QFPCB factory specializes in providing turnkey service of customized PCB & PCBA solutions to meet the diverse needs of our clients. Our factory is committed to providing one-stop PCB & SMT assemble solutions to drive technological advancement and innovation.
Designed for the most demanding applications across automotive, aerospace, telecommunications, and industrial sectors, Pyralux® AP delivers unmatched thermal stability, mechanical strength, and process compatibility. As electronic systems push the boundaries of speed, density, and operating environment, Pyralux® AP provides the robust foundation needed to ensure long term reliability and superior performance.
In this article, we’ll discuss what really characterizes the Pyralux® AP Flexible laminate. The relevant information is available for pcb design engineers to refer to in the selection of materials, And you can also call QFPCB to discuss. QFPCB offers the best services when it comes to the multilayer flex and rigid flex circuit boards, so please feel free to contact us.
What is The Pyralux® AP Flexible Laminate?
DuPont™ Pyralux® AP double sided, copper clad laminate is an all polyimide composite of polyimide film bonded to copper foil. This material system is ideal for multilayer flex and rigid flex applications which require advanced material performance, temperature resistance, and high reliability. That have excellent dielectric thickness tolerance/electrical performance, full compatibility with PWB industry processes, IPC 4204/11 certified.
Double sided 1mil Pyralux® AP was developed for high reliability flexible circuit applications requiring thin dielectric profles and superior performance offered by its all polyimide construction. The high material modulus provides excellent handling characteristics in a thin adhesiveless laminate. The 2mil Pyralux® AP adhesiveless laminate is ideal for double sided, multilayer flex as well as rigid flex applications requiring advanced material performance and high reliability. All polyimide constructions enable designers fabricators, and assemblers to achieve higher density, premium performance flexible circuitry. And it is the first all polyimide flexible circuit material to be offered in dielectric core constructions of 3-6mils and greater. These clads provide designers and fabricators new options in building high reliability / high yield circuits for controlled impedance and high frequency applications.
Offered in a full range of dielectric thicknesses, it provide designers, fabricators, and assemblers a versatile option for a wide variety of flexible circuit constructions. Pyralux® AP copper clad handling and processing requirements are identical to standard 2 mil Pyralux AP clads. They are fully compatible with all conventional flexible circuit fabrication processes including oxide treatment and wet chemical plated through hole desmearing. Fabricated circuits can be cover coated and laminated together to form multilayers or bonded to heat sinks using polyimide, acrylic, or epoxy adhesives.
The Pyralux® AP Flexible Laminate Data Sheet
The Features of Pyralux® AP Flexible Laminate
Dielectric Constant (Dk)
With a dielectric constant (3.4 @1MHz), the Dielectric Constant (Dk) of Pyralux® AP laminate is a measure of its ability to store electrical energy in a capacitor like manner. The material maintains a stable dielectric constant, which is essential for high quality pcb boards.
Dissipation Factor (Df)
With a dissipation factor (0.003 @1MHz), it have a low Df, which minimizes energy losses as signals travel through the PCB. A lower Df translates to less signal loss, which is paramount for maintaining signal strength in high speed applications.
Low CTE for rigid flex multilayers
One of the most critical challenges in rigid flex circuit design is managing stress at the interface between rigid and flexible sections. Mismatched CTE values can lead to delamination, via cracking, and solder joint failure during thermal cycling. it feature a low CTE, closely matching that of copper and FR-4 rigid laminate. This minimizes thermal stress during manufacturing and operation, making Pyralux® AP ideal for multilayer rigid flex constructions used in high reliability environments such as aerospace and automotive control systems.
Excellent Thermal Resistance
The manufacturing of flexible circuits involves exposure to high temperatures, particularly during soldering. The polyimide and acrylic adhesive system in Pyralux® AP are formulated to withstand these rigors, offering excellent thermal resistance that prevents decomposition or degradation. More importantly, it demonstrates excellent long term thermal aging characteristics. This means that over the projected lifespan of a device, the material will not embrittle, crack, or significantly lose its mechanical and electrical properties, even when consistently operating at elevated temperatures.
Thin Cu-clads with superior handling
As electronic devices become thinner and more compact, the need for ultra thin, yet robust, copper clad laminates grows. Pyralux® AP offers thin copper clads (down to 1/2 oz or less) while maintaining excellent handling characteristics during fabrication. The combination of very thin copper foils plus the high modulus polyimide core means the substrate is more manageable in very thin construction, enabling fine flex circuits, while still providing enough rigidity for handling during fabrication and assembly.
Unique thick-core product for controlled impedance
Pyralux® AP also offers a “unique thick core product for controlled impedance” meaning the dielectric core thickness can be chosen to suit impedance controlled flex or rigid flex circuits (e.g., microstrip or stripline). The laminate includes a unique thick-core variant that enables precise impedance control in single and double sided flex circuits. This makes it suitable for applications requiring stable signal transmission, such as high frequency data links and sensor interfaces.
High Cu-polyimide adhesion strength
Adhesion between copper foil and dielectric substrate is a frequent failure point in flex/rigid flex circuits, especially when bending, thermal cycling, humidity exposure or chemical exposure is involved. It is specified with high copper polyimide adhesion strength (peel strength values >1.8 N/mm in many cases) and good retention after soldering.
UL 94V-0, UL 796, 180℃ (356°F) max. operating temperature
Safety is a non-negotiable requirement in all electronic systems. Pyralux® AP carries a UL 94 V-0 flammability rating, meaning it self extinguishes within 10 seconds after ignition and does not drip flaming particles. Additionally, it is recognized under UL 796, the Standard for Safety for Printed Wiring Boards, ensuring compliance with global fire safety regulations.
What are The Applications of Pyralux® AP Flexible Laminate?
The unique combination of thermal stability, mechanical durability, and electrical performance makes Pyralux® AP ideal for a wide range of high reliability applications across multiple industries.
Automotive
This laminate is found in engine control units (ECUs), transmission controls, anti lock braking systems (ABS), and advanced driver assistance systems (ADAS) like radar and LiDAR. Its ability to withstand under the hood temperature extremes, vibration, and exposure to fluids is essential.
Aerospace and Military
This is the native environment for Pyralux® AP. From flight control systems and avionics in commercial aircraft to guidance systems and communications in defense platforms, the material’s performance under thermal cycling, high humidity, and mechanical shock is unparalleled. Its high temperature rating and long term reliability align perfectly with the multi decade service life expected in these sectors.
Telecommunications Equipment
The infrastructure that powers our connected world base station antennas, network routers, and high speed data switches relies on stable signal integrity. The thick core Pyralux® AP products enable precise controlled impedance lines, while its low loss characteristics ensure signals are transmitted cleanly over a wide frequency range.
Computers and Consumer Products
While sometimes used in high end servers and workstations for its reliability, the laminate also finds its way into demanding consumer applications. Its use in rigid flex constructions allows for the thin, light, and dense circuitry required in high performance laptops, digital cameras, and other compact electronics where space is at a premium and reliability is a key selling point.
Industrial Instrumentation and Controls
Factory automation, process control systems, and industrial sensors operate in environments filled with heat, vibration, and corrosive chemicals. The durability and chemical resistance of Pyralux® AP make it a dependable choice for ensuring uninterrupted operation in these critical industrial settings.
Why Choose Pyralux® AP For Advanced Flexible Circuit Applications？
DuPont™ Pyralux® AP All Polyimide Flexible Laminate is a high performance, environmentally compliant material engineered for the most demanding flexible and rigid-flex circuit applications. With low CTE, excellent thermal resistance, high copper adhesion, and UL 94V-0 flammability rating, it delivers unmatched reliability in automotive, aerospace, industrial, and telecommunications systems. Its IPC-4204/11 certification, compatibility with standard PWB processes, and RoHS compliance ensure ease of integration and global market acceptance.
For engineers designing next-generation electronics that must perform under extreme conditions, it is not just a material choice it’s a commitment to quality, durability, and innovation. As the electronics industry continues to evolve toward higher speeds, greater miniaturization, and harsher operating environments, Pyralux® AP remains at the forefront, providing the foundation for reliable, high performance flexible circuits. By choosing Pyralux® AP laminate, manufacturers can achieve superior performance, enhanced safety, and extended product lifetimes.
If you have any further questions, please feel free to leave a comment below or contact QFPCB by email ([email protected]).
