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Industrial and environmental inspection, vendor inspection, technical assistance, non-destructive testing (NDT) and technical staffing for all type of industries.
Multidisciplinary laboratories.Testing and engineering for product development. Conformity testing and product certification. SYSTEMS CERTIFICATION.
Statutory vehicle inspection services and emission & gas testing solutions worldwide.
Design, engineering, testing and homologation services for the automotive industry worldwide.
Liquid penetrant testing (LPT), which is also known as dye-penetrant inspection, liquid penetrant inspection or penetrant testing, can be carried out using either visible or fluorescent dye penetrant. It is one of the oldest methods of non-destructive testing still in use today because of its simplicity and remarkable sensitivity to locating very fine surface discontinuities. LPT involves applying a coloured penetrating liquid to the surface of the material being tested. The liquid is drawn into defective areas in the material’s surface through capillary action and then drawn out to reveal itself to detection using UV lights or other methods, depending upon the type of penetrant and dye colouring used. Fluorescent dye penetrant is typically green and uses a white developer to draw the dye back to the surface from inside the discontinuities by 'wicking' or capillary action. The fluorescent penetrant is characterised by its ability to emit visible radiation when excited by UV-A light and may be used on a variety of materials. Fluorescent penetrant is typically more sensitive than visible dye and is ranked into 4 levels of sensitivity. It does, however, require special lighting conditions: crews must have UV-A lamps, blackout shades and power generators in the field. Fluorescent-dye testing is easily performed under laboratory conditions.