3D MID (Mechatronic Integrated Device) is deep technology that forms electrical circuits directly on the surface of a molded component and enables electronic components to be mounted on three-dimensional structures.

In 3D MID development, circuit design and manufacturing processes are important. However, the selection of the molded material also has a significant impact on product performance, quality, and reliability.

There is no single material that is suitable for every 3D MID application. The appropriate material depends on the operating environment, required performance, product geometry, circuit formation method, and manufacturing conditions.

This article explains why material selection is important for 3D MID and introduces the key characteristics required for different applications.

Why is Material Selection Important for 3D MID?

For conventional molded parts, material selection is typically based on factors such as mechanical strength, heat resistance, and moldability.

In 3D MID, however, the molded component also serves as a circuit carrier.

Therefore, material selection must take into account not only mechanical properties and moldability, but also circuit formation, plating adhesion, dimensional stability, and long-term reliability.

For example, the following factors should be considered:

By comprehensively evaluating these factors, it is possible to select the most suitable molded material for each 3D MID application.

Representative Molded Materials Used for 3D MID

3D MID uses a variety of molded materials depending on the application and performance requirements.

The four representative material categories are:

LCP	Epoxy	SPS	PPSU
Excellent high-frequency performance Dimensional stability Suitable for fine patterning	Excellent processability Excellent adhesion Good balance of performance and cost	Low water absorption Suitable for high-frequency applications Excellent environmental stability	Chemical resistance Heat resistance Suitable for sterilization applications

The materials listed above are representative examples. Other molded materials can also be considered depending on product specifications and performance requirements.

Key Points to Consider Molded Material Selection

Considering these factors helps determine the most suitable molded material for each product and application.

Performance Requirements Vary by Application

The performance requirements for 3D MID vary significantly depending on the application.

For example:

Choosing Most Suitable Material to Your 3D MID Application

Selecting the right molded material is essential to achieving the required performance, reliability, and manufacturability of a 3D MID product.

The optimal material depends on multiple factors, including operating temperature, environmental conditions, product geometry, circuit requirements, and manufacturing processes.

At SENIN TECHNOLOGIES, we support material selection and process development based on the requirements of each application, from initial design and prototyping through mass production.