User manual 3M GOLD FINGER MASKING FOR WAVE SOLDER OR SOLDER REFLOW PROCESSES

[. . . ] Application Profile Market: Printed Circuit Board Assembly Application Description: Gold Finger Masking for Wave Solder or Solder Reflow Processes. Application Method Typically done manually. Die cut parts may also be used for a Land Grid Array (LGA) application. [. . . ] Available as die-cut parts: Tape may be die-cut into custom shapes and sizes by a converter to allow for masking of precise shapes like LGA sockets. 3M Industrial Markets Application Tips Due to the low bond strength of the tape, the user may observe some lifting on the edges after the PCB has gone through the process. The following suggestions may be used to prevent lifting: 1. Wrap tape around the board and adhere to the back, leaving the end on the top side of the board and not exposed to the solder wave. Use a small piece of 3M TM Low Static Polyimide Film Tape 5419 to hold down the edges with minimum risk of contamination. Related Application Idea Masking for chip on flex connection area during solder reflow process. This helps reduce contamination and improve the ACF connection of the flex circuit to LCD bond. A typical example is the ACF connection of Chip on Flex to color LCD for cell phones (shown in illustration at right). 3MTM Non-Silicone High Temperature Masking Tape 5563 protects the gold fingers on the flex socket attached to the LCD with AFC. Acrylic adhesive used in 5563 Tape will not contaminate the masked area with silicone that may cause failure in the AFC connection. 3MTM Non-Silicone High Temperature Masking Tape 5563 Key Decision Makers Manufacturing and Production Engineers Static Control Engineers For Additional Information To request additional product information or to arrange for sales assistance, call 1-800-362-3550. Address correspondence to: 3M Industrial Markets Customer Response Center, 3M Center, Building 220-8E-04, St. 3M MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. [. . . ] 3M shall not otherwise be liable for any loss or damages, whether direct, indirect, special, incidental, or consequential, regardless of the legal theory asserted, including, but not limited to, contract, negligence, warranty, or strict liability. Industrial Markets 3M Center, Building 220-8E-04 St. Paul, MN 55144-1000 Printed in USA Egfm5563. qxd © 3M 2002 [. . . ]