Introduction to CCL

CCL is primarily divided into three categories.

The first is high-frequency, the second is high-speed, and the third is standard.
There are three main standards to distinguish this categories:

1. Df (Dielectric Loss): The loss of electrical signals within the material.
2. Dk (Dielectric Constant): The delay of electrical signals within the material.
3. Tg (Glass Transition Temperature): The heat resistance of CCL.

Basic standards are as follows:

• Df < 0.005 is high-frequency.
• Df between 0.005 and 0.01 is high-speed.
• Df > 0.01 is Standard.

The higher the grade of the CCL, the lower the values of Df and Dk, resulting in less signal loss and delay. This means the technical requirements and the added value will be higher, naturally leading to higher profit margins and unit prices. If we want to divide it further, there are a total of six categories. Among them, automotive use is related to safety, so it will be classified as high-frequency CCL with 5G, high-speed CCL is used in servers and switches, and standard CCL is generally used in consumer
electronics.



Major Advantages of High-Frequency CCL

1. High efficiency
2. Fast speed
3. Good control
4. Strong durability

In the manufacturing process, resin, catalyst, and curing agent are first mixed, then applied to fiberglass cloth. This is bonded with PP and covered with copper foil to form the so-called copper-clad laminate.

In terms of cost proportion, CCL as a whole accounts for about 67% of the overall proportion of PCB, and the cost proportion is relatively high.