Ultrasonics – Introduction

The next series of blogs will explore ultrasonic cleaning in some detail.  Today’s blog is an introduction to the world of ultrasound. The theory of sound was first defined and understood a little over 100 years ago when Lord Rayleigh published The Theory of Sound.  Rayleigh was a Nobel Prize winner and, was also responsible for a number of …

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 …