Millipore Testing – Verification

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 …

Cleaning Sintered or Porous Parts

Most surfaces that we encounter in industrial cleaning are relatively smooth and contiguous.  We have talked earlier about the difficulties of cleaning blind holes, threads, capillary spaces and other challenging configurations. The one surface we haven’t yet explored is that of a material that is itself porous.  Sintered materials including metal, ceramic, glass, plastic and …

Cleanliness Testing – White Glove and Swab Tests

I have spent considerable time on the blog disclosing and discussing a variety of cleanliness testing methods.  A couple of tests that escaped earlier discussion, however, are the “white glove” test and the closely-related “swab” test.  These tests are conducted by rubbing or wiping a surface using a white (usually cotton) glove or a cotton …

Metrology – Standards

Metrology, simply, is the science of measuring things.  Metrology is used extensively in the world of industrial cleaning to both control and quantify cleaning processes.  Finding the right equipment and procedures to produce accurate and meaningful results is often a challenge for those without extensive knowledge of the science.  The upcoming blogs on metrology are …

Reader Questions – Baskets for Ultrasonic Cleaning

Before we get to today’s topic, we have an announcement!  Many of you may have recently subscribed for email updates of the blog either on your own or as a result of emails sent out by the Cleaning Technologies Group.  The names of those of you who did were entered into a drawing for an ipad (wish I could …

Is It Clean – Particles – Particles Resulting from Metal Finishing

There are a number of metal finishing process which should be avoided in the manufacture of items subject to demanding specifications with regard to the presence of particles.  These common processes, although employed with the best intent, result in the generation or unavoidable entrapment of particles which may be released under use conditions with potentially …

Is It Clean – Particles – Particle Generating Substrates

Some substrate materials are inherent particle generators and may never be cleaned to the point of there being no particles present.  With these materials, particles are a way of life and can not be avoided.  This, of course, makes cleanliness testing using particle analysis a difficult if not impossible task.  The difficulty is exacerbated by …

Is It Clean? – Particles – Exceptional Particles – Magnetism

Before we leave the subject of particles and particle counting, there are some things we need to touch on regarding “exceptional” particles.  In an earlier blog,  Particles That Don’t Count?, we discussed briefly some particles that may or may not count when it comes to analyzing the cleanliness of a part.  These and several other kinds of …

Is It Clean? – Particles – Liquid Particle Counting

In recent blogs we have been talking, for the most part, about particles that are relatively large – ones you can see, touch and feel.  There is a world out there, however, that worries about particles that are very tiny.  I’m talking about particles that are smaller than tens of microns in dimension.  An earlier …