PCB Substrate Materials for China Sourcing
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When you source PCBs in China, the laminate material drives both performance and cost. Standard FR4 (Tg 130-170°C) is the default and cheapest option, while high-frequency boards for RF and radar work move to Rogers 4003C/4350B or PTFE, which can multiply bare-board cost 3-8x. Polyimide and metal-core (MCPCB) substrates show up for flex and high-power LED designs respectively.
The substrate spec quietly determines your unit price, lead time, and which fabs can even quote you. A common pitfall is letting a fab silently substitute a cheaper FR4 grade or a Rogers clone laminate; always pin down the exact material part number and ask for the laminate maker's certificate of conformance.
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FAQ
How much more does a Rogers PCB cost versus FR4 from China?
Expect a 3-8x bare-board cost multiplier depending on the exact Rogers grade (4003C is cheaper than RO3000/PTFE series) and copper foil. The premium comes from the laminate itself plus tighter process control during lamination and drilling.
What PCB material do I need for a 2.4 GHz or sub-6 GHz design?
For most 2.4 GHz BLE/Wi-Fi designs, a controlled mid-Tg FR4 with a known dielectric constant (Dk ~4.3) is acceptable if impedance is tuned. For 5G sub-6 GHz, 24/77 GHz radar, or low-loss requirements, you move to Rogers 4350B or PTFE-based laminates.
How do I stop a Chinese fab from substituting cheaper laminate?
Specify the exact laminate part number and Tg in your fab notes, require a material certificate of conformance per batch, and for critical RF jobs request a cross-section or TDR impedance report on the first article.
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