Check out http://www.eosesd.org .They have a temporary page right now but once it is up again it has good information on the subject. Also, ATT has a text out that takes a reasonable position on ESD control. As I recall: up to 1MegOhm per square is considered conductive, between 1 Meg and 100 Meg is considered Dissipative, above 100 is considered insulative. The measurement methods are a little involved. A simple DMM will not due. Anyway, my opinion is that you want the floor to be between 1 and 100 MegOhms per square, when measured with the proper methods. We have mats, waxed floors and paint on cement. Mats are easy to maintain, provide some cushion, but provide only isolated protection. Waxed floors only work well when you can maintain humidity above 45%, but go over 60% and ours will actually absorb enough water to get slippery. Paint on cement is cheap and low maintenance, except in very high traffic areas. Carpet has a high initial cost but is low maintenance and holds up well in high traffic areas, but does not withstand solvents. I understand there are epoxy treatments, I have not experience with them. I understand there are rubber tiles that can be used in conjunction with carpet tiles. I have no experience with them. -----Original Message----- From: Doug [mailto:[log in to unmask]] Sent: Friday, 8 October 1999 17:14 To: [log in to unmask] Subject: [TN] Conductive Floors ... What's the actual resistance of a floor that's considered acceptably "conductive" for an area that will be handling telecommunication boards? I mean, if a customer came into your facility and wanted to measure your floor to have it pass or fail being a suitably "conductive", what resistance would they use for that criteria? A former coworker informed me that my old company is moving to their new building. With the move is the discussion about whether to leave the new area as bare concrete, tile it, or paint it. I'm of the opinion that they can leave it as bare concrete, but that's only my opinion. The old building had conductive tile with copper strips and was extremely expensive but reliable. It also seemed to make the customers feel at ease with something they could see as opposed to bare concrete. I can remember making periodic checks with a surface resistance tester, but for the life of me, I can't remember the limits. Any additional comments or opinions appreciated, since this topic seems to come up here every now and then. Regards, Doug