yes to both on Matte mask under most circumstances. This is based upon experimental derivation. Matte mask offers less surface area for solderball adhesion in wave, but more area for conformal coat. P.S. matte mask is also more difficult to clean than glossy mask. ______________________________ Reply Separator _________________________________ Subject: Assy: LPI Matte vs Gloss and Conformal Coating Author: [log in to unmask] at internet Date: 8/20/96 9:39 AM We are beginning to see more PCB suppliers offering matte finish LPI. We have heard that this finish reduces the adherence of solderballs. Is this true? If so, at which process, reflow or wave? What is the science behind this lessening of solderballs? 2nd Question: We are also starting a project that will require conformal coating. Is there a preference in solder mask type/finish? The coatings we are leaning towards are silicone-based. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************