Why calcium sulfonate greases resist rust and washout in Nordic use

Grease trivia: calcium sulfonate complex thickeners don’t just hold oil—they also act as built‑in rust inhibitors. The thickener uses overbased calcium salts to neutralize acidic contaminants and keep a protective film even when water is present, useful with salted slush or coastal spray. The same principle applies to Calcium Sulfonate Complex EP2 on pins and bearings.