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Rigid-Flex PCB Manufacturer & Assembly | TopFast PCBA

What Are Rigid-Flex PCBs?

Hybrid circuit boards combining rigid and flexible sections for dynamic applications.

  • Maintains constant bend angles during installation
  • Enhanced durability in space-constrained environments
  • Ideal for complex multi-layer designs

Topfast specializes in high-quality rigid-flex PCBs, with engineering expertise to meet your specific application requirements.

Why Choose Rigid-Flex PCBs

Topfast delivers high-reliability rigid-flex solutions that maximize performance in compact designs.

Space Saving

60% smaller than traditional boards with wiring harnesses

Design Flexibility

Bend and fold to fit complex geometries

High Reliability

100,000+ flex cycles with no connection failures

Durability

Withstands extreme temperatures up to 300°C

Rigid-Flexible PCB Materials

Surface Treatment Options

  • HASL (Vertical or Horizontal)
  • Lead-Free HASL
  • OSP (Shikoku F2)
  • OSP (Entek)
  • ENIG (Electroless Nickel Immersion Gold)
  • Immersion Silver
  • Immersion White Tin
  • Tin-Nickel
  • Electrolytic Soft Gold
  • Electrolytic Hard Gold
  • Selective Gold

Technical Specifications

ParameterMetric ValueImperial Value
Min Core Thickness0.051 mm0.002″
Max Finished Copper Weight89 ml3 oz
Max Finished Copper Thickness0.009 mm
Smallest Mechanical Drill0.180 mm0.0071″
Smallest Laser Drill0.127 mm0.005″
Min Finished Hole Size0.152 mm0.006″
Max Through Hole Aspect Ratio10:1
Max Blind Via Aspect Ratio0.75:1
Min Trace/Space (Rigid)0.089 mm0.0035″
Min Pad Size for Test0.127 mm0.005″
Material TypeExample / SubtypeFunction
ConductorsRolled Annealed (RA) CopperUsed in flexible circuits requiring repeated bending. It offers superior ductility, a grain structure aligned with the bend axis, and a reduced risk of micro-cracking.
Electro-Deposited (ED) CopperPreferred in rigid sections and some static flex zones. Provides high conductivity and fine trace definition but lower flex fatigue performance than RA copper.
AdhesivesEpoxyStrong adhesion with low moisture absorption. Tg typically ≥135 °C. Commonly used between copper and dielectric layers in rigid zones.
AcrylicHigh peel strength, chemical resistance, and thermal stability (Tg ~150 to 200 °C). Often selected for rigid-flex bonding interfaces.
Pressure Sensitive Adhesive (PSA)Low-temperature bonding layer is used to attach stiffeners or mount flex circuits. Limited to non-electrically active zones.
Polyimide (as adhesive)Extreme thermal resistance (>250 °C) and chemical durability. Used in aerospace-grade flexible PCB assemblies exposed to harsh environments.
Adhesiveless Base MaterialPolyimide is cast directly onto copper foil.Eliminates adhesive interface, improves flexibility, reduces Z-axis expansion, and enhances thermal reliability in dynamic flex circuits.
Pre-preg (Resin-coated Glass)Dielectric bonding sheet used during multilayer lamination in rigid areas. Properties depend on the resin system (Tg, flow, Dk/Df).
Insulators / DielectricsFR-4Standard rigid PCB core. Tg typically 135 to 170 °C. It provides mechanical support and a routing platform for rigid flex boards.
PolyimideHigh-flex, high-temperature material (Tg >250 °C). Used in flexible sections due to superior bend endurance and dimensional stability.
CEM-1Cellulose-based composite alternative to FR-4. Used in cost-sensitive rigid sections with low mechanical stress.
Polyester (PET)Flexible and thermally stable (~120 to 150 °C), lower cost than polyimide. Used in basic flexible PCB assemblies.

FAQ

What certifications do your PCB factories have?

All of our products are IPC rated with ISO 14001, ISO 9001, CE, and ROHS certificates. Our products are widely used in communication, medical equipment, industrial control, power supply, consumer electronics, aerospace, and automotive industries.

How many layers can your rigid-flex boards do?

Rigid zone: 4-20 layers (up to 30 layers), Flexible zone: 1-8 layers. We can also do 6-12 layers of rigid-flex combination. Designs over 16 layers require additional yield assessment (every additional 5 layers decreases yield by 8-12%).

Can you copy boards and provide batch pricing?

We can copy boards but cannot evaluate batch quantities or pricing immediately. Final pricing depends on production process, component brands/models, and production quantity.

How does rigid-flex PCB quoting work?

Our pricing is transparent with no hidden fees. Quotes can be made in as little as 10 minutes, depending on board complexity.

Do you charge for shipping? How is it calculated?

We calculate shipping based on destination address/zip code and product weight. Customers can request shipping quotes before finalizing orders.

Applications of Rigid-Flexible PCB

Rigid-flex printed circuit boards (PCBs) are ideal for electronic components that require mechanical flexibility, compact dimensions, and long-term reliability. Their structure supports applications in a wide range of fields.

Consumer Electronics

Used in smartphones, wearables, and tablets for space-saving designs and improved durability.

Industrial Machinery

Withstands vibration and harsh environments in automation equipment and control systems.

Medical Equipment

Essential for compact, reliable devices like implants, monitors, and diagnostic tools.

Automotive Communications

Used in ADAS, infotainment systems, and vehicle networking components.

Contact us

Talk to Our PCB Expert

  • PCB Prototype
  • PCB Assembly