Test method The main inspection methods and tools are visual inspection, magnifying glass and ruler. If necessary, other applicable test instruments or equipment can be used for inspection

​ 1. Appearance of substrate film surface; 2. Appearance of covering layer; 3. Deviation between connecting disc and covering layer; 4. Flow infiltration of adhesive and covering coating; 5. Discoloration of the conductor under the covering layer must still meet the requirements of voltage resistance, bending resistance, bending resistance and welding resistance after the humidity resistance test of 40 ℃, 90% and 96 hours; 6. Missing coating of coating layer; 7. Poor electroplating combination

Description of shelf life of flexible circuit board (hereinafter referred to as FPC): FPC conductor shall be coated (rustproof), such as plating, gold melting, OSP, tin plating, etc. The storage environment shall avoid corrosive gas, and the temperature shall be controlled at 20/- 5 ℃, and the relative humidity shall be controlled below 70% R.H. Under the above storage conditions, the effective storage period of the product is 6 months after delivery. The above is about the "Test Methods and Standards for FPC Soft Board" compiled above, which I hope will be helpful to you. If there is still something unclear, please contact our customer service to answer it for you.