Mr. Crawford, I read your question on the Technet about concerns on spraying silicone conformal coatings. We just received a new spray and cure system that we will be spraying our boards with. We have been using silicone coating for about 15+ years and do not want to change because of our success with this coating. Two of the vendor selling points of the variety of spray systems that we investigated are that these systems utilize very low or even no air pressures to apply the coating, and the spray heads are of unique efficient design. Thus, very little overspray, thus very little chance of airborne contamination. The spray cabinets are also fairly well enclosed and can be hooked up to forced exhaust systems. Additionally, the coating we are using is self priming so that when spray hits the targeted surface, it will stay where it is applied. While this message does not directly answer your question, I hope it adds insight. I hope that others on the Technet can contribute something better from actual experience. I look forward to hearing from them. ---------- From: [log in to unmask] To: [log in to unmask] Subject: ASSY: SR Conformal Coating in Mfg Area Date: Tue, Feb 11, 1997 3:10PM I sent this up to the server last week, but can't find that I ever got a "come-back" copy, so here goes again. Following is posted for one of our clients: "I have a vendor that has installed a closed system conformal coat spray machine in the middle of an area where surface mount and through hole processing occurs. The coating being used is silicone based. I'm concerned about silicone contamination of other materials in the work area, due to unintentional migration (overspray in the atmosphere, fumes/gasses from curing process, etc.) over time, that could affect the soldering processes. Are there any specifications or guidelines for SR coating controls in a printed circuit board assembly house? Is this a valid concern? Does anyone have a good or bad history of a similar situation?" Thanks for inputs anyone has. Jack ***ALL NEW EMPF PHONE NUMBERS*** Jack Crawford, HelpLine Coordinator Electronics Mfg. Productivity Facility ****NEW--317.655.3688 ****FAX 317-655-3699 714 N Senate Ave, Suite 100 Indianapolis IN 46202-3112 VISIT OUR HOME PAGE AT: http://www.empf.org [log in to unmask] ************************************************************************ *** * 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. * ************************************************************************ *** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ************************************************************************ *** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************