- Introduction to FPC White Film
White film refers to white solder mask, also known as white cover film, similar to white ink on a hard board, serving the purpose of solder mask insulation and circuit protection.
The material of the cover film is the same as the raw material of FPC, which is PI (polyimide), and it can also be flexed. Currently, there are two main processes for white FPC on the market: white film and white solder mask ink. White solder mask ink has a low cost, but due to its characteristics and process properties, it cannot be flexed or has poor flexing performance. On the other hand, white film has good flexing performance, high reflectivity, and higher pressure resistance characteristics.
The reflectivity of the white film can reach over 85%, and it has excellent flexing performance, with thicknesses of 40.5um and 68um, as follows:
- Differences Between White Film, Yellow Film, and Black Film and Their Suitable Applications?
1. Yellow Film: This material has a certain degree of transparency and features easy processing, low cost, and stable performance. It is suitable for most products, such as various types of ribbon cable products.
2. Black Film: It is less prone to discoloration, has a high-end appearance, does not reflect light, and offers better confidentiality for circuits. It is commonly used in high-end or light-absorbing products like automobiles, phones, LED displays, etc.
3. White Film: White film has an additional white coating layer, slightly thicker than yellow and black films. Due to the reflective properties of the white coating, laser shaping may be somewhat more challenging. It is often used in products that require reflection, such as lighting fixtures, LED displays, medical beauty products, etc.
Features of FPC White Film: Flexibility, high reflectivity, high-temperature resistance, uses a non-adhesive substrate, can be bonded with 3M adhesive, and can be used for SMT.
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