I am going to rely on formatting to assist my answer, always risky in e-mail White Tin is a type of immersion Tin, and more or less interchangeable, depending on who you are talking to, and who they work for....so the question boils down to ENIG vs. Immersion Tin. Property ENIG Immersion Tin Process problems BIG & BOLD Relatively few Quality Window What?? Large Ease of Soldering Real Easy Relatively easy, to a certain age Shelf Life Real Long Normally 6 months Years ?? Pray for preservation of format. Rudy Sedlak RDChemical Company --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------