# 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 …

# Ultrasonic Power – Reaching the Limits?

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 …

# Questioning Particle Generation Due to Cavitation Erosion as a Source of Contamination

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 …

# Conductivity Calculations

Previous blogs have talked about heat conductivity in very general terms to produce a foundation for this somewhat more technical view for those of you who like formulas and numbers. Conductive heat transfer can be expressed with “Fourier’s Law” q = k A dT / s where q = heat transfer (W, J/s, Btu/hr) A …

# Heat Conductivity and Convection

Heat conductivity is a measure of the ability of a material to transfer heat within itself.  For example, if you heat one end of a short piece of copper wire, the heat is quickly distributed throughout the wire by conduction.  This can be easily demonstrated using a short piece (1 to 2 inches) of heavy gage …

# Heat – Definitions and Concepts

Temperature has been identified as one of the important variables in cleaning – arguably the most important.  So I thought it might be worth some time to develop a little understanding of heat – – especially how it is generated and transmitted. Heat is a form of energy.  The amount of heat contained in an object …

# Exhausting Gasses Produced by the Cleaning Process

In many industrial cleaning processes it is necessary to exhaust emissions that unavoidably result from the cleaning process.  The reasons for exhaust can take on a large range – Remove heat that would otherwise raise the temperature in the cleaning area Remove humidity that would otherwise raise the humidity in the cleaning area Remove toxic fumes that might otherwise be dangerous …

# How do you measure surface tension?

In the world of industrial cleaning technology we talk about surface tension a lot! So much so, in fact, that it is hard to enter into any discussion of cleaning without having the subject of surface tension arise.  In cleaning chemistry, for example, we are always looking for lower surface tension to promote penetration of small surface features …

# Surface Tension and/or Wettability

A few days ago, I sat down to write what I thought would be a simple explanation of surface tension and how it is measured in the laboratory (a blog which will be published shortly if I can figure all of this out).  In doing the normal background research, however, I started to see contradictions …

# Reliability of Plumbing Fittings – Threaded vs. Compression

Wherever there are liquids there are leaks – it’s inevitable.  Leaks, of course cost money in downtime and repair of industrial cleaning systems.  So, you ask, what is the best defense against leaks. Most leaks occur where one piece of plumbing connects with another.  A pipe to a valve, unions, connections to pumps and filters and …