4 Layer Flexible PCB Production Record #FPC-20260526-023
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| PCB Type | Flexible PCB | Quantity | 5 pcs |
| Layers | 4 Layers | Board Type | Single PCB |
| Dimensions | 50 x 75 mm | Copper Weight | 1/2OZ |
| Thickness | 0.25 mm | Min Track / Spacing | 6/6mil↑ |
| Surface Finish | ENIG (Immersion Gold) | Min Hole Size | 0.3mm↑ |
| Solder Mask | Black | Silkscreen | White |
| Material | Rolled Copper | Stiffener | Steel Sheet Stiffener |
This small-quantity run consisted of five 4-layer flexible PCBs, each measuring 50 x 75 mm and built to a total thickness of just 0.25 mm using rolled copper of 1/2 oz per layer. The manufacturing process emphasized proper polyimide material handling, accurate circuit imaging and etching, followed by precise layer alignment and high pressure lamination. These steps were critical to achieving the required flexibility while preserving interlayer registration on such thin material.
Subsequent processes included coverlay lamination, black solder mask application with white legend, and selective attachment of steel sheet stiffeners for mechanical reinforcement. The immersion gold ENIG surface finish provided excellent solderability and long-term reliability on the exposed pads. We conducted dynamic flex testing to simulate real-world bending cycles, complemented by thorough electrical testing to verify all connections met the 6/6 mil design rules and 0.3 mm minimum hole diameter.
Completed over a 19.5-day production window, the boards exhibited consistent quality with no deviations in the flexible construction, ensuring dependable performance for the intended application.
Four layer flex circuits enable higher routing density and signal performance in compact, dynamic applications across medical, aerospace, and industrial sectors.
Learn about flexible PCB manufacturing equipment designed for handling thin, bendable substrates. Gain insights into laser cutting, adhesive bonding, and testing methods to ensure precision and reliability in production.
| Order ID | PCB Type | Layers | Dimensions | Solder Mask | Surface Finish | Quantity | Action |
|---|---|---|---|---|---|---|---|
| FPC-20260707-032 | Flexible PCB | 4 | 157.2 x 38.6 | Yellow | ENIG (Immersion Gold) | 125 | View detail |
| FPC-20260516-007 | Flexible PCB | 3 | 76.2 x 457.2 | Yellow | ENIG (Immersion Gold) | 5 | View detail |
| FPC-20260509-056 | Flexible PCB | 4 | 86 x 46 | Yellow | ENIG (Immersion Gold) | 50 | View detail |
