Polyimide PCB Manufacturer High-Temperature and Flexible Applications

A customer developing a compact electronic device needed a flexible circuit that could fit within a narrow housing while maintaining reliable electrical connections and meeting strict space constraints. A conventional rigid PCB could not accommodate the required routing path. PCBMASTER’s engineering team developed a single-sided polyimide flex PCB using a 25 μm polyimide base film and 18 μm copper foil, balancing circuit flexibility, conductor layout, and mechanical reliability.

To address the installation challenges, our engineers optimized the circuit outline, routing paths, and connector interfaces according to the available internal space. Localized stiffeners reinforced connector areas, improving mechanical support during assembly and repeated mating. By combining material selection with detailed layout optimization, PCBMASTER delivered a compact flexible circuit solution that followed the device’s internal geometry, reduced interconnection constraints, and supported a thinner, lighter product design.

While developing an electronic control module rated for 150°C, our client needed a flexible interconnection solution that retains stable electrical performance and structural integrity under intense heat. The PCBMASTER engineering team evaluated polyimide substrate options, copper thickness and stack-up configuration to match fine-pitch routing requirements, delivering a custom FPC solution that meets both thermal and electrical specs.

This design features a 0.20mm overall thickness with 35μm copper for conductive layers. Beyond high-temperature PI material selection, our engineers took reflow temperature, dimensional stability under heat, copper distribution and long-term thermal aging into account. This integrated engineering methodology balances material properties and flexible circuit structure, helping our client realize high-temperature electronics without compromising fine circuit layout or electrical function.

As a customer’s electronic product evolved toward a smaller form factor, a double-sided flexible PCB no longer provided sufficient routing capacity for the increasingly complex circuit connections. PCBMASTER developed a four-layer polyimide multilayer flex PCB featuring 18 μm copper foil and a target finished thickness of 0.25 mm, creating additional routing capacity within a compact footprint.

Our engineering team optimized the layer stack-up, via arrangement, and conductor routing to accommodate complex interconnections while preserving the flexibility required by the application. Special attention was given to copper distribution and via placement in areas exposed to bending, helping manage mechanical stress and maintain circuit integrity. By coordinating multilayer design, material selection, and fabrication considerations, PCBMASTER provided a high-density flexible circuit solution that supported more complex electrical connections without increasing the circuit outline.

When a customer needed to connect multiple rigid circuit sections within a compact electronic product, separate rigid PCBs and connecting cables complicated internal routing and assembly. PCBMASTER engineered a custom rigid-flex PCB with a four-layer copper structure, 1.0 mm rigid sections, and a 0.20 mm flexible section, integrating component-mounting areas and flexible interconnections into one coordinated circuit design.

Our engineers optimized the rigid and flexible regions, layer transitions, and routing paths to meet the product’s electrical and mechanical requirements. The rigid sections provided stable platforms for component mounting, while the polyimide-based flexible section routed signals through confined spaces without relying on multiple separate cable connections. This integrated approach simplified interconnection architecture, reduced dependence on additional connectors and cables, and supported a more compact assembly.