Calculating the bending ratio for flex PCBs is an important step in ensuring their mechanical reliability. The bending ratio is determined by the relationship between the minimum bend radius and the thickness of the flexible material. Here is a guide to help you calculate the bending ratio:

1. Determine the minimum bend radius (R):

Refer to the specifications provided by the PCB manufacturer or consult their guidelines.

The minimum bend radius is the smallest radius that the flex PCB can safely withstand without causing damage or affecting its performance.

2. Measure the thickness of the flexible material (t):

Use a caliper or thickness gauge to measure the thickness of the flex PCB material.

Ensure accurate measurements by taking multiple readings and averaging them.

3. Calculate the bending ratio (BR):

Divide the minimum bend radius (R) by the thickness of the flexible material (t).

BR = R / t

4. Evaluate the bending ratio:

Compare the calculated bending ratio (BR) with the manufacturer's recommended bending ratio or industry standards.

If the calculated BR is within the acceptable range, the flex PCB should be able to bend safely without risking damage.

If the calculated BR is too large, it indicates that the flex PCB may be prone to mechanical stress or failure during bending.

Remember, it's crucial to follow the manufacturer's guidelines and specifications for bending and handling flex PCBs to ensure their reliability and longevity.

If you need any support to calculate bending ratio, please feel free to contact us at sales@hrxfpc.com