Millipore Testing – Evaluation by Particle Counting

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 …

Tape Test for Cleaning Revisited

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” …

Gravimetric Contaminant Testing Flow Chart

As I was writing the recent post about gravimetric Millipore testing it occurred to me that I was trying to boil a good-sized part of a 180+ page document into 500 or so words.  It also occurred to me that many people don’t have the time for or interest in reading endless pages of specifications …