I use silicone coatings. We cannot use the tape test, since no adhesive tape that we have found sticks to the silicone. All tape tests failed between the tape and coating. We have used alternate methods. We used wet 3-1753 (or 1765) as an adhesive between the coating and a substrate used for pull tests. In every test, the failure mechanism was cohesive, within the coating. The only problems where adhesive failure occurred was with one vendor who was shipping "dirty" boards. Aric Parr [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: RE: Conformal Coating Adhesion Testing Author: [log in to unmask] at internet Date: 11/22/96 1:09 AM I recommend that you read through ASTM D3359 "Methods for Measuring Adhesion by Tape Test" and a recent CRADA report "Evaluation of Low-Residue Soldering for Military and Commercial Applications: A Report from the Low-Residue Soldering Task Force". The CRADA study included coating adhesion evaluation using ASTM D3359 like tape adhesion tests on MIL-I-46058C coupons. There is a good description of the test, the sample conditioning and some of the pitfalls of the test. Experience is needed to get consistent cut and peel-by-tape testing. Every cut has to be made with a good sharp blade. An experienced operator examines his blade often under magnification and replaces it at the first sign of wear. Also, he/she is able to apply consistent pressure on each cut. Mary Davis Sr. Material & Process Engineer Alliant Techsystems 206-356-3311 [log in to unmask] ---------- From: Yuen, Mike[SMTP:[log in to unmask]] Sent: Thursday, November 21, 1996 7:04 PM To: [log in to unmask] Subject: ASY: Conformal Coating Adhesion Testing I need any information of how to test the adhesion of silicone conformal coatings. I have heard about performing tape tests, but I would like more information. Currently, we are using Dow Corning 1-2577 and 3-1765. Any help would be appreciated. Heather Benedict Process Engineer 414-751-5490 ************************************************************************** * * 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. * *************************************************************************** *************************************************************************** * 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. * ***************************************************************************