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Conductive carbon inks for keypads, what specifications? IPC standard?

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Conductive carbon inks for keypads, what specifications? IPC standard? | 6 April, 2021

Hello, does anyone know if there is an IPC standard for carbon ink? we use for keypads instead ENIG, we found batchs of PCB with 2-3ohm, 20ohm, until 300ohm( resistance of contact surface) by the same PCB supplier!

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