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The material that JLCPCB use is FR4-Standard Tg 140C. There is FR4 material available only. The material like Aluminum, Rogers, Flexible material is not available so far in JLCPCB.
Note: Basically, there is an anti-fake marking on the base material, since it is on the material itself, we have no idea about whose order will get it with the marking. So please kindly check whether it is acceptable or not if there is a marking on your PCB when you place your order.