As I was writing the recent post about gravimetric Millipore testing it occurred to me that I was trying to boil a good-sized part of a 180+ page document into 500 or so words. It also occurred to me that many people don’t have the time for or interest in reading endless pages of specifications …
“Millipore” testing evaluates cleanliness by extracting particulate contamination from a surface and then either weighing or counting and quantifying the collected particles to assess the cleanliness achieved by a prior cleaning means. The first step in either case is to collect and prepare for analysis any particulate residue remaining on the surface after pervious cleaning. …
I just spent a couple of hours re-reading several of the ISO specifications related to “Millipore” testing including ISO16232-3 and -7. I put the word Millipore in quotes here because although these are normally called Millipore specifications, none of them mentions the word Millipore. (Millipore happens to be the name of a company that developed …
Task At Hand – In a previous blog I declared that I am not a fan of the aluminum foil test for evaluating ultrasonic performance. I question its validity and relevance on a number of fronts. If my purpose here is to question my own skepticism, then I guess I should probably define the factors …
Until recently, I was only able to theorize about the mechanism involved in the perforation of aluminum foil by ultrasonic cavitation. I no longer have to theorize! My theory had always been that perforation of aluminum foil was due to the repeated flexing of aluminum foil as cavitation implosions occurring on opposite sides of the foil …
If you’ve heard of ultrasonic cleaning you’ve probably heard of the aluminum foil test. The practice of putting a piece of aluminum foil into an ultrasonically activated tank of water probably began as a novelty demonstration. The holes produced in the aluminum foil by the collapse of cavitation bubbles at least showed that something interesting …
Using the right amount of chemistry is important to successful industrial cleaning. Since there is no standard convention for expressing the amount of chemistry to use, it sometimes takes a little effort to sort things out. Chemistry is supplied in either liquid or powder form with several different conventions for each. Let’s look at liquids …
Today’s industrial parts cleaning processes commonly employ at least three distinct steps. The basic steps are Washing, Rinsing, and Drying. Each step is custom tailored to the overall requirement with the range of options for each much broader than one not intimately involved with the technology might imagine. In some processes, in fact, it is …
I will be the first person to advocate cleaning trials in the laboratory as an important step in the development of a cleaning process. I will also be the first to admit that in over fifty years of lab testing I have made (and hopefully learned from) more than a few mistakes made in the …
One of the first steps in the development of any cleaning process is to define and understand the contaminant or “dirt” that needs to be removed. Sounds simple, right? Not so fast! Dirt comes in all varieties and styles. Different kinds of dirt require different cleaning processes. Some dirt is liquid. Oils, coolants, paint, adhesives, …
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