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Pinhole & Porosity
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Pinhole & Porosity
Premature corrosion of a substrate is usually due to a coating failure. A major cause is the presence of flaws in the finished coating.
Elcometer specializes in products designed to identify the location of coating defects after the coating has cured. Rugged, shockproof, and water resistant, the Elcometer range of DE, Pulsed DE, and low voltage Holiday Detectors are designed to meet the most exacting specifications. Ergonomic features and interchangeable probes make Elcometer's range the most versatile in the industry.
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: Un-coated 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.
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Pinhole & Porosity Information
Overview
Premature corrosion of a substrate is usually due to a coating failure. A major cause is the presence of flaws in the finished coating.
Elcometer specializes in products designed to identify the location of coating defects after the coating has cured. Rugged, shockproof, and water resistant, the Elcometer range of DE, Pulsed DE, and low voltage Holiday Detectors are designed to meet the most exacting specifications. Ergonomic features and interchangeable probes make Elcometer's range the most versatile in the industry.
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: Un-coated 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.
