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Matt Fajt

surface soluble salt

Surface Soluble Salt Testing – The Latest in Extraction and Analysis Procedures

Introduction Chemical contaminants on a surface can include chloride, ferrous ions, sulfates and nitrates, among others. These chemicals or “salts” are deposited onto surfaces while the structure is in service, or during transportation of new steel to the fabrication shop. They are soluble in water, so they can typically be removed from surfaces by pressure …

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sling psychrometer

The Psychrometer Duel: Old School vs. New School

Why do we need to measure ambient conditions? Ambient conditions are the prevailing conditions of air temperature, the moisture content of the air (relative humidity), and the temperature at which condensation will occur (dew point).  Most coating specifications have set requirements for monitoring and documenting results for surface and air temperature, relative humidity and dew …

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calibration verification

Calibration, Verification of Accuracy and Adjustment… Synonyms or Differences in Terminology?

“Do I have to maintain inspection gage calibration and certification?  Why don’t they retain their calibration over time? Do I need to verify gage accuracy on a regular basis? How often? What is the difference between calibration and verification of accuracy?” These are common questions in the coatings industry.  A simple answer is that without …

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