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    AI Overview
    Understanding the Dielectric Constant of FR4 Substrate in PCB
    Low Dk/Df FR-4 PCBs utilize specialized epoxy resins and glass weaves to lower dielectric constants (
    𝐷𝑘
    ≈3.7
    −4.2
    ) and dissipation factors (
    𝐷𝑓
    <0.010
    ) compared to standard FR-4, improving signal integrity for high-speed (
    >10
    Gbps
    ) and high-frequency applications while remaining cost-effective. These materials offer lower signal attenuation, faster propagation, and reduced latency. 
    Key Characteristics of Low Dk/Df FR-4 
    • Reduced Signal Loss: Low
      Dfcap D f
      𝐷𝑓
       (or loss tangent) reduces signal attenuation (heat) as signals travel, essential for high-frequency applications.
    • Faster Propagation: Lower
      Dkcap D k
      𝐷𝑘
       enables faster signal propagation and reduces crosstalk.
    • Improved Impedance Control: Lower
      Dkcap D k
      𝐷𝑘
       values allow for wider transmission lines on thinner laminates, which simplifies impedance control and reduces manufacturing cost.
    • Typical Materials: Advanced low-loss FR-4 alternatives (often epoxy-based) bridge the gap between standard FR-4 and high-frequency, higher-cost materials like PTFE. 
    Low Dk/Df vs. Standard FR-4 
    • Standard FR-4: Typically
      𝐷𝑘
      ≈4.2
      −4.5
      ,
      𝐷𝑓
      ≈0.016
      −0.020
       at 1 GHz.
    • Low-Loss FR-4: Optimized variants can achieve
      𝐷𝑓
      <0.005
      , offering significantly improved signal integrity.
    • Applications: Ideal for high-speed digital designs (10Gbps+), high-frequency, and RF circuits where standard FR-4 signal loss is excessive. 
    Applications 
    • High-speed networking equipment.
    • Telecommunications (5G boards).
    • High-speed digital signals (10–12 Gbps+).
    • High-frequency communication. 
    Considerations
    While low-Dk materials provide better performance, they are generally more expensive and may not be required unless the design demands superior signal integrity. In some cases, hybrid stackups are used where high-speed layers use low-loss materials while other layers use cheaper standard FR-4. 
    • Low-Dk PCB Material Advantages and Disadvantages | NWES Blog
      Mar 27, 2020 — A low-Dk PCB material has a low dielectric constant (real part). The term "Dk" refers to the real part of the dielectric constant,
      Northwest Engineering Solutions
    • When Do You Need Low-Dk PCB Laminates?
      Dec 10, 2024 — Compared to basic FR4 with Dk = 4.4 and Df = 0.02 at 10 GHz, the FR4 laminate has 4x the dielectric loss as the Rogers 3010 lamina...
      Interference Technology
    • Do You Need Low Dk PCB Materials?
      Dec 1, 2022 — and Arlon. and they are very useful in highfrequency boards but they are sometimes recommended for use in high-speed boards where ...
      13m
      YouTube·Altium Academy
    • The Ultimate Guide to Telecommunications PCB Materials: FR-4 vs. ...
      Jun 3, 2025 — Key Properties of High-Speed Laminates * Dielectric Constant (Dk): Typically much lower than FR-4, ranging from 2.2 to 3.5. This a...
      ALLPCB
    • The Ultimate Guide to Choosing the Right FR-4 Material for Your ...
      May 27, 2025 — FR-4 PCB Material Properties: What You Need to Know ... Here are the key FR-4 material properties every engineer should consider: ...
      ALLPCB
    • How to Choose Board Materials for Your PCB
      Sep 8, 2021 — you heat the board up it cools down you heat the board up it cools. down. and every time you heat the board up above the glass tra...
      3m
      YouTube·Altium Academy
    • What Is FR-4? A Complete Guide to the Most Common PCB Substrate
      Nov 5, 2025 — Electrical Characteristics. The electrical properties of FR-4 determine how well it insulates and transmits signals. Dielectric Co...
      pcbmaster
    • FR-4 PCB Manufacturing | High-Tg, Low-Loss, HDI - HilPCB
      Design Considerations: Stackup, Impedance and Loss Choose standard FR-4 for general purpose; move to low-loss when insertion loss ...
      HilPCB
    • FR4 PCB: A Guide to FR4 Material in Circuit Boards - UnityPCB
      Dec 25, 2024 — FR4 Material Characteristics ... V-0 indicates that once the fire source is eliminated, the material will quickly extinguish. FR4 ...
      UnityPCB
    • Low-Dk PCB Material Advantages and Disadvantages | NWES Blog
      Mar 27, 2020 — A low-Dk PCB material has a low dielectric constant (real part). The term "Dk" refers to the real part of the dielectric constant,
      Northwest Engineering Solutions
    • When Do You Need Low-Dk PCB Laminates?
      Dec 10, 2024 — Compared to basic FR4 with Dk = 4.4 and Df = 0.02 at 10 GHz, the FR4 laminate has 4x the dielectric loss as the Rogers 3010 lamina...
      Interference Technology
    • Do You Need Low Dk PCB Materials?
      Dec 1, 2022 — and Arlon. and they are very useful in highfrequency boards but they are sometimes recommended for use in high-speed boards where ...
      13m
      YouTube·Altium Academy
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    Low Dk / Df FR-4 High Thermal Reliability Printed Circuit ...


    Bicheng PCB
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    Low Dk / Df FR-4 High Thermal Reliability Printed Circuit Board TU-872 Multilayer PCB ; PCB thickness: 10mil (0.254mm), 15mil (0.381mm), 20mil (0.508mm), 25mil( ...Read more

    Guide to Low-Dk PCB Materials


    Altium
    https://resources.altium.com › guide-low-dk-pcb-materi...
    Altium
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    Dec 6, 2022 — Read our guide to low-Dk PCB materials like PTFE and low-loss FR4. These materials can be useful in high-speed designs, mixed signal, and RF ...

    When Do You Need Low-Dk PCB Laminates?


    Interference Technology
    https://interferencetechnology.com › Articles
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    Dec 10, 2024 — The factor 4 difference in dielectric loss is very clear. The real difference in total loss when Df values are very low (0.001 or less) comes ...Read more

    Dielectric Constant And Permittivity: PCB Dk & Df For FR-4 ...


    FastturnPCBs
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    Dec 17, 2025 — Df (loss tangent) increases slightly with frequency. Thicker or more resin-rich cores often have lower Dk and higher Df. Charts in technical ...Read more

    Guide to FR-4 Printed Circuit Board (PCB) Material


    NextPCB
    https://www.nextpcb.com › Blog
    NextPCB
    https://www.nextpcb.com › Blog
    Ask about result
    Aug 23, 2022 — FR-4 material typically provides a dielectric constant (Dk) somewhere between 4.25-4.55 depending on different factors such as glass weave style ...Read more

    New Low Dielectric Constant, High Tg, Printed Circuitry ...


    Isola Group
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    by R Bissell · Cited by 2 — Designers facing these challenges often specify PCBs made from materials with. Dk and Df values1, 2 significantly lower than FR4 laminates. Substrates made with ...Read more
    7 pages
    People also ask
    What is the DK value of FR4?
    Dielectric Constant (Dk): FR-4 typically has a Dk value of around 4.5 at 1 MHz, which affects signal speed and integrity. A higher Dk slows down signal transmission, which may be a concern for high-frequency designs.May 27, 2025

    The Ultimate Guide to Choosing the Right FR-4 Material for Your PCB ...


    ALLPCB
    https://www.allpcb.com › blog › pcb-knowledge › the-ul...
    ALLPCB
    https://www.allpcb.com › blog › pcb-knowledge › the-ul...
    Ask about result
    What is DK and DF in PCB?
    An error has occurred. Please try again later.
    What is a low DK PCB material?
    Low Dk (Less than 4): Low Dk materials are suitable for high-frequency applications such as microwave and RF circuits. These materials minimize signal loss and maintain signal integrity at high frequencies. Materials like PTFE (Polytetrafluoroethylene) fall into this category.

    PCB Material Selection Guide | San Francisco Circuits


    San Francisco Circuits
    https://www.sfcircuits.com › pcb-material-reference-guide
    San Francisco Circuits
    https://www.sfcircuits.com › pcb-material-reference-guide
    Ask about result
    What is FR in PCB?
    FR stands for flame retardant and meets the requirements of UL94V-0. FR4 has good adhesion to copper foil and has minimal water absorption, making it very suitable for standard applications. FR4 is either used as a copper-coated material for 1 and 2-layer PCBs or is used for multilayer PCBs as a Prepreg and core.

    FR4 Material - Circuit board glossary


    Multi Circuit Boards
    https://www.multi-circuit-boards.eu › support › fr4-mate...
    Multi Circuit Boards
    https://www.multi-circuit-boards.eu › support › fr4-mate...
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    Discussions and forums
    DK DF Values for PCBWay FR4 150-160
    Reddit · 
    r/AskElectronics
     · 2 years ago
    DK DF Values for PCBWay FR4 150-160
    Reddit · 
    r/AskElectronics
     · 2 years ago
    Hello, Im new the the whole pcb manufacturing space and need to route a board with differential pairs so the dk df value will be important ...  More
    FR4 Dielectric constant
    EEVblog · 
    3 years ago
    FR4 Dielectric constant
    EEVblog · 
    3 years ago
    It was actually difficult for PCB fabs to stock/use odd or specialty laminates. ... Slightly lower permittivity than regular FR-4, but provides ...  More
    Limitation using FR4 as dielectric in PCBs
    Forum for Electronics · 
    3 years ago
    Limitation using FR4 as dielectric in PCBs
    Forum for Electronics · 
    3 years ago
    Low-Dk PCB materials are often recommended for high-speed PCB design ... At 1 GHz you must be looking for low loss tangent FR4 such as...  More
    See more

    Web results

    FR4: Understanding the Material and Its Applications in ...


    Wevolver
    https://www.wevolver.com › article › fr4
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    Feb 13, 2025 — Dielectric Constant (Dk) and dissipation factor (Df) are two key electrical properties of FR4. Dielectric constant (Dk): Also known as relative ...Read more

    Beyond FR-4: Exploring Advanced Low Dk PCB Laminates ...


    aivon
    https://www.aivon.com › Blog › PCB Application
    aivon
    https://www.aivon.com › Blog › PCB Application
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    Apr 2, 2026 — Low Dk PCB laminates refer to substrates engineered with a dielectric constant significantly lower than traditional FR-4, typically enabling ...Read more

    Low Dk / Df FR-4 PCB High Thermal Reliability Printed Circuit ...


    circuitboardpcbs.com
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    Low Dk / Df FR-4 PCB High Thermal Reliability Printed Circuit Board (PCB) TU-872 Multilayer PCB ; Number Of Layers: 4 ; Glass Epoxy: TU-872 SLK Sp ; Final Height ...Read more
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