Inquire: Call 0086-755-23203480, or reach out via the form below/your sales contact to discuss our design, manufacturing, and assembly capabilities.
Quote: Email your PCB files to Sales@pcbsync.com (Preferred for large files) or submit online. We will contact you promptly. Please ensure your email is correct.
Notes: For PCB fabrication, we require PCB design file in Gerber RS-274X format (most preferred), *.PCB/DDB (Protel, inform your program version) format or *.BRD (Eagle) format. For PCB assembly, we require PCB design file in above mentioned format, drilling file and BOM. Click to download BOM template To avoid file missing, please include all files into one folder and compress it into .zip or .rar format.
DuPont Pyralux FR9110R is one of the most widely specified single-sided copper-clad laminates in the flexible PCB world. If you’ve been digging through IPC material sheets trying to nail down the right flame-retardant flex laminate for your next design, you’ve probably landed on this product code more than once. This article breaks down everything you need to know — construction, electrical properties, mechanical data, lamination parameters, and how it stacks up against similar grades in the Pyralux FR family.
DuPont Pyralux FR9110R is a single-sided, copper-clad flexible laminate made from DuPont™ Kapton® polyimide film bonded to rolled-annealed (RA) copper foil using a proprietary, flame-retardant, C-staged acrylic adhesive. The “R” suffix in the product code tells you it uses rolled-annealed copper — important if you’re designing for dynamic flex applications where the circuit bends repeatedly in service.
Pyralux® FR copper-clad laminate is a composite of DuPont™ Kapton® polyimide film with copper foil on one or both sides, bonded together with a proprietary, flame-retardant, C-staged acrylic adhesive, recommended for use in single-sided, double-sided, multilayer, and rigid-flex circuits that require flame retardancy.
The FR9110R sits in the middle of the FR single-sided lineup — not the thinnest available, but a well-balanced construction that combines a 1 oz copper foil, a 1 mil adhesive layer, and a 1 mil Kapton® film. It’s the go-to spec for designs that need UL flame certification, solid peel strength, and proven dimensional stability.
For engineers working on Dupont PCB projects, understanding exactly how FR9110R sits within the broader Pyralux FR family is key to making the right material call for your design.
DuPont Pyralux FR9110R Construction Details
The product code suffix “R” specifies rolled-annealed copper. Electrodeposited copper is specified with “E,” and rolled-annealed double-treated copper uses “D.”
Here is the complete layer construction for FR9110R:
Layer
Thickness (Imperial)
Thickness (Metric)
Copper Foil (RA)
1 oz/ft²
35 µm (305 g/m²)
Acrylic Adhesive (C-staged)
1 mil
25 µm
Kapton® Polyimide Film
1 mil
25 µm
Total Stack Thickness
~3 mil
~75 µm
IPC Certification: Yes — certified to IPC-4204/1: “Flexible Metal-Clad Dielectrics for use in Fabrication of Flexible Printed Wiring.”
The C-staged adhesive in the copper-clad is fully cured when delivered from DuPont. This is worth noting because it distinguishes the clad from coverlays and bondplys, which use B-staged adhesive and require handling precautions against skin contact with unreacted monomers.
DuPont Pyralux FR9110R Full Technical Specifications
Electrical Properties
Property
Typical Value
Test Method
Dielectric Constant (Dk) @ 1 MHz
3.5
IPC-TM-650 No. 2.5.5.3
Dielectric Constant (Dk) @ 10 GHz
3.0
ASTM D2520
Loss Tangent (Df) @ 1 MHz
0.02–0.03
IPC-TM-650 No. 2.5.5.3
Loss Tangent (Df) @ 10 GHz
0.02
ASTM D2520
Dielectric Strength
137 kV/mm (3500 V/mil)
ASTM D-149
Insulation Resistance (ambient)
10⁶ megohms
IPC-TM-650 No. 2.6.3.2
Volume Resistivity (ambient)
10⁹ megohm·cm
ASTM D-257
Surface Resistance (ambient)
10⁷ megohms
ASTM D-257
Note: The Dk/Df values at 1 MHz represent the full 1 oz RA copper / 1 mil adhesive / 1 mil Kapton® construction. Higher-frequency values apply to the dielectric system only and are useful when estimating controlled-impedance performance on RF-adjacent flex designs.
Mechanical Properties
Property
Typical Value
Test Method
Peel Strength (after lamination)
2.1 N/mm (12 lb/in)
IPC-TM-650 No. 2.4.9 Method B
Peel Strength (after soldering)
1.9 N/mm (11 lb/in)
IPC-TM-650 No. 2.4.9 Method D
Solder Float Resistance (10 sec @ 288°C)
Pass
IPC-TM-650 No. 2.4.13 Method B
Thickness Tolerance
+10%
IPC-TM-650 No. 4.6.2
Dimensional Stability (MD)
−0.10%
IPC-TM-650 No. 2.2.4 Method B
Dimensional Stability (TD)
−0.10%
IPC-TM-650 No. 2.2.4 Method C
Flammability and Compliance
Attribute
Value
UL Flammability Rating
VTM-0 (UL94)
UL796 Direct Support
Yes
PBB / PBBO / PBDE Content
None — confirmed RoHS compliant
IPC-4204/1 Certification
Yes
ISO 9001:2015 Manufacturing
Yes
Pyralux FR9110R vs. Similar Single-Sided FR Laminates
One of the most common questions from engineers is: “Why FR9110R and not FR9120R or FR7002R?” The answer is usually driven by total circuit thickness, flex bend radius, and copper weight needs. The table below shows how FR9110R fits into the broader single-sided FR product lineup.
Product Code
Copper (oz/ft²)
Adhesive (mil/µm)
Kapton® (mil/µm)
IPC Cert.
FR7002R
1 (35 µm)
0.5 (13 µm)
0.5 (13 µm)
No
FR7011R
1 (35 µm)
0.5 (13 µm)
1 (25 µm)
Yes
FR9110R
1 (35 µm)
1 (25 µm)
1 (25 µm)
Yes
FR9120R
1 (35 µm)
1 (25 µm)
2 (51 µm)
Yes
FR9150R
1 (35 µm)
1 (25 µm)
5 (127 µm)
Yes
FR9210R
2 (70 µm)
1 (25 µm)
1 (25 µm)
Yes
Practical guidance:
Choose FR7011R when you need a thinner overall stack with less adhesive but still want IPC certification.
Stay with FR9110R when the full 1 mil adhesive thickness is needed for reliable coverlay bonding or when adhesive flow requirements are critical.
Step up to FR9120R or FR9150R when you need a stiffer base film for handling during fabrication or when circuit stiffness is a feature of your design.
Go to FR9210R for 2 oz copper when you need higher current-carrying capacity or lower trace resistance.
Lamination and Processing Parameters
Lamination conditions for Pyralux® FR flexible composites are typically: Part Temperature 182–199°C (360–390°F), Pressure 14–28 kg/cm² (200–400 psi), Time 1–2 hours at temperature.
Processing FR9110R follows the same workflow as Pyralux® LF. If you’re already set up for LF materials, the transition is essentially transparent. A few practical notes from the shop floor:
Drilling and routing: Always use adequate vacuum extraction around the drill head. Even though the C-staged adhesive in the clad is fully cured, routing generates fine dust that should be kept away from operators.
Handling: Thin copper-clad laminates have sharp metal edges — gloves are not optional. The copper at 35 µm is thin enough that edge burrs can cause cuts during panel handling.
Coverlay bonding: When bonding FR-series coverlays over FR9110R, the acrylic-to-acrylic compatibility is excellent. You do not need to plasma treat or rough up the adhesive surface prior to lamination under standard conditions.
Storage Conditions and Shelf Life
Pyralux® FR flexible laminates should be stored in the original packaging at temperatures of 4–29°C (40–85°F) and below 70% humidity. The product should not be frozen and should be kept dry, clean, and well protected. Subject to compliance with the foregoing handling and storage recommendations, DuPont’s warranties shall remain in effect for a period of two years following the date of shipment.
In practice, most fabricators store FR laminates in climate-controlled warehouses and rotate inventory on a FIFO basis. If you’re receiving material from a distributor, always check the batch label for the shipment date and request the Certificate of Conformance — DuPont provides one with every manufactured lot.
Packaging and Sheet Dimensions
Pyralux® FR copper-clad laminates are supplied in 24 in (610 mm) × 36 in (914 mm) sheets. There is a minimum of four sheets and a maximum of 25 sheets per pack.
These sheet dimensions are standard across the Pyralux FR copper-clad family. If your panel size or fabrication process requires non-standard dimensions, DuPont can supply special-order sizes — contact your regional DuPont or authorized distributor representative for custom dimensions and roll availability.
Typical Application Areas for DuPont Pyralux FR9110R
FR9110R is broadly applicable wherever flame retardancy, high reliability, and thin flexible construction are required simultaneously. Some of the most common use cases include:
Aerospace and Defense: Avionics flex circuits operating in thermal and vibration environments benefit from the combination of Kapton® stability and UL VTM-0 flame rating. The dimensional stability spec (±0.10% in both axes) is critical for maintaining registration in multi-up panels.
Consumer Electronics: Wearables, foldable devices, and camera modules where thin, single-sided flex traces route around tight mechanical radii. The RA copper in FR9110R handles repeated flexing far better than electrodeposited copper.
Automotive Electronics: Dashboard instrumentation, sensor arrays, and infotainment flex connectors where operating temperatures cycle widely. Kapton® polyimide’s thermal stability from −200°C to +300°C short-term makes FR9110R viable in underhood-adjacent locations.
Medical Devices: Non-implant medical electronics, diagnostic instruments, and wearable monitoring devices where UL certification and dimensional precision are required by design control processes.
Industrial and Telecommunications Equipment: Compact instrumentation, test equipment flex interconnects, and antenna feedlines where controlled-impedance single-sided flex is a cost-effective alternative to rigid multilayer substrates.
Useful Resources for DuPont Pyralux FR9110R
Resource
Description
Link
DuPont Pyralux FR Product Page
Official product overview, certifications, and contact
Frequently Asked Questions About DuPont Pyralux FR9110R
Q1: What does the “R” suffix mean in DuPont Pyralux FR9110R?
The “R” suffix specifies rolled-annealed (RA) copper foil. RA copper has a grain structure that runs parallel to the foil surface, which gives it significantly better fatigue resistance under repeated bending compared to electrodeposited (ED) copper. For static flex designs, you can use the “E” version (FR9110E). For any dynamic or repeated-flex application, always specify the “R” variant.
Q2: What is the total thickness of the FR9110R stack?
With 1 oz copper (35 µm), 1 mil adhesive (25 µm), and 1 mil Kapton® (25 µm), the total nominal stack thickness is approximately 85 µm (approximately 3.3 mil), though this can vary slightly within the +10% thickness tolerance. When designing controlled-impedance structures, always confirm the actual lot thickness with your fabricator before finalizing impedance targets.
Q3: Can FR9110R be used in multilayer flex designs?
Yes. DuPont specifically lists multilayer and rigid-flex constructions as recommended applications for the entire Pyralux FR family. When building multilayer flex, FR9110R typically serves as an outer or inner copper-clad layer, with FR bond ply used for inter-layer bonding and FR coverlay for surface protection. The acrylic adhesive systems are fully compatible throughout the FR product family.
Q4: Is DuPont Pyralux FR9110R RoHS and REACH compliant?
Yes. Pyralux® FR flexible composites do not contain polybrominated biphenyls (PBBs), polybrominated biphenyl oxides (PBBOs), or polybrominated diphenyl ethers (PBDEs). These are the primary halogenated flame retardant compounds of concern under RoHS and REACH. DuPont manufactures FR9110R under an ISO 9001:2015 quality management system, and a Certificate of Conformance is available with every production batch.
Q5: How does FR9110R compare to Pyralux AP for high-frequency applications?
FR9110R is an acrylic adhesive-based system with a Dk of 3.5 at 1 MHz, which is adequate for most standard flex circuit applications. Pyralux AP, by contrast, is an adhesiveless all-polyimide laminate with tighter Dk consistency across frequency and lower loss tangent. For designs operating above a few hundred MHz where signal integrity is critical, AP-series materials are the better choice. For standard flex interconnect, power routing, and sub-GHz applications where UL flame certification is required, FR9110R provides the right combination of performance and cost.
Final Thoughts: Is FR9110R the Right Flex Laminate for Your Design?
DuPont Pyralux FR9110R earns its place as a standard spec in the flex PCB industry because it hits a practical sweet spot: it carries IPC-4204/1 certification, achieves UL94 VTM-0 flammability, uses RA copper for fatigue resistance, and delivers well-documented electrical and mechanical performance in a balanced 1-1-1 (mil) construction. For engineers who need a flame-retardant, single-sided flex base with a proven fabrication history, it’s a low-risk material choice backed by decades of DuPont manufacturing consistency.
Where it is not the right answer: very thin or ultra-lightweight designs where every 0.5 mil matters, or high-frequency/high-speed signal applications above ~1 GHz where an adhesiveless system like Pyralux AP delivers meaningfully better loss performance.
For most standard flexible circuit applications in aerospace, automotive, industrial, and consumer electronics — FR9110R is a safe, well-supported, and thoroughly documented choice.
Inquire: Call 0086-755-23203480, or reach out via the form below/your sales contact to discuss our design, manufacturing, and assembly capabilities.
Quote: Email your PCB files to Sales@pcbsync.com (Preferred for large files) or submit online. We will contact you promptly. Please ensure your email is correct.
Notes: For PCB fabrication, we require PCB design file in Gerber RS-274X format (most preferred), *.PCB/DDB (Protel, inform your program version) format or *.BRD (Eagle) format. For PCB assembly, we require PCB design file in above mentioned format, drilling file and BOM. Click to download BOM template To avoid file missing, please include all files into one folder and compress it into .zip or .rar format.
