What does R1 mean in the sealing surface RF-R1?
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What does R1 mean in the sealing surface RF-R1? It’s usually written as RF; I don’t know how an R1 came to be added.
It might be a typo; the EU has levels B1 and B2, with different roughness levels.
It shouldn’t be a typo; it appears in many places. It’s a diagram produced by an Italian company.
It’s possible that Italian standards have specific regulations; you might want to look for the original version. But in any case, the basics remain the same – it’s likely that there are some regulations regarding surface roughness