Commercial cleaning is a broad term predominantly used by cleaning companies who earn an income by being contracted by individuals, businesses, or corporations to carry out cleaning jobs in a variety of premises. Cleaning companies can be found in virtually every town and city in the world, with a higher concentration in affluent regions. Typically these companies market their services via a professional sales force, advertising, word of mouth, or websites.

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In a recent blog, I touched on the fact that there is a limit to how long a cleaning solution will continue to produce clean parts as it becomes increasingly contaminated from use.  Chemistry and disposing of spent chemistry are both expensive.  Changing a bath usually results in a gap in production as the tank(s) …

The post Chemistry Life – When to Dump a Tank appeared first on CTG Technical Blog.

When particles are the enemy, my general rule is filter, filter, filter!  The cost of filtration is small compared to the overall benefit even if it is only “insurance.”  There is, of course, the initial cost of installation (filter housings, pumps, plumbing, etc.) but the cost after that is going to be pretty much fixed provided …

The post Filter Smart! appeared first on CTG Technical Blog.

A few years ago I wrote a post about the possible perils of automated valves.  The thrust of the post was that many automated valves rely on significant line pressure to hold the valve tightly closed.  In applications where there is only gravity pressure, as in drain lines for example, valves that are perfectly effective under high …

The post A Drip Under LACK of Pressure – Check Valves appeared first on CTG Technical Blog.

What happens when parts exit the cleaning process dirty?  First of all, PANIC, especially in the case of critical cleaning for optics, semiconductor, disc drive and other industries where particles that can’t even be seen with a microscope render product worthless and unrecoverable!  Then there is the inevitable quest for, “Why this is happening?”  Although this scenario is …

The post Particle Problems – Process or Machine? appeared first on CTG Technical Blog.

The applications for wire seem limitless. Wire is used for electrical conductors as well as in structural applications including suspension bridges and other architectural creations.  There are about 1 ½ miles of wire in a typical car today and often over 150 miles in a jetliner.  A cruise ship?  Somewhere around 3,000 miles!  Wire diameters …

The post Case Study – Wire Cleaning Using Ultrasonics appeared first on CTG Technical Blog.

The cost of acquiring and disposing of cleaning chemistry is usually a major contributor to the overall cost of an industrial or precision cleaning process.  Removing contaminants from cleaning solutions can potentially extend their useful life and reduce overall cleaning costs.  Traditional filters including those of the bag and cartridge variety are commonly used to remove solid (particulate) contaminants …

The post Extending Chemistry Life with Microfiltration and Ultrafiltration appeared first on CTG Technical Blog.

I admit, I stole that title from my grandma Bertha.  But even in this day, the concept is applicable.  Cleaning one thing is one thing, cleaning thousands of things is another.  Let’s think about that. Cleaning, as we have discussed before, really amounts to moving contaminants from the surfaces being cleaned and sequestering them in another …

The post How Many Babies Can You Get Clean in a Tub of Bathwater? appeared first on CTG Technical Blog.

In the blog The Effect of Temperature on Ultrasonics, temperature was identified as a major variable in ultrasonic cleaning due to the impact it has on many physical properties of liquids.  This blog addresses the effect that chemistry has on the physical properties of liquids and the resulting effect on ultrasonics.  Most ultrasonic cleaning utilizes chemistry …

The post The Effect of Chemistry on Ultrasonics appeared first on CTG Technical Blog.

  The blog The Effects of Liquid Properties on Ultrasonic Cleaning discussed what effect(s) liquid properties might have on ultrasonic cleaning effectiveness.  These are summarized here – – Many physical properties are inherent to the liquid.  De-ionized water, for example, due to its very high surface tension and tensile strength (as a result of its lack of impurities) is difficult …

The post The Effect of Temperature on Ultrasonics appeared first on CTG Technical Blog.

The physical properties of liquids have a significant effect on their ability to cavitate and produce imploding cavitation bubbles useful for ultrasonic cleaning.  Since other factors including temperature and chemistry can have an effect on the physical properties of liquids, these, too, play a significant role in ultrasonic cleaning.  This blog explores the effect that a number …

The post The Effects of Liquid Properties on Ultrasonic Cleaning appeared first on CTG Technical Blog.

The notion persists that more power is better in ultrasonic cleaning applications.  In the past, this may have been an absolute as the amount of power available was often limited by the limitations of the equipment that was available.  As we discussed in a recent blog however, today’s ultrasonic equipment is no longer limited in power …

The post Ultrasonic Power vs. Cavitation Density appeared first on CTG Technical Blog.

A previous blog discussed the ramifications of contaminant loading on cleaning.  This time let’s look at the long term effects on cleaning chemistry.  In lab testing, the ability of chemistry to withstand extended use is often not challenged.  Chemistry is prepared and used for short term cleaning trials to verify the cleaning process.  In long …

The post Lab Testing – Chemical Life appeared first on CTG Technical Blog.

The risk of laboratory testing was discussed in the blog Beyond the Cleaning Lab Test Results.  This blog along with others that follow will explore these implications in more detail. In developing a cleaning process in the test lab, a technician usually starts out by cleaning a small number of parts using freshly prepared and uncontaminated …

The post Lab Testing – Contaminant Loading appeared first on CTG Technical Blog.

The cleaning process is the “recipe” for cleaning.  Like any culinary recipe, it should clearly define the ingredients, times, temperatures and the method of application to be used for cleaning.  Most cleaning consists of at least the three basic steps of washing, rinsing and drying. Wash – The purpose of washing is to remove contaminants …

The post Cleaning Process Specification Questions appeared first on CTG Technical Blog.

Immersion or spray methods are used in most industrial cleaning processes.  Both are effective but one may be better suited than the other in some applications and often for reasons that aren’t immediately obvious.   Let’s take a minute to explore some of the benefits and limitations of each. Spray – The most often recognized …

The post Immersion or Spray – – or Both? appeared first on CTG Technical Blog.

OK, I may get into trouble here, but this is a subject that I think needs some discussion.  What about cleaning consultants? I know many people who are cleaning consultants and, in fact, I was one for a while myself.  There are good reasons for hiring a consultant when it comes to the specification of …

The post The Cleaning Consultant appeared first on CTG Technical Blog.

Process testing in a cleaning laboratory is a typical and useful step in the development of an industrial cleaning process.  In most cases, test cleaning is performed in laboratories maintained by the suppliers of cleaning equipment and/or cleaning chemistries.  The goal of lab testing, of course, is to simulate a cleaning process to determine its effectiveness …

The post Beyond the Cleaning Lab Test Results appeared first on CTG Technical Blog.

In ultrasonic cleaners, sound waves (vibration) originating from ultrasonic transducers must be efficiently transmitted into the cleaning liquid where they create cavitation bubbles which implode to enhance cleaning.  The weak links in the path from the transducer to the cavitating liquid are typically the  locations or “interfaces” where vibrations must be transmitted from one vibrating …

The post Maximizing Ultrasonic Energy Transfer appeared first on CTG Technical Blog.

Millipore testing is a very popular method of measuring and verifying part cleanliness.  The procedure is described in the blog Millipore Testing.  Although the procedures for Millipore testing are usually very well written and precise, there is still occasionally reason to question the results.  So how do you make sure that the numbers are good? Since …

The post Millipore Testing – Verification appeared first on CTG Technical Blog.

Ultrasonic power has been a topic of much discussion ever since ultrasonic technology was first used for cleaning nearly a century ago. The quest has always been for more ultrasonic power, the thought being that higher power would produce better cleaning results.  As I have discussed earlier, higher ultrasonic power typically requires an increase in the amplitude …

The post Ultrasonic Power – Reaching the Limits? appeared first on CTG Technical Blog.

Ultrasonic cleaning is widely used for removing particles from surfaces.  It is generally agreed that the high energy of implosions of cavitation bubbles break the bonds holding particles to the surface being cleaned and that liquid motion (streaming) carries the particles away once they have been dislodged.  However, it is also well known that ultrasonic cavitation …

The post Questioning Particle Generation Due to Cavitation Erosion as a Source of Contamination appeared first on CTG Technical Blog.