It is essential that a barrier coat of copper or nickel be used between the tin and zinc-containing basis metals. Likewise it is essential to use a barrier coat of nickel over aluminum prior to depositing tin or tin alloys. Widely used in food handling and packaging. Can be safely used with neutral or slightly acidic foods. Same characteristics as tin with the reduction of the tendency for the surface to grow thin metal filaments called whiskers, from its surface.
Whiskers can cause electrical malfunctions by bridging circuit elements.
Excels in solderability.