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Semi-synthetic fluid is a type of lubricant which is generally insoluble in water.(a) True(b) FalseThis question was posed to me during a job interview.Question is from Friction and Lubrication in Metal Forming topic in chapter Types of Die & Metal Forming Processes of Casting-Forming-Welding II

Answer» RIGHT answer is (b) False

The best I can explain: Lubricant is a material that is mainly used for reducing friction and for cooling purposes. For example, oils, SOLUBLE oils, synthetic and semi-synthetic fluids are widely used in metal forming processes. Semi-synthetic fluid is a kind of lubricant which easily mixed with water to form a fine lubricant because it includes small quantity of MINERAL oil, usually LESS than 30% of the total concentrate volume.


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