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lubricant is wiped or squeegeeed from the surface. This method is effective at removal of foating lubricants and work best if the cleaning tank is recirculated to a holding weir where the lubricant can concentrate to maximize contact with the skimmer. The second method is somewhat more expensive and involves a coalescing device that pumps the cleaner from the tank and through the coalescer, then returns it back to the cleaning tank. This method works using plates and/or plastic media that provide high surface area and artifcially increase the quiescent time, enabling the lubricant to better split out from the cleaner. The last and most expensive method is microfltration. This utilizes polymeric or ceramic fltration membranes that have a nominal porosity of approximately 1-10 microns. This porosity size is effective at removing free and emulsifed lubricants from the cleaning solution. This method is generally used with one of the previous ones to remove the higher percentage of lubricant, enabling it to be more effective. n Service Temp for mil c5541 coaTingS Q. What is the approximate service temperature range for chemical conversion coatings (Chem Film MILC-5541 Type I or II)? R.L. a. The MIL C5541 coatings are basically chromate conversion coatings for aluminum alloys. If used bare (without any additional coating), there is a fairly low temperature limitation for the coating. The environment it is in also will affect the maximum temperature. For instance, the chromate conversion coating will start to dehydrate at about 140��F in a drying oven. A shortterm exposure in the range of 140 to 200��F may be acceptable, although extended times in this temperature range will dehydrate it, causing a ���mudcracking��� affect that will degrade its corrosion resistance. Longer times in a more saturated environment will be more tolerable for the coating, enabling it to operate in a slightly higher temperature range or for a longer period of time. Force cure coatings applied over chromate conversation coatings can withstand higher temperatures with dehydration, through. n LearnMORE Dig Deeper Searching for in-depth analysis of a cleaning or pretreatment process? Look no further than PF���s Research and White Paper Zone, an entire section of our site dedicated to free papers and presentations from leading researchers in the finishing industry. Visit pfonline.com/zones/technology. AirlessTm Vacuum Solvent Cleaning ��� ��� ��� ��� ��� ��� ��� ��� ��� ��� ��� ��� ��� VacuumTechnologyForUltra-LowEmissions Consistent&RepeatableCleaning; Precision&IndustrialCleaningApplications; Multi-SolventCapabilities SmallToLargeCleaningChambers Standard&CustomModels; InexpensiveToOperate&EasyToMaintain; MinimalEnvironmentalImpact OperatorFriendly Programmable&FlexibleCleaningCycles; EPA/SCAQMDApproved AskUsAboutOurContractCleaningServices Built,Supported&ServicedInTheUSA;! Precision & industrial cleaning systems C O R P O R AT I O N 342 Compass Circle Unit A2, North Kingstown RI 02852 401-667-7370 http://www.serec-corp.com sales@serec-corp.com pfonline.com 47