Semi-Flex Printed Circuit Boards

What are semi-flex PCBs?

Semi-flex printed circuit boards are manufactured using a process which mills a section of a rigid FR4 board down to a thickness of 0.20mm +/- 0.10mm.  This enables the board to be bent to fit inside a casing such as that used in automotive and data communications applications. 

Semi-flex PCBs are usually used for a one-time bend installation, and multi-bend flex boards are available for those applications which require multiple bends over their lifetime.

Features of semi-flex PCBs

Gloved hands inspecting a semi flex printed circuit board

Our Chinese and Thai manufacturing facilities combined with ISO 9001 accreditation means that we can ship high quality semi-flex PCBs anywhere in the world quickly and cost effectively, enabling you to get the product you want at a price that won’t blow your budget.

Speak to our friendly UK-based team to discuss your requirements today.

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Semi-Flex PCB technical specification

Layers1 - 12, with 1 – 2 conductive layers in the flexible section
Technology featuresThe process uses controlled depth routing of the FR-4 to achieve a flexible / bending section within a traditionally rigid FR-4 board. This is only suitable for static operations as the bends are typically just for installation.
Bend performanceSingle Bend - Flex to Fit 0° – 90°
Bend featuresMaximum bending angle of 90° with a 5mm radius
MaterialsSpecialised FR-4 for static flex applications
Copper weight (finished)35μm
Minimum track and gapTrack : 0.075mm, Gap : 0.075mm
PCB thickness in rigid section1.00mm – 2.00mm
PCB thickness in flex section0.20mm ± 0.10mm
Maximum dimensions550mm x 400mm
Surface finishes availableLead Free HAL, ENIG, Immersion Silver, Immersion Tin, ENIPIG, OSP & Hard Gold
Minimum mechanical drill8 mil (0.2mm) mechanical drill, 4 mil (0.1mm) laser drill