PCB Technical - FPC flexible circuit board testing methods and standards

FPC flexible circuit board testing methods and standards
The test scope includes flexible circuit single-sided, double-sided and multilayer boards. The flexible circuit board mentioned in this standard refers to single, double and multi-layer flexible copper foil substrates with polyimide (PI) or polyester (PET) as the base material, including adhesive and non-adhesive type Flexible copper foil substrate. The purpose of the test is to establish a general rule for judging the appearance quality of flexible circuit boards. As a basis for judging the appearance quality of flexible circuit boards between Tianpai company and suppliers, it will help to improve manufacturing technology and reduce unnecessary scrapping. Waste of resources and environmental pollution. Test method The test method uses visual inspection, magnifying glass, and ruler as the main inspection methods and tools. If necessary, other applicable test instruments or equipment may be used for inspection.
Basic testing standards:
1. The appearance of the substrate film surface;
2. Appearance of cover layer
3. Deviation of connecting plate and covering layer;
4. The seepage of adhesive and cover coating;

5. The conductor under the covering layer changes color. After 96 hours of humidity resistance test at a temperature of 40°C, a humidity of 90%, it must still meet the requirements of voltage resistance, bending resistance, bending resistance, and welding resistance;
6. Missing coating of the coating layer;
7. Poor electroplating combination.

Matters needing attention: Flexible circuit board (hereinafter referred to as: FPC) shelf life description:
The conductor part of FPC needs to be treated with surface plating (anti-rust), such as plating, gold plating, OSP, tin plating, etc. The storage environment should avoid corrosive gases, and the temperature should be controlled at 20+/-5 degrees Celsius, and the relative humidity should be controlled within the range of 70% R.H. Under the above storage conditions, the effective shelf life of the product is 6 months after leaving the factory.
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