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Pinhole & Porosity
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Premature corrosion of a substrate is usually due to a coating failure. A major cause is the presence of flaws in the finished coating. Collectively referred to as porosity, the main types of flaws are:

Runs & Sags: Coatings move under gravity leaving a thin dry film.

Cissing: When a coating does not re-flow to cover the voids generated by air bubbles being released from the surface of a coating.

Cratering: If the substrate is wet or the coating has poor flow characteristics, voids are created in the coating.

Pinholes: Caused by air entrapment which is then released from the surface, or by the entrapment of particulates (dust, sand etc.) which do not stay in place.

Over Coating: If too much coating is applied, as it cures internal stresses of the coating can cause it to crack.

Under Coating: Uncoated areas, or where the coating flows away from edges or corners of a substrate or welds. Insufficient coating over a rough surface profile may also leave the peaks of the profile exposed.

Elcometer 270 Pinhole Detector

The Elcometer 270 range utilises the wet sponge technique and has been designed to set a new standard for wet sponge pinhole detectors - a h...

Elcometer 270 Pinhole Detector Inspector

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Elcometer 236 DC Holiday Detector

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The Elcometer 280 is a ‘stick type’ holiday detector which has been designed to make pulsed DC high voltage holiday detection safer, easier ...
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