Steve, I looked into this back in 2006. Bivar wouldn't tell me the chemical makeup of their Diss-o-pads. So we did not go there. Besides they add another labor step to install each one. When we need to raise a part above the board (typically power resistors and high voltage diodes) we use pieces of G-10 (FR-4) that were snap-off rails from circuit boards added together if needed for different heights. Place them under the component and then top solder (yes, I know that is bad practice). Slide out the FR-4 and we are done. But keep in mind this is my opinion with no scientific evidence to back it up. I didn't want to take any chances of messing up my Carbon and Resin beds at $600 per change out. Phil Nutting -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Monday, April 29, 2013 2:56 PM To: [log in to unmask] Subject: [TN] Bivar Diss-O-Pads and closed-loop DI systems Hi All, We're getting ready to change our cleaner out with a closed-loop system, and I was wondering if the use of Bivar Diss-O-Pads will harm the DI beds? I have a call into Bivar, but I thought I would ask TechNet while I was waiting. I know I'm going to have to change the water soluble mask that is currently used to one that doesn't harm the DI beds, but I don't know about the Diss-O-Pads... Steve Gregory ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________