Polyurethane-180 combines the thermal properties of a class 180°C insulation, while offering low temperature solderability at 390°C (24 AWG and finer). Automotive relays, ignition coils, transformers and solenoids. Polyester-imide magnet wire is insulated with a Class H modified polyester resin.

Polyurethane-180 (PU-180) and Polyester-Imide (EIW) are both types of magnet wire insulation used in electrical applications. While they have similarities, there are also some key differences between them. Here's a comparison:

Insulation Material:
Polyurethane-180 (PU-180): PU-180 is a type of thermoplastic insulation material. It is based on polyurethane resin and is known for its excellent electrical properties, thermal stability, and good mechanical strength. PU-180 wires have a thermal class rating of 180°C, meaning they can withstand temperatures up to 180°C without significant degradation.

Polyester-Imide (EIW): Polyester-imide is a thermosetting insulation material. It is based on a combination of polyester and imide resins. EIW wires have higher temperature resistance compared to PU-180 wires, with a typical thermal class rating of 200°C or higher.

Thermal Class:
PU-180: PU-180 wires have a thermal class rating of 180°C. This makes them suitable for applications where moderate temperature resistance is required.

EIW: EIW wires have a higher thermal class rating, typically 200°C or higher. They are used in applications where higher temperature resistance is necessary, such as in high-power transformers, motors, and other devices operating at elevated temperatures.

Temperature Resistance:
PU-180: PU-180 wires can withstand temperatures up to their specified thermal class rating of 180°C. They offer good thermal stability and can handle moderate temperature environments.

EIW: EIW wires have higher temperature resistance and can withstand temperatures beyond 200°C without significant degradation. They are designed for applications where the operating temperature exceeds the capabilities of PU-180 wires.

Mechanical Strength:
PU-180: PU-180 wires offer good mechanical strength, allowing them to withstand bending, winding, and other mechanical stresses typically encountered in electrical applications.

EIW: EIW wires also exhibit good mechanical strength, enabling them to handle mechanical stresses and winding processes. However, due to their thermosetting nature, they may be slightly more rigid than PU-180 wires.

Applications:
PU-180: PU-180 wires are commonly used in a wide range of electrical applications, including motors, transformers, solenoids, and other devices that operate within their thermal class rating of 180°C.

EIW: EIW wires are typically employed in high-temperature applications, such as heavy-duty motors, high-power transformers, and other devices that require greater temperature resistance beyond the capabilities of PU-180 wires.

When selecting between PU-180 and EIW wires, it is important to consider the specific requirements of the application, including operating temperature, thermal class rating, mechanical stresses, and environmental conditions. Consulting the manufacturer's specifications and guidelines is recommended to ensure the appropriate choice for a given application.

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