In a message dated 7/8/99 10:53:34 AM US Eastern Standard Time, [log in to unmask] writes: << Can anyone tell me what the industry std/limit is for micro grammes of NaCl per sq cm found after ionic testing? I have a value under 5 and have a set fail limit of 20ug. This is after a 20 min test. >> While the limit is fairly well documented in several standards, the test duration is not. Over several years of work on ionic contamination testing, this was a major point of frustration for me. Both the test duration and fluid temperature should be included in the test specification. Obviously the results are different for a 1 minute test with room temperature fluid vs. a 20 minute test with heated fluid. Jon Moore Z-Tech Services