pcb circuit boards multi-layer equipment control board 4-layer and 8-layer fr-4 material proofing batch

processing custom: yes item no: 299 brand name: lingbang model: 299 mechanical rigidity: rigidity number of layers: multiple layers base material: copper insulation material: organic resin insulation layer thickness: conventional board flame retardant properties :vo board processing technology: electrolytic foil reinforcement material: glass fiber cloth base.syi