What is soluble oil primarily made of?

Soluble oil is primarily made of lubricant-based oil, emulsifiers, and additives. This composition is crucial for its functionality in metalworking processes. The lubricant-based oil serves to reduce friction and wear during machining operations, while emulsifiers help to blend the oil with water to create a stable and effective coolant. The presence of additives enhances properties such as corrosion resistance, lubrication effectiveness, and foam control.

The other options do not accurately represent the composition of soluble oil. While water and emulsifiers are essential, they alone do not capture the complete formulation, which also includes lubricant-based oil. Additionally, soluble oil is not purely made from water or only lubricant without additives, as these would limit its performance capabilities in various cutting and machining tasks. The balance of these components makes soluble oil an effective coolant and lubricant in metal cutting applications.