DDP vs. Other Insulation Papers: A Comprehensive Comparison Guide

As an indispensable key material in electrical equipment, insulating paper shoulders the heavy responsibility of isolating conductive parts and preventing short circuits, which is of great significance to improving the electrical safety and reliability of equipment. Different types of insulating papers have their own advantages in temperature resistance, mechanical strength, dielectric properties and cost, so choosing the right insulating paper plays a vital role in the performance of equipment.

Among many insulating papers, DDP is a high-performance insulating material. With its unique resin lattice structure, it has excellent mechanical strength and wear resistance. This article will comprehensively compare DDP with common insulating papers such as Nomex®, kraft paper, polyester film (Mylar®) and aramid paper, and deeply analyze their performance characteristics, applicable scenarios and selection recommendations to help engineers and purchasers make more reasonable material choices.

1. Overview of DDP

DDP is a composite insulating material. It is made by coating a regularly arranged resin lattice (shaped like diamond dots) on a cellulose or synthetic fiber substrate. This unique structure gives it many advantages:

High mechanical strength: The presence of the resin lattice enhances DDP's tear and puncture resistance, making it adaptable to high mechanical stress environments.

Excellent wear resistance: The resin dots can reduce the loss caused by friction, thereby extending the service life of the insulation system.

Good electrical properties: It has a high dielectric strength of 15-25 kV/mm and is suitable for medium and high voltage equipment.

Stable temperature resistance: It can usually withstand temperatures of 130-180°C and can be used in F-H grade insulation systems.

Low moisture absorption: Compared with traditional kraft paper, DDP has a lower moisture absorption rate and can function normally in humid environments.

Typical applications of DDP:

High-voltage motor slot insulation

Transformer interlayer insulation

Generator stator insulation

Other electrical insulation occasions requiring high mechanical strength

2.Nomex paper

Applicable scenarios:

Aerospace: Aircraft power system, motor insulation (meet the needs of extreme temperature and lightweight).

Petrochemical: High temperature pump motor, explosion-proof transformer (need to meet H-level temperature resistance standard and have flame retardant properties).

Advantages:

High temperature resistance limit: Nomex paper can withstand high temperature above 220℃ for a short time, and is suitable for short-term overload scenarios.

Good flame retardancy: Nomex paper passed UL94 V-0 certification and has excellent safety.

3.Polyester film insulation paper

Applicable scenarios:

Household appliances: Air conditioning compressor, refrigerator motor (stable load, low temperature rise).

Lighting equipment: LED driver power supply, fluorescent lamp ballast (small size, cost priority).

Advantages:

Low cost: Its price is more than 50% lower than DDP, and it is suitable for large-scale consumer electronic products.

Excellent dielectric properties: Polyester film insulation paper is suitable for high-frequency, high-voltage and low-power scenarios, such as switching power supplies.

4. Kraft paper

Applicable scenarios:

Low voltage and short life products such as toy motors and small fans.

Disadvantages:

Easy to absorb moisture: After absorbing moisture, the insulation performance will decrease, and additional moisture-proof treatment is required.

Short life: The service life is usually no more than 3 years, and it is only suitable for one-time or low-frequency use.

In comprehensive comparison, DDP has significant advantages in mechanical strength, electrical performance and durability, and is an ideal choice for medium and high voltage electrical equipment. Although its initial cost is higher, it is often more economical from the perspective of the entire life cycle. For some special application scenarios, such as extreme high temperature environments, special materials such as Nomex® are still an indispensable choice. Therefore, when selecting an engineering model, the technical parameters, operating environment and economic benefits should be comprehensively weighed to select the most suitable insulation solution.