Ardrox NDT chemistry, stocked in Namibia

Three aerosols, three steps. First the red dye penetrant (Ardrox 996PB) is sprayed on the cleaned metal and given time to seep into any surface-breaking crack. Then the excess is wiped and flushed off with the remover (Ardrox 9PR5) — the dye stays only inside defects. Finally the white developer (Ardrox 9D1B) is sprayed on; it acts as blotting paper, drawing dye out of cracks as vivid red lines against the white background. A crack invisible to the naked eye becomes a line you can photograph for the inspection report.

All three working aerosols together — penetrant (996PB), remover (9PR5) and developer (9D1B) — because the method only works as a set: a workshop holding two of the three cannot certify anything. That trio sits on the standing orders of Namibian transport workshops, mines, fishing-fleet workshops and fire brigades alike; anyone who welds, repairs lifting equipment or certifies hooks and shackles needs it. Cernol stocks all three in Windhoek, so an inspection scheduled for Friday does not depend on a courier from Johannesburg.

Yes — penetrant testing only finds what it can reach, so the surface must be clean, dry and free of paint, scale, oil and smeared metal. Degrease first (Solvene 33 or MPC Degreaser, fully evaporated), remove scale or old paint mechanically or with Magnus 645 on ferrous work, and let everything dry — moisture in a crack blocks the penetrant. Rough grinding can smear metal over fine cracks, so finish critical surfaces appropriately before testing. The few minutes of preparation are the difference between a real inspection and a false “all clear”.

Ardrox is one of the internationally recognised names in aviation NDT and surface treatment, and its penetrant systems are widely specified in aerospace maintenance. Namibian aviation operations, airport fire services and MRO workshops use the same 996PB / 9PR5 / 9D1B system supplied through Cernol. For a specific approval reference (OEM manual, AMS spec), ask us and we will confirm the exact document for the product batch supplied.