Clear Soldermask or Unpigmented Soldermask will hold a very tight tolerances. It is typical to see 2 mil registration with this type of soldermask. Most manufactures of LPI soldermask offer Clear version. It has also been approved by IPC on IPC-SM-840C. ______________________________ Forward Header __________________________________ Subject: Soldermask-misregistration Author: [log in to unmask] at corp Date: 9/5/96 11:48 AM Does anyone know if there is a particular soldermask that will keep tighter registration. For instance, is a liquid soldermask able to keep a tighter registration than a dry film? Currently, we allow for a 4mil misregistration in our soldermask opening. We would like to bring that number down to 2 or 1mil on a very tight board we have (that has cooper covering the ground pads-causing the ground pads to have a larger shape) without having the manufacturer scrap alot of boards. Our plating is immersion nickel/gold. Thank-you Charlene Dwyer [log in to unmask] **************************************************************************** * The 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. * **************************************************************************** **************************************************************************** * The 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. * ****************************************************************************