Flexible printed circuits replace cables and connectors with a thin polyimide substrate that folds, twists and vibrates for years without fatigue. They are the default answer wherever weight, thickness or moving parts matter: wearables, cameras, medical sensors, automotive displays and battery packs.
Xianglong Circuit manufactures single-sided, double-sided and multi-layer flex (up to 6 layers) on 12.5-50 um polyimide, with 3 mil minimum line and space, coverlay or flexible solder mask openings, and ENIG finish. Stiffeners in FR-4, polyimide or stainless steel are bonded locally where connectors need support, and boards can be supplied routed, scored or in panelized arrays for SMT.
Every flex order is engineered around its bend life: static applications are rated by standard IPC curves, while dynamic-bend designs get a dedicated stackup review so copper sits neutral-axis and survives millions of cycles. ISO 9001 and UL certified, exporting to Europe and North America since 2008.
Upload Gerber plus the bend and thickness targets - our FPC engineers return a DFM report with bend-radius verification and a quote within 24 hours.
| Layer count | 1 - 6 layers |
| Base material | Polyimide 12.5 / 25 / 50 um |
| Min line / space | 3 mil / 3 mil (75 um) |
| Copper | ED or RA (rolled annealed) 9-70 um |
| Coverlay | PI coverlay or flexible solder mask |
| Stiffeners | FR-4, PI, stainless steel |
| Surface finish | ENIG, OSP |
| Bend capability | static per IPC-2223; dynamic-bend stackup review |
Single-sided flex suits simple one-bend connections; double-sided adds routing density with through-holes; multilayer flex (3-6 layers) is for high-density modules where shielded or paired routing must cross. Tell us the bend life and routing count and we will recommend the cheapest structure that survives.
For static bends IPC-2223 recommends 6x to 12x the flex thickness depending on layer count; dynamic bends typically need 100x thickness and rolled-annealed copper with neutral-axis stackup. We verify both in DFM before production.
Yes. We run SMT on flex and rigid-flex panels with dedicated carriers, and supply stiffeners already bonded so the assembly lands flat. Turnkey component sourcing is available.
Prototypes start from 5 pieces with no tooling charge on repeat orders; mass production scales to reel-based SMT volumes.
