Surface finish : lead free hasl, immersion gold, gold plating osp immersion pin Min line width: 3mil Min line space: 3mil Min space between pad to pad :3 mil Min hold diameter 0.1um Max size of finish board: 23inch*35inch Max proportion drilling hold and bord thickness: 1:12.5 Rang of finish board thickness: 0.21~0.7mil Min tickness soldermask :10um Min line width of idents: 4mil Min height of idents: 25mil Color of silk screen: yellow white blue Soldermask: green yellow blue red balck white transparent photesensitive soldermask strippable soldermask Date file foemat: gerber file, drilling file, protel series , pads2000series, powerpcb series odb++ E test: 100% e test, high voltage test Material pcb: fr4 high tg fr4 halogen free, rogers, cem-1 , arlon taconic, ptfe, isola.