When it comes to evaluating particle residues remaining on parts after manufacturing, the “go to” is often particle counting. Particles remaining on parts after normal manufacturing operations are collected using a secondary, more aggressive washing method. Collected particles are then tallied by size, number and, in some cases, type and probable origin as a measure …
In a very early blog written in 2011 I talked about the “Scotch” tape test for cleanliness. At that time I did not address quantification of the results other than as a visual assessment. In addition to evaluating general cleanliness, this technique is being found particularly applicable when determining the cleanliness of substrates that “shed” …
Millipore testing is all about evaluating cleanliness based on the presence of particles or other solid, non-soluble contaminants. In general, it can not be used to detect the presence of hydrocarbons or other contaminants which will be solubilized in the extraction process. The results of Millipore testing are generally expressed by weight using gravimetric analysis …
It would make sense that variations in the aluminum foil used for testing in the foil test for ultrasonic performance could have a bearing on the outcome of the test. Most people use standard “grocery store” aluminum foil for testing because it is inexpensive and widely available. So let’s talk about that first. The most …
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 …
Liquid level sensors are used to indicate liquid level by sensing the presence of a liquid using several different means. The “float” type sensor is the one that probably comes to mind first for most of us. The float valve in a toilet tank is a prime example. In the case of the toilet, a …
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 …
Drying is the last and often a critical part of a cleaning process. In many cases it is also the most time and energy consuming. It is often the most difficult part of the process to specify and control. Although there are several drying technologies available, blowing with hot air is simple and by far …
With its well-deserved credentials for chemical resistance and durability, stainless steel and particularly 316 grade stainless steel is a “go to” for the fabrication of ultrasonic cleaning tanks. Although it performs well in most applications, there are still those where stainless steel has its limitations. Stainless steel achieves its “stainless” characteristic by developing a very …
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