Re-cleaning Medical Device Vendor Parts
Q. Current procedure calls for an ultrasonic bath at 69C for 20 mins with Liquinox® and DI water. Then calls for another such DI bath at 69C with NO detergent for 20 mins. Then a 1 min DI water flushing. Is Liquinox appropriate? When I clean the parts, they have already been cleaned by vendor in the exact same manner, essentially I re-clean them. Is this overkill?
Cleaners for Water Labs w/ Heavy Metals
What cleaner can water labs that need to work in the ppb or ppt for heavy metals use? The key is both a proper, free-rinsing, critical cleaning detergent and proper rinsing/drying.
Ultrasonic Cleaning of Optical Devices
Q. Ultrasonic and forced DI water are not removing particles from the optical devices. We suspect that the particles are charged and that is playing a role in the difficulty of removing them. Rusting isn’t a problem but oxidation might be. Al, Ti are metals in the devices we use. The cleaning is followed by chemical etching so this can be an issue.
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Improving DI Water Wettability
Q. We are looking for a low concentration surfactant to improve DI water wetting to polycarbonate and stainless steel during an aerated flushing operation for removal of sub-micron surface particles. Our parts are cleaned before assembly – we need to improve a DI-water flushing operation that is meant to remove sub-micron sized surface particulate from inside an assembled gas path (tube). How can we improve wettability of DI water?
Comparing powder and liquid detergents
Q. We frequently use 55-gal drums of Liquinox to remediate gasoline contaminated soil and groundwater. We are not cleaning lab glassware. We inject it into the groundwater at hazardous waste sites to solubilize the globules of gasoline or other contaminants trapped in the porous spaces of the soil. I would like to know if it is cheaper to buy the powdered Alconox and dissolve it? Is there an equivalent unit of measure to evaluate the two?
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