Passi Test Plus

Passi Test Plus is a tool designed to assess the real quality of stainless steel. It consists of a “probe pen”, which contains the electrochemical solution, and an external storage unit. By pressing the probe pen on the surface, Passi Test Plus measures and stores data on the open-circuit potential and nobility of a metal, thus measuring its corrosion resistance.

The test, which is neither destructive nor damaging, is fast (the result is given in 15 seconds) and numerical: while other, purely chemical passivation tests are based on colour interpretation (ferrocyanide test), thus offering a strongly subjective datum that is often distorted by superficial impurities, Passi Test Plus releases an exact and not disputable numerical value.

The Passi Test Plus system is calibrated with zero as its discriminating point: if the value is higher than zero, then the stainless steel is passivated; if the value is lower than zero, then passivation is either scarce or non-existent. As such, it is possible to compare different kinds of stainless steel: the higher than zero is the value, the better the passivation of the sample; the lower than zero is the value, the worse is the passivation of the tested stainless steel.

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