oil or air to flow freely, accelerating heat dissipation and preventing hot spots.

• Excellent Dielectric Performance: The premium polyester base film ensures high breakdown voltage and low dielectric loss, maintaining safety under high-voltage stress.

• Mechanical Resilience: High tensile and tear strength prevents the film from puncturing or tearing during high-speed automated coil winding processes.

Applications of Diamond Dotted Film

Our diamond dotted electrical polyester film is widely utilized across various heavy-duty and precision electrical industries:

1. Transformer Manufacturing

Oil-Immersed Transformers: Ideal for layer insulation in distribution and power transformer coils, facilitating oil circulation.

Dry-Type Transformers: Provides exceptional structural support and phase insulation.

2. Electric Motor & Generator Winding

Slot Insulation: Protects copper wire windings from the stator core slots.

Phase & Interlayer Insulation: Ensures reliable separation between different electrical phases in Class B motors.

3. Other Electrical Apparatus

Capacitor insulation shielding, reactor coil layer insulation, and automotive electrical components.

Frequently Asked Questions (FAQ)

Q: What is the curing mechanism of the diamond dotted film?

A: The epoxy resin dots on the film are in a semi-cured "B-stage." When your wound coils undergo the baking process, these dots liquefy, bond with the surrounding wire, and then fully cure into an irreversible "C-stage" solid matrix.

Q: Can you customize the base film thickness and width?

A: Yes, we offer professional custom slitting insulation services. We can provide widths ranging from 10mm up to 1000mm, with custom master rolls and slit tape sizes based on your automated winding machine specifications.

Q: How should DDP polyester film be stored?

A: Because the epoxy resin is heat-sensitive, it should be stored in a cool, dry warehouse below 25℃, away from direct sunlight and heat sources. The recommended shelf life under these conditions is 12 months.