... ( such as circuit boards, electronic devices) and hardware, accessories, and other surface treatment. Immersion tin process characteristics1.Bake ... year), or by eight days of high temperature and humidity test (45 ℃, relative humidity 93%), still has excellent solderability after reflow ... industry,Keyboard products Parameter:oItemData1Layer:1 to 24 layers2Material type:FR-4, CEM-1, CEM-3, High TG ...