In the past week or so, I have had several people walk into my office and ask a question that has been popular for as long as I can remember – – “What is the ratio of cross section to depth that defines the cleanability of a blind hole?” As is so often the case in …
We all know that an ounce is a unit of weight, right? There are 16 ounces in a pound, 2,000 pounds in a ton and so on. However, in another convention, there are 8 ounces in a cup, 16 ounces in a pint, 32 ounces in a quart, 128 ounces in gallon, etc. In fact, …
So far, we have recognized pH and specific gravity as ways to determine chemical concentration in cleaning solutions. This blog will explore additional techniques that may also be used for this purpose. Conductivity – Pure water is a poor conductor of electricity. As chemistry is added to water, it’s ability to conduct electricity is increased. …
In order to maintain process consistency in an industrial cleaning process, it is frequently necessary to monitor the concentration of chemistry in a cleaning solution. pH and specific gravity are two common parameters that can be used to determine the concentration of cleaning chemistries in water. This blog explores ways in which pH and specific gravity can …
Titration is a procedure frequently used to measure the chemical concentration in a liquid. The concept is pretty simple. A specific volume of the solution under test is collected and put into a container which is usually an erlenmeyer flask or a beaker. The container can be glass, plastic or another material. Glass is often preferred because …
In a preceeding blog, I mentioned that pH is a logrhythmic function. As such, each increase of one pH unit represents a ten-fold change in the measured characteristic. This alone can lead to considerable confusion. But it gets worse! Concentration – One would think that pH would be directly related to concentration – – meaning …
Let me preface this blog with a disclaimer – – I am not a chemist. My understanding of the subject of pH is only as it relates to industial cleaning, cleaning chemistries and their application. Over the years, I have been associated with many chemists who have been very helpful in their efforts to advance …
By law, there must be a Material Safety Data Sheet for any material used in any process. The law was instituted, basically, because workers were unknowingly coming in contact with materials that were dangerous not only from a physical standpoint (fire, reactivity, explosivity, etc.) but to human health and well-being as well. Many of today’s …
One of the more recent developments in minimizing the water left on a part after rinsing is “slow-pull.” Slow-pull is usually applied as the parts exit the rinse that immediately precedes drying. Instead of removing the parts from the rinse at a rapid rate, usually measured in feet per minute (or even feet per second), they are …
The surface tension of a liquid, as we have discussed earlier, is an important consideration in the selection of cleaning chemistry for a particular application but it also has relevance in several other ways as well. In earlier blogs, I have frequently referred to the importance of surface tension but haven’t really discussed what surface tension …
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