Welcome to Well-Tech - one of the leading manufacturers and suppliers of PCB products in China. Our factory is engaged in PCB manufacturing and offering customized displayer printed circuit board 4 layers fr4 with immersion tin at competitive price. High reliability, strong diversity and expert advice are our characteristics. Please contact us if you have inquiry.

Products description:

Immersion Tin: Pure tin deposition by dipping with a thickness of between 0.8 µm to 1.1 µm. Finishing is Lead Free and with RoHS compliant. Excellent flatness, recommended for complex SMD, Fine Pitch BGA, Press Fit and Multisolder. It can be stored up to 1 year. The main advantage is that it can be re-worked or re-freshed due to oxidation or storage expiration. The problem is the tin whiskers.

Products specification:

Layers: 4

Material /Laminate: FR4 TG140

Board thickness: 1.6mm

Copper weight: 1/1/1/1oz

Finishing: Immersion Tin

The affect of surface treatment on soldering as below,