Halogen-free and glue-free double-sided substrate is a high-performance core material for circuit boards. Due to its dual advantages of environmental friendliness (halogen-free) and high performance (glue-free), it is typically not used in ordinary, inexpensive electronic products but rather in applications requiring higher performance or reliability.

In the world of printed circuit board (PCB) manufacturing, coverlams play a crucial role as a "protective outer layer." Halogen-free yellow coverlams are key materials designed to meet environmental, safety, and high-performance requirements. Combining protection, insulation, marking, and eco-friendly safety, they are indispensable in modern electronic products, particularly in consumer electronics and demanding applications. Halogen-free yellow coverlams serve as a protective film on circuit boards, with the following primary functions:

Blacked rolled single-sided adhesive substrate is a special material used for manufacturing flexible circuit boards (FPC) and rigid flex PCBs. To understand its advantages, we can analyze it one by one from its three key features - "blackening", "rolling", and "single-sided adhesive".

The function of the covering film, commonly known as coverlay, is to protect the flexible circuit board from the erosion of dust, moisture and chemicals and to reduce the influence of stress in the bending process, mainly playing an insulating role.