Both active and inactive cutting oils contain what compound?

Active and inactive cutting oils commonly contain sulfur because it plays a significant role in enhancing lubricant properties. In active cutting oils, sulfur acts as an extreme pressure additive, providing additional lubricity and protection against wear during metal machining processes. It helps to reduce friction and improve tool life by creating a protective film on the cutting tool and workpiece.

Inactive cutting oils also contain sulfur, although in a different context. They may use sulfur for its properties in reducing rust or oxidation, ensuring that the oil remains effective in preserving the metal surfaces when not in active use.

The presence of sulfur in both types of cutting oils highlights its versatility in improving performance, whether actively engaging with the metal during cutting operations or offering protective benefits when the machinery is idle.