UGPCB High-Performance FPC – 1 to 12 Layers Custom Soft Board

FPC (Flexible Printed Circuit Board) is changing modern electronics design. According to BCC Research, the global FPC market will grow from $23.3 bi ll i o nin 2025 t o$ 41.7 billion by 2030. That is a CAGR of 12.3%. Research and Markets data shows the 2025 market at $28.36 bi ll i o n, r i s in g t o$ 31.07 billion in 2026 (CAGR 9.5%). Three main drivers fuel this growth: lightweight consumer electronics, EV adoption, and 5G infrastructure. High-performance FPC is now the fastest-growing segment in the PCB industry.

UGPCB High-Performance FPC Flexible Circuit Board

UGPCB is a professional PCB/PCBA manufacturer. We offer one-stop custom FPC services from design to mass production. This page covers our FPC product specifications, technical parameters, classification standards, and key advantages. You will find the best soft board solution for your project.

What Is an FPC Flexible Circuit Board? – Product Overview

FPC stands for Flexible Printed Circuit Board. It is also called a flex board or flexible circuit. The insulation base material is polyimide (PI) or polyester (PET). A precise etching process forms conductive traces on this thin flexible substrate. Unlike a rigid PCB, an FPC can bend, fold, and twist in 3D space. This flexibility perfectly supports modern trends toward smaller, lighter, and more integrated electronics.

IPC-6013E-2021 defines flexible printed boards as single-sided, double-sided, multilayer, or rigid-flex multilayer structures. These may include stiffeners, plated through holes (PTH), and blind/buried vias. UGPCB strictly follows IPC-2221 design standards and IPC-6013 performance specifications. Every FPC we produce meets international industry requirements.

UGPCB FPC Technical Parameters at a Glance

Parameter	UGPCB FPC Range	Notes / Reference
Layer count	1 – 12 layers	Multilayer FPC holds 39.4% global share (BCC Research, 2026)
Base material	PI (Polyimide), PET (Polyester)	High-temp PI is top choice for high-end FPC
Finished thickness	0.1mm – 0.8mm	Ultra-thin design suits wearables
Copper thickness	1/3 oz – 1 oz (≈12µm – 35µm)	Single-sided: 18µm/35µm; Double-sided: 12µm/18µm/35µm
Solder mask color	Yellow / Green / White	Yellow for general; black for high-end/anti-glare; white for reflective needs
Surface finish	ENIG / OSP	ENIG for fine pitch & Al wire bonding; OSP for lead-free soldering
Min trace/space	2mil/2mil (≈0.05mm/0.05mm)	Extreme capability; 3/3mil recommended for lower cost
Min hole diameter	0.1mm (≈4mil)	Supports HDI designs

Product Classification Based on IPC-6013

IPC-6013 defines three classification dimensions.

By Type (Layer & Structure)

Type	Definition	UGPCB Support
Type 1: Single-sided FPC	One conductive layer, with or without stiffener	✓
Type 2: Double-sided FPC	Two conductive layers with PTH, with or without stiffener	✓
Type 3: Multilayer FPC	Three or more conductive layers with PTH, with or without stiffener	✓ (up to 12 layers)
Type 4: Rigid-flex	Combination of rigid and flexible layers, three or more conductive layers with PTH	✓
Type 5: Flex/rigid-flex without PTH	Two or more conductive layers, no PTH	✓

By Performance Class (Use Scenario) – IPC-6011 & IPC-6013

Class 1 – General electronic products. Minimum reliability requirement for consumer electronics. Least strict testing.
Class 2 – Dedicated service electronics. Higher performance for communication and industrial control equipment.
Class 3 – High-performance electronics. Strict reliability for medical, aerospace, and military applications.

By Flexing Condition (Installation & Use)

Use A – Withstands single bending during installation.
Use B – Withstands specified repeated flex cycles.
Use C – Suitable for high-temperature environments above 105°C (221°F).
Use D – UL certified (meets UL 94 and UL 796F).

Classification of Two Main FPC Types Based on Product Structure

Applications of FPC Flexible Circuit Boards

FPC’s thin and flexible nature enables wide use in:

Consumer electronics – Smartphones (display, camera, battery connections), tablets, laptops, smartwatches, TWS earbuds, drones.
Automotive electronics – In-vehicle displays, camera modules, sensors, battery management systems (BMS), ADAS, LED lights.
Medical devices – Portable monitors, hearing aids, endoscopes, wearable health trackers, implantable devices.
Industrial control – Robot joints, precision instruments, internal wiring harnesses, IoT terminals.
Aerospace & defense – Lightweight interconnects for satellites, missiles, radar systems.
5G telecom – Base station antennas, RF front-end modules, high-speed signal lines.

BCC Research notes that multilayer FPCs hold 39.4% of the global market. This share keeps growing because smartphones, wearables, automotive electronics, and medical devices demand higher circuit density.

FPC Base Materials and Performance Features

Primary Base Materials

PI (Polyimide) – Excellent high-temperature resistance (-40°C to +125°C) and dimensional stability. Top choice for high-end FPC.
PET (Polyester) – Lower cost. Suitable for consumer applications without extreme temperature requirements.

Top industry suppliers use adhesiveless materials from Panasonic and DuPont, plus adhesive-based materials and coverlays from Sunky.

Key Performance Features

Feature	UGPCB FPC Advantage
Flexibility	Supports Use A (single bend) and Use B (repeated flex). Bending radius ≥1.2× board thickness gives over 300,000 flex cycles.
Thin & light	Finished thickness as low as 0.1mm – saves internal device space.
Temperature resistance	PI-based FPC works from -40°C to +125°C.
Flex life	Optimized design and material choice achieve 300,000+ repeated bends.
High-density interconnect	1.5mil/1.5mil trace/space and 0.1mm min hole meet high integration needs.

Design Guidelines and Working Principle

How an FPC Works

An FPC works like a rigid PCB: copper traces on an insulating substrate provide electrical connections between components. The difference is the flexible substrate (PI/PET). This allows the board to bend in 3D space, enabling complex and compact interconnects inside tight product enclosures.

Key Design Points per IPC-2221

Conductor spacing & clearance – Determine minimum safe distance based on working voltage. For 1kV DC/AC peak, pollution degree 2, uncoated environment, IPC-2221 recommends clearance ≥2.0mm.
Minimum trace/space – UGPCB supports 1.5mil/1.5mil. We suggest 3/3mil or above to lower manufacturing difficulty and cost.
Via design – Outer diameter should be at least 0.2mm larger than inner diameter (≥0.25mm recommended). A practical balance: 0.3mm inner, 0.55mm outer.
Impedance control – For high-frequency signals, we offer controlled impedance within ±10% tolerance.
Stiffener design – Add stiffeners at component mounting areas or ZIF connector interfaces. Common materials: PI, FR4, steel.
Bending area design – Avoid vias and pads in repeated bend zones. Route traces at 90° or with arcs. Place the bend centerline on copper-free areas to maximize flex life.

Production Flow Overview

UGPCB follows IPC-6013 performance specifications through these key steps:

Material cutting – Cut PI/PET base material to size.
Drilling – Mechanical or laser drilling. Minimum hole diameter 0.1mm.
Electroless copper / plating – Deposit conductive copper on hole walls to form PTH.
Circuit patterning – Laminate dry film → expose → develop → etch → strip film to create fine circuits.
Coverlay lamination – Apply coverlay as solder mask protection.
Stiffener attachment – Bond PI, FR4, or steel stiffeners on reinforced areas.
Surface finish – ENIG (Electroless Nickel Immersion Gold) or OSP.
Outer contour – Die punching or laser cutting.
Electrical test – Continuity and impedance tests (deviation ≤ ±8%).
FQC & packaging – AOI, dimensional inspection, and final packing.

Why Choose UGPCB for FPC Flexible Circuit Boards?

1. Full specification custom solutions – Support 1 to 24 layers, PI/PET base materials, multiple surface finishes, and solder mask colors. Meets your unique design needs.

2. Industry-leading precision – 1.5mil/1.5mil trace/space, 0.1mm min hole diameter, and 0.1mm finished thickness. Enables high-density interconnect designs.

3. Strict IPC compliance – All FPC products follow IPC-2221 design standards and IPC-6013 performance specifications. Quality guaranteed.

4. One-stop PCBA assembly service – UGPCB not only manufactures high-quality bare FPCs but also provides complete PCBA assembly. We handle component sourcing, SMT placement, and finished product testing. This streamlines your supply chain from PCB to PCBA, saving communication costs and shortening time to market. Contact our technical sales engineers for more PCBA service details.

5. Fast response and flexible support – Whether you need prototyping or mass production, we put your needs first. Expect professional, efficient, and reliable custom FPC service.

How to Get a Quote?

UGPCB aims to be your trusted FPC partner. To request a quote or technical consultation, please contact us with:

Your design files – Gerber files, design specification, or BOM list.
Key parameters – Layer count, base material type, finished thickness, copper weight, surface finish, min trace/space, min hole diameter.
Quantity and lead time – Sample quantity, mass production volume, and expected delivery date.

Our technical engineers will provide a professional DFM analysis and accurate quote within 24 hours.

👉 Request a quote today and start your custom FPC journey!

Data References

Key data in this document comes from:

✅ IPC-6013E-2021 – Qualification and Performance Specification for Flexible and Rigid-Flex Printed Boards
✅ IPC-2221 – Generic Standard on Printed Board Design
✅ BCC Research (2026) – Global Flexible PCB Market Report
✅ Research and Markets (2026) – Flexible Printed Circuit Board Market Report
✅ Industry standard FPC technical specifications (based on JLCPCB FPC parameters)

Contact us for fast FPC quotes and professional support.

Rigid-Flex PCB/

UGPCB High-Performance FPC Flexible Circuit Board – 1 to 12 Layer Custom Soft Board for All Your High-Density Interconnect Needs

What Is an FPC Flexible Circuit Board? – Product Overview

UGPCB FPC Technical Parameters at a Glance