... FR-4,thickness 0.2-3.2mm copper weight 0.5-2.0mil,surface finished Immersion gold,high quality,low price ... °,60°Range of bevel ange25°-60°Warp and twist≤0.5%Surface treatmentHAL/HAL lead free,gold finger,OSP,silver,goldType ... -3,TG 180ITEMS SHOW FACYORY SHOW PCB manufacturer,PCB & PCBA supply for eledtronic ompenents