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Rusty Grinder Burrs
Commercial grade steel burrs are made from high-carbon steel, NOT stainless steel as is often mis-stated. Carbon steel will rust if exposed to even slight humidity if not “seasoned” or protected with some sort of oil/lubricant. Rust is virtually non existent in coffee grinders that have had a few pounds of coffee put through them, even after periods of non-use. This is a result of “seasoning of the burrs” similar to cast iron cookware.
Read the entire explanation at Baratza:
https://www.baratza.com/rusty-burrs-really/
We sell replacement burrs for Baratza, Mahlkonig, Compak, Rancilio, Fiorenzato Lelit, Macap and you may notice some rust stains.
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