Porosity Test on coated surface
Porosity Coatings applied can have irregularities due to different circumstances. Surface uncleanness, paint differences and dust or air bubbles enclosed also causes pinholes, thin spots, cracks etc. To prevent an early breakdown of the coating system causing corrosion underneath.
Porosity Test Process
Porosity test must be made to find the weak spots. Action can be taken before problems occur over time. Available on both High Voltage Holiday Detectors & Low Votage Pinhole Detector. The Instruments provide an accurate way for locating faults in non-conductive coatings and linings. Detection of pinholes, flaws, inclusions, thin spots and bubbles in a coating.
High voltage porosity testing of coatings
A High Voltage Holiday Detector is specifically designed to revolutionize high voltage DC testing of coatings, making it safer, easier and more reliable than previously possible. The gauge can only be used to find flaws in coatings whose substrate is made from a conductive material (metal, concrete etc.). The units have variable sensitivity and are fitted with audible and visual fault alarms either.
The high voltage technique can be used to test coatings up to 36 mm thick. This method is ideal for inspecting paint on pipelines, tank bottoms and other protective coatings. Coatings on concrete can also be tested using this method.
Low Porosity Detector
Another test system should be used when the high voltage testing is not desirable due to thin coating thicknesses up to 500 micron. For these a Low Voltage Pinhole Detector is used with select-able voltages of 9, 67.5 and 90 volts. Depending on the coating thickness under test. Use 9 volt for coatings up to 300 micron, 67.5 volt for coatings up to 400 micron and 90 volt for coatings until 500 micron.
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