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    AI Overview
    Multi Layer PCB-FR4-4 Layers-Lead Free Hasl-Smart Home PCB ...
    FR-4 PCB with HASL (Hot Air Solder Leveling) finish is a widely used, cost-effective standard for electronics, offering excellent durability and solderability. It combines a fire-resistant epoxy/glass substrate (FR-4) with a molten solder coating (HASL) to protect copper from oxidation. It is ideal for, but not limited to, through-hole and larger surface-mount components. 
    Key Aspects of FR-4 HASL PCB 
    • Structure: FR-4 is a flame-retardant epoxy resin and woven fiberglass composite.
    • Surface Finish: HASL involves dipping the board into molten solder and removing excess with hot air knives.
    • Types: Available in standard tin-lead (SnPb) or RoHS-compliant lead-free (LF-HASL) options.
    • Main Benefits: Provides superior surface solderability, high durability, and lower cost compared to alternatives like ENIG.
    • Limitations: The surface is less flat (uneven) compared to other finishes, making it less suitable for fine-pitch components (e.g., QFP, BGA). 
    Common Applications 
    • Consumer electronics
    • Power supplies
    • Industrial control systems
    • Prototypes and simple, low-cost assemblies 
    Typical Specifications 
    • Thickness: 1.6mm is standard, though options range from 0.6mm to 3.2mm.
    • Copper Weight: 1 oz to 12 oz.
    • Solder Mask: Usually green, but red, blue, black, and white are common options. 
    Pros and Cons 
    • Pros: Low cost, readily available, long shelf life, high solder joint reliability.
    • Cons: Not perfectly flat (unevenness), not suitable for tiny SMT components, leaded versions are not RoHS compliant. 
    • Exploring Different Finishes for FR 4 PCBs: HASL, ENIG, and ...
      Dec 12, 2025 — FR-4 PCB surface finishes protect against oxidation, enhance solderability, and ensure compatibility with assembly processes. Opti...
      aivon
    • FR4 PCB, 2 layer PCB | PS Electronics LLC
      Regular FR4 PCB. Product Specification: Material: FR-4. Tg: 130-190℃ Copper Weight: 1-12oz. Thickness(mm): 0.6, 1.0, 1.2, 1.6, etc...
      www.quick-pcba.com
    • FR4 PCB Surface Finishes | PCB Copper Protection - Daleba
      A popular, low cost, environmentally friendly finish to prevent that oxidisation and provide an improved surface for solderability...
      Daleba
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    Web results

    Exploring Different Finishes for FR 4 PCBs: HASL, ENIG, ...


    aivon
    https://www.aivon.com › Blog › PCB Manufacturing
    aivon
    https://www.aivon.com › Blog › PCB Manufacturing
    Dec 12, 2025 — FR-4 PCB surface finishes protect against oxidation, enhance solderability, and ensure compatibility with assembly processes. Options like HASL, ...Read more
    People also ask
    What is HASL PCB finish?
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    What is FR4 PCB material?
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    What is the difference between HASL and LF HASL?
    LF Hot Air Solder Leveling or LF-HASL is identical to the standard HASL process. However, it does have an obvious difference, i.e., it does no use Tin and Lead Solder. Instead, you will use a Tin and Copper, Tin and Nickel, or Tin, Copper, and Nickel germanium.Jan 19, 2021

    PCB Finishes – Lead-Free HASL - Nova Engineering


    Nova Engineering
    https://novaenginc.com › pcb-finishes-lead-free-hasl
    Nova Engineering
    https://novaenginc.com › pcb-finishes-lead-free-hasl
    What is the difference between HASL and Enig finish?
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    Web results

    FR4 PCB Material Manufacturing - Fast & Affordable


    JLCPCB
    https://jlcpcb.com › pcb-fabrication › fr4-pcb
    JLCPCB
    https://jlcpcb.com › pcb-fabrication › fr4-pcb
    JLCPCB offers high-quality FR4 PCBs with multiple thickness options, fast 24-hour turnaround, and affordable pricing.

    Multi Layer PCB-FR4-4 Layers-Lead Free Hasl-Smart ...


    JHDPCB
    https://jhdpcb.com › Industry Application › Smart Home
    JHDPCB
    https://jhdpcb.com › Industry Application › Smart Home
    PCB Type: Multilayer PCB; Base material: FR4; Layers: 4 Layers; PCB thickness: 1.6mm; Inner (outer) layer copper thickness: 1 OZ/1 OZ; Surface treatment: Lead ...Read more

    Understanding FR4 PCB Specifications for Precision Electronics


    fr4material.com
    https://fr4material.com › Blog
    fr4material.com
    https://fr4material.com › Blog
    FR4 PCBs may have various surface finishes, such as HASL (Hot Air Solder Leveling) or ENIG (Electroless Nickel Immersion Gold), influencing solderability. The ...Read more

    FR4 PCB Surface Finishes | PCB Copper Protection


    Daleba
    https://www.daleba.co.uk › pages › FR4-PCB-Surface-F...
    Daleba
    https://www.daleba.co.uk › pages › FR4-PCB-Surface-F...
    A popular, low cost, environmentally friendly finish to prevent that oxidisation and provide an improved surface for solderability.Read more

    The Ultimate Guide to HASL: Process, Materials, and Best ...


    ALLPCB
    https://www.allpcb.com › ... › PCB Knowledge
    ALLPCB
    https://www.allpcb.com › ... › PCB Knowledge
    Aug 25, 2025 — 4. Hot Air Leveling for Uniform Finish. After the PCB is removed from the molten solder bath, excess solder is leveled using hot air knives.Read more

    Custom Design FR-4 PCB HASL Finish ...


    Bicheng PCB
    https://www.bichengpcb.com › fr-4-pcb-hasl-finish_sp
    Bicheng PCB
    https://www.bichengpcb.com › fr-4-pcb-hasl-finish_sp
    PCB with Peelable Mask Double Sided Circuit Board Built on Tg170 FR-4 Coating HASL. This is a type of 2 layers PCB board built on FR-4 Tg170 substrate for the ...Read more

    PCB Surface Finishes Introduction and Comparison


    PCBCart
    https://www.pcbcart.com › article › content › surface-fini...
    PCBCart
    https://www.pcbcart.com › article › content › surface-fini...
    There are two main types of surface finishes: metallic and organic. HASL, ENIG/ENEPIG, Immersion gold and Immersion Tin all belong to metallic surface finishes.Read more

    Choosing the right finish


    Sierra Circuits
    https://sierraconnect.protoexpress.com › choosing-the-ri...
    Sierra Circuits
    https://sierraconnect.protoexpress.com › choosing-the-ri...
    Apr 8, 2024 — Most of the PCB fabs I know recommend a minimum lower limit of 10 mil (0.254 mm) for HASL. However, for assembly houses that handle both PCB ...Read more

    effects of surface finish on high frequency signal loss using ...


    agc-multimaterial.kr
    https://www.agc-multimaterial.kr › vs-uploads › 1...
    agc-multimaterial.kr
    https://www.agc-multimaterial.kr › vs-uploads › 1...
    PDF
    by D Cullen · Cited by 34 — In the current state of circuit board fabrication, FR-4 substrates are most common. Copper conductors of communications PCB's are most commonly finished with ...Read more
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