Hot Air Solder Level circuit board

multilayer LF-HASL circuit board. Base material FR4(S1141, TG140). Surface treatment LF-HASL 1-38um. Green colour soldermask circuit board.
Our common FR4 materials are: KB(6160; 6165; 6167) ; Shengyi (S1141; S1000-2);  ITEQ(only IT180). We sometimes purchase part ISOLA materials, too.

And the soldermask colour can be: green, bule, white,black, red, yellow, orange, matt-green(semi green), matt-black. 

The silkscreen colour can be: white, black, yellow.
Copper thickness can be: 1-10 oz Outer and 0.5-8 oz inner.
Surface treatment(surface finished) can be: HASL, Lead-free HASL, Hard Gold plating, Immersion Gold, Immersion Silver, Immersion Tin, OSP and the Options: Gold Tabs, Selective Au, Carbon Ink, Peelable Mask, Micro Via, Controlled Impedance, Score, LASER Drill, Blind Vias and Buried Vias.
The Multilayer printed circuit board is mainly used in communication, scientific research, spaceflight and so on. It provides the necessary foundation for the progress of society and the development of science and technology.