Reducing can be done with extreme pressure lubricants at speeds over 7,000 FPM. There are many mills that run at very low speeds when reducing expensive alloys such as beryllium, copper, tantalum, and gold and use little or no lubricant or coolant. Many lubricants are good for extreme pressure, but they can also act as a coolant. Water is still considered one of the greatest liquid coolants. An extreme pressure lubricant mixed with water makes a good lubricant.