Several methods and different rouging classes

As the ASME-BPE indicates in its recommendations, there are several methods of cleaning, processes which vary depending on the level of rouging. The association defines three classes of rouging:

Classe I

Rouging is slightly attached to the surface and relatively easy to eliminate. The red surfaces are mainly composed of iron oxides. Low amounts of carbon are present ...

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Stainless steel - Rouging, de-rouging, blacking

|Rouging and stainless steel’s resistance to corrosion

Rouging is recognized by its red-orange colour. It only appears on the internal surfaces of ultra-clean pharmaceutical networks such as water for injection production and distribution networks (WFI) or pure steam networks (PS). It concerns iron oxides which attach themselves in the passive layer by substituting themselves for chromium oxides. Gradually, the stainless steel loses its corrosion resistant properties and iron oxide particles risk spreading into the network.


|Technochim, a world leader in combating rouging

Although procedures for eliminating class I and II rouging are reasonably well under control, it is quite another story for class III rouging. Technochim Pharma has developed an exclusive process based on chemical solutions with very low acid concentrations which does not change the stainless steel’s surface state. In addition, this process only needs a few hours of contact compared to other products offered on the market. Furthermore, the technology perfected by Technochim Pharma enables rouging to be eliminated very efficiently, whether it is class I, II or III.

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