... ,immersion gold,OSP,immersion silver,immersion tin,peelable mask Board Size: 650mm*1000mmBoard Layer: 1L-4LBoard thickness: 0.8mm ... / immersion gold/ immersion tin/ immersion silver layerSingle-side al substrate / double-side al substrate /4-layer al substrate maximum measurement1200mm*460mm ... 15mmbreakdown voltage 3KV - 5KVpeel strength≥1.4N/mm double layer aluminum pcb board with single sided v-cut