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  PCB Materials,FR-4 PCB Materials

For some designs, PCB dielectric properties are critical

Whether it's high-speed designs, RF, microwave, or mobile applications - where power management is key, you're finding more situations that require dielectric PCB properties in your prototypes that standard FR-4 just can't deliver. We know that. That's why we've added Rogers 4000-series dielectric materials to our PCBExpress Quickturn product line. These new low-loss dielectric materials mean greater performance for your high-demand PCB prototypes.

Most printed circuit boards (PCB) are manufactured using glass-reinforced epoxy laminate as the substrate. While there are a wide variety of laminates available on the market, FR-4 is both versatile and well-accepted as a standard material for PCB manufacture. FR-4 functions well as an electrical insulator, and has a good strength-to-weight ratio, and is flame resistant.

The standard FR-4 material is a high temperature, high Td, low CTE 150Tg material.

If a higher Tg material is required, we do stock a 170Tg version of our standard FR-4 material as well, that can be substituted in our PCBpro Full Feature and Custom Quote products (provide a readme file or a print note specifying the 170 Tg material). There may be a material lead time for some specific sizes or thickness, and may impact due date.

Note: The 170Tg FR-4 material has equivalency for electrical and mechanical properties with the popular Isola 370HR material, and functions very similarly. There is one documented physical difference, Isola's 370HR is listed as a 180Tg material.    

MOKO Technology LTD's Standard FR-4 Material Properties

    High Glass Transition Temperature (Tg) (150Tg or 170Tg)
    High Decomposition Temperature (Td) (> 325º C)
    Low Coefficient of Thermal Expansion (CTE) ((3.0%-3.8%)
    Dielectric Constant (@1 GHz): 4.25-4.55
    Dissipation Factor (@ 1 GHz): 0.016
    UL rated (94V-0, CTI = 4)
    Compatible with standard and lead-free assembly.
    Laminate thickness available from 0.005” to 0.125”
    Pre-preg thicknesses available (approximate after lamination):
        (1080 glass style) 0.0022”
        (2116 glass style) 0.0042”
        (7628 glass style) 0.0075”

150 Tg FR-4 material is used on all standard PCBExpress Quickturn, ValueProto and all PCBpro Full Feature orders unless another specific material or Tg is called out (PCBpro Full Feature or Custom Quote).

Let us view more imformation on FR-4 material

FR-4 (or FR4) is a grade designation assigned to glass-reinforced epoxy laminate sheets, tubes, rods and printed circuit boards (PCB). FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant (self-extinguishing).

"FR" stands for flame retardant, and denotes that safety of flammability of FR-4 is in compliance with the standard UL94V-0. FR-4 is created from the constituent materials (epoxy resin, woven glass fabric reinforcement, brominated flame retardant, etc.) by NEMA in 1968.

FR-4 glass epoxy is a popular and versatile high-pressure thermoset plastic laminate grade with good strength to weight ratios. With near zero water absorption, FR-4 is most commonly used as an electrical insulator possessing considerable mechanical strength. The material is known to retain its high mechanical values and electrical insulating qualities in both dry and humid conditions. These attributes, along with good fabrication characteristics, lend utility to this grade for a wide variety of electrical and mechanical applications.

NEMA is the regulating authority for FR-4 and other insulating laminate grades. Grade designations for glass epoxy laminates are: G10, G11, FR4 and FR5. Of these, FR4 is the grade most widely in use today. G-10, the predecessor to FR-4, lacks FR-4's self-extinguishing flammability characteristics. Hence, FR-4 has since[when?] replaced G-10 in most applications.

FR-4 epoxy resin systems typically employ bromine, a halogen, to facilitate flame-resistant properties in FR-4 glass epoxy laminates. Some applications where thermal destruction of the material is a desirable trait will still use G-10 non flame resistant.

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